Retry, backoff and default Generate timeout (#48)

Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>
Co-committed-by: dev_agent <dev_agent@cubecraftlabs.com>

cmd/server/boot_test.go

@@ -330,3 +330,41 @@ func TestSeedSettingsAtBoot(t *testing.T) {
 		t.Errorf("timezone after reboot = %q, want America/Denver", got.Timezone)
 	}
 }
+
+func TestSeedDefaultsAtBoot(t *testing.T) {
+	ctx := context.Background()
+	db, err := openStore(ctx, t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := db.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	if err := seedDefaults(ctx, db, "America/Denver"); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := household.NewSettingsService(db).Get(ctx); err != nil {
+		t.Errorf("household settings: %v", err)
+	}
+	var provider string
+	if err := db.Reader.QueryRowContext(ctx, `SELECT provider FROM ai_settings`).Scan(&provider); err != nil {
+		t.Errorf("AI settings: %v", err)
+	} else if provider != household.SeedAIProvider {
+		t.Errorf("AI provider = %q, want %q", provider, household.SeedAIProvider)
+	}
+	var prefs int
+	if err := db.Reader.QueryRowContext(ctx, `SELECT count(*) FROM notification_prefs`).Scan(&prefs); err != nil {
+		t.Fatal(err)
+	}
+	if prefs != 5 {
+		t.Errorf("%d notification preferences, want 5", prefs)
+	}
+
+	// A second boot seeds nothing new and succeeds.
+	if err := seedDefaults(ctx, db, ""); err != nil {
+		t.Fatalf("reboot: %v", err)
+	}
+}

cmd/server/jobs_test.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"context"
+	"io"
+	"log/slog"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+)
+
+// TestNewJobRunnerRunsNoop proves the runner run builds can execute a job:
+// a noop job enqueued before Start, as at boot, succeeds with its result.
+func TestNewJobRunnerRunsNoop(t *testing.T) {
+	ctx := context.Background()
+	db, err := openStore(ctx, t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := db.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	runner, kinds, err := newJobRunner(db, slog.New(slog.NewTextHandler(io.Discard, nil)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	id, err := kinds.builtins.Noop.Enqueue(ctx, jobs.NoopPayload{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	jobsCtx, stopJobs := context.WithCancel(ctx)
+	if err := runner.Start(jobsCtx); err != nil {
+		stopJobs()
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		stopJobs()
+		runner.Wait()
+	})
+
+	deadline := time.Now().Add(5 * time.Second)
+	for {
+		job, err := runner.Get(ctx, id)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if job.Status == jobs.StatusSucceeded || job.Status == jobs.StatusFailed {
+			if job.Kind != jobs.KindNoop || job.Status != jobs.StatusSucceeded || string(job.Result) != `{"ok":true}` || job.Error != nil {
+				t.Fatalf("noop job = %+v (result %s), want succeeded with {\"ok\":true}", job, job.Result)
+			}
+			return
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("noop job never finished; last %+v", job)
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+}

cmd/server/main.go

@@ -18,6 +18,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/forwarded"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/frontend"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/secretbox"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/server"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
@@ -27,6 +28,9 @@ import (
 // version is set at build time with -ldflags "-X main.version=<version>".
 var version = "dev"
 
+// jobWorkers is the number of background jobs run at once.
+const jobWorkers = 2
+
 func main() {
 	cfg, err := config.Load()
 	if err != nil {
@@ -59,10 +63,14 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		}
 	}()
 
-	if err := seedSettings(ctx, db, cfg.DefaultTZ); err != nil {
+	if err := seedDefaults(ctx, db, cfg.DefaultTZ); err != nil {
 		return err
 	}
 	settings := household.NewSettingsService(db)
+	runner, _, err := newJobRunner(db, logger)
+	if err != nil {
+		return err
+	}
 
 	sessions, err := auth.NewSessionManager(db, cfg.SessionIdle, cfg.SessionMax)
 	if err != nil {
@@ -80,10 +88,22 @@ func run(cfg config.Config, logger *slog.Logger) error {
 		return err
 	}
 
-	router, err := server.NewRouter(logger, version, cfg.TrustedProxy, authFlow, sessions, settings, frontend.Assets())
+	router, err := server.NewRouter(logger, version, cfg.TrustedProxy, authFlow, sessions, settings, runner, frontend.Assets())
 	if err != nil {
 		return err
 	}
+
+	// Start fails the jobs a previous process left running before any
+	// worker runs. The workers stop, and are waited for, before the
+	// database closes.
+	jobsCtx, stopJobs := context.WithCancel(ctx)
+	defer func() {
+		stopJobs()
+		runner.Wait()
+	}()
+	if err := runner.Start(jobsCtx); err != nil {
+		return err
+	}
 	srv := &http.Server{
 		Addr:              cfg.HTTPAddr,
 		Handler:           router,
@@ -153,6 +173,47 @@ func seedSettings(ctx context.Context, db *store.Store, defaultTZ string) error
 	return err
 }
 
+// seedDefaults creates the household settings, AI settings and notification
+// preferences that do not exist yet. Existing rows are never changed.
+func seedDefaults(ctx context.Context, db *store.Store, defaultTZ string) error {
+	if err := seedSettings(ctx, db, defaultTZ); err != nil {
+		return err
+	}
+	if err := household.SeedAISettings(ctx, db); err != nil {
+		return err
+	}
+	return household.SeedNotificationPrefs(ctx, db)
+}
+
+// jobKinds enqueues every job kind the server runs.
+type jobKinds struct {
+	builtins *jobs.Builtins
+}
+
+// newJobRunner returns the job runner with every job kind registered, ready
+// to Start.
+func newJobRunner(db *store.Store, logger *slog.Logger) (*jobs.Runner, *jobKinds, error) {
+	runner, err := jobs.NewRunner(db, logger, jobWorkers)
+	if err != nil {
+		return nil, nil, err
+	}
+	kinds, err := registerJobKinds(runner)
+	if err != nil {
+		return nil, nil, err
+	}
+	return runner, kinds, nil
+}
+
+// registerJobKinds registers every job kind's handler on runner. Each
+// feature's job kinds are registered here.
+func registerJobKinds(runner *jobs.Runner) (*jobKinds, error) {
+	builtins, err := jobs.RegisterBuiltins(runner)
+	if err != nil {
+		return nil, err
+	}
+	return &jobKinds{builtins: builtins}, nil
+}
+
 // logListening logs the startup line. Only the public URL's origin is logged
 // so no credential-bearing URL component can reach the log.
 func logListening(logger *slog.Logger, cfg config.Config) {

internal/ai/llm/anthropic/anthropic.go

@@ -0,0 +1,560 @@
+// Package anthropic is the llm.Provider adapter for Anthropic's Messages
+// API. It calls POST {base}/v1/messages and GET {base}/v1/models over plain
+// net/http.
+//
+// The adapter never logs, and no error it returns contains the API key:
+// errors do not quote caller- or vendor-supplied text, and every exported
+// method passes its error through redact as a backstop.
+package anthropic
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"net/http"
+	"net/url"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// APIVersion is the Messages API version sent as the anthropic-version
+// header.
+const APIVersion = "2023-06-01"
+
+// Config configures a Provider.
+type Config struct {
+	// BaseURL is the API root the /v1 endpoint paths are appended to, e.g.
+	// "https://api.anthropic.com".
+	BaseURL string
+	// APIKey is sent as the x-api-key header. It must not be empty.
+	APIKey string
+	// Model is the model Generate requests. ListModels and Verify do not
+	// need it.
+	Model string
+	// MaxTokens is the max_tokens Generate sends when a Request sets none:
+	// the Messages API requires one. It must be positive.
+	MaxTokens int
+}
+
+// Provider is an Anthropic Messages API llm.Provider.
+type Provider struct {
+	base      string
+	apiKey    string
+	model     string
+	maxTokens int
+	client    *http.Client
+}
+
+var _ llm.Provider = (*Provider)(nil)
+
+// New validates cfg and returns a Provider.
+func New(cfg Config) (*Provider, error) {
+	p, err := newFromConfig(cfg)
+	if err != nil {
+		return nil, redact(err, cfg.APIKey)
+	}
+	return p, nil
+}
+
+func newFromConfig(cfg Config) (*Provider, error) {
+	// No error from New quotes caller-supplied text: any of it may equal or
+	// contain the API key. Base URL errors never echo the URL.
+	u, err := url.Parse(cfg.BaseURL)
+	if err != nil {
+		return nil, errors.New("anthropic: base URL does not parse")
+	}
+	if (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
+		return nil, errors.New("anthropic: base URL must be an absolute http or https URL")
+	}
+	// A trailing "?" or "#" parses to an empty query or fragment, yet the
+	// endpoint path appended to it would land in the query or fragment.
+	if u.User != nil || strings.ContainsAny(cfg.BaseURL, "?#") {
+		return nil, errors.New("anthropic: base URL must not carry credentials, a query or a fragment")
+	}
+	if cfg.APIKey == "" {
+		return nil, errors.New("anthropic: no API key configured")
+	}
+	if !validHeaderValue(cfg.APIKey) {
+		return nil, errors.New("anthropic: API key has a control character")
+	}
+	if cfg.MaxTokens <= 0 {
+		return nil, errors.New("anthropic: max tokens must be positive")
+	}
+	return &Provider{
+		base:      strings.TrimRight(cfg.BaseURL, "/"),
+		apiKey:    cfg.APIKey,
+		model:     cfg.Model,
+		maxTokens: cfg.MaxTokens,
+		client:    noRedirectClient(),
+	}, nil
+}
+
+// validHeaderValue reports whether value is an RFC 9110 field-value: no
+// control characters other than horizontal tab, so no CR, LF or DEL.
+func validHeaderValue(value string) bool {
+	for i := 0; i < len(value); i++ {
+		if c := value[i]; (c < 0x20 && c != '\t') || c == 0x7f {
+			return false
+		}
+	}
+	return true
+}
+
+// toolName is the pattern the Messages API requires of a tool name.
+var toolName = regexp.MustCompile(`^[a-zA-Z0-9_-]{1,64}$`)
+
+// maxResponseBody caps a successful response body; a larger one is an error.
+const maxResponseBody = 16 << 20
+
+// maxErrorBody caps how much of an error response body is read. It is far
+// above llm.MaxBodyExcerpt, so redaction still sees every secret that could
+// reach the excerpt.
+const maxErrorBody = 64 << 10
+
+type message struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type tool struct {
+	Name        string          `json:"name"`
+	InputSchema json.RawMessage `json:"input_schema"`
+}
+
+type toolChoice struct {
+	Type string `json:"type"`
+	Name string `json:"name"`
+}
+
+type messagesRequest struct {
+	Model       string      `json:"model"`
+	MaxTokens   int         `json:"max_tokens"`
+	System      string      `json:"system,omitempty"`
+	Messages    []message   `json:"messages"`
+	Temperature *float64    `json:"temperature,omitempty"`
+	Tools       []tool      `json:"tools,omitempty"`
+	ToolChoice  *toolChoice `json:"tool_choice,omitempty"`
+}
+
+type messagesResponse struct {
+	Type    string `json:"type"`
+	Model   string `json:"model"`
+	Content []struct {
+		Type  string          `json:"type"`
+		Text  string          `json:"text"`
+		Name  string          `json:"name"`
+		Input json.RawMessage `json:"input"`
+	} `json:"content"`
+	StopReason string `json:"stop_reason"`
+	Usage      struct {
+		InputTokens  int `json:"input_tokens"`
+		OutputTokens int `json:"output_tokens"`
+	} `json:"usage"`
+}
+
+// Generate sends req to {base}/v1/messages. A Request with a Schema is sent
+// as one tool whose input_schema is the schema, with tool_choice forcing
+// it; Response.JSON is then that tool's input.
+func (p *Provider) Generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	resp, err := p.generate(ctx, req)
+	return resp, redact(err, p.apiKey)
+}
+
+func (p *Provider) generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	if err := req.Validate(); err != nil {
+		return llm.Response{}, fmt.Errorf("anthropic: generate: %w", err)
+	}
+	if p.model == "" {
+		return llm.Response{}, errors.New("anthropic: generate: no model configured")
+	}
+	body := messagesRequest{
+		Model:       p.model,
+		MaxTokens:   p.maxTokens,
+		System:      req.System,
+		Temperature: req.Temperature,
+	}
+	if req.MaxTokens > 0 {
+		body.MaxTokens = req.MaxTokens
+	}
+	if req.Schema != nil {
+		if !toolName.MatchString(req.Schema.Name) {
+			return llm.Response{}, errors.New("anthropic: generate: schema name is not a valid tool name")
+		}
+		body.Tools = []tool{{Name: req.Schema.Name, InputSchema: req.Schema.Schema}}
+		body.ToolChoice = &toolChoice{Type: "tool", Name: req.Schema.Name}
+	}
+	for _, m := range req.Messages {
+		body.Messages = append(body.Messages, message{Role: string(m.Role), Content: m.Content})
+	}
+	payload, err := json.Marshal(body)
+	if err != nil {
+		return llm.Response{}, fmt.Errorf("anthropic: generate: encode request: %w", err)
+	}
+
+	if req.Timeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(ctx, req.Timeout)
+		defer cancel()
+	}
+	raw, err := p.do(ctx, http.MethodPost, "/v1/messages", payload)
+	if err != nil {
+		return llm.Response{}, fmt.Errorf("anthropic: generate: %w", err)
+	}
+
+	var mr messagesResponse
+	if err := json.Unmarshal(raw, &mr); err != nil {
+		return llm.Response{}, fmt.Errorf("anthropic: generate: decode response: %w", err)
+	}
+	if mr.Type != "message" {
+		return llm.Response{}, errors.New("anthropic: generate: response is not a message")
+	}
+	resp := llm.Response{
+		Usage:        llm.Usage{InputTokens: mr.Usage.InputTokens, OutputTokens: mr.Usage.OutputTokens},
+		Model:        mr.Model,
+		FinishReason: mr.StopReason,
+	}
+	var text strings.Builder
+	for _, block := range mr.Content {
+		switch block.Type {
+		case "text":
+			text.WriteString(block.Text)
+		case "tool_use":
+			if req.Schema != nil && block.Name == req.Schema.Name && resp.JSON == nil {
+				resp.JSON = block.Input
+			}
+		}
+	}
+	resp.Text = text.String()
+	if req.Schema == nil {
+		return resp, nil
+	}
+	if !isJSONObject(resp.JSON) {
+		resp.JSON = nil
+		return resp, fmt.Errorf("anthropic: generate: reply holds no input for the forced tool: %w", llm.ErrBadOutput)
+	}
+	return resp, nil
+}
+
+// isJSONObject reports whether raw is exactly one JSON object.
+func isJSONObject(raw json.RawMessage) bool {
+	s := bytes.TrimSpace(raw)
+	return bytes.HasPrefix(s, []byte("{")) && json.Valid(s)
+}
+
+type modelsResponse struct {
+	Data []struct {
+		ID          string `json:"id"`
+		DisplayName string `json:"display_name"`
+	} `json:"data"`
+	HasMore bool   `json:"has_more"`
+	LastID  string `json:"last_id"`
+}
+
+// modelsPageLimit is the largest page GET /v1/models serves.
+const modelsPageLimit = 1000
+
+// ListModels returns every model {base}/v1/models lists, following pages.
+func (p *Provider) ListModels(ctx context.Context) ([]llm.Model, error) {
+	models, err := p.listModels(ctx)
+	return models, redact(err, p.apiKey)
+}
+
+func (p *Provider) listModels(ctx context.Context) ([]llm.Model, error) {
+	models := []llm.Model{}
+	after := ""
+	for {
+		page, err := p.modelsPage(ctx, modelsPageLimit, after)
+		if err != nil {
+			return nil, fmt.Errorf("anthropic: list models: %w", err)
+		}
+		for _, m := range page.Data {
+			if m.ID == "" {
+				return nil, fmt.Errorf("anthropic: list models: model %d has no id", len(models))
+			}
+			name := m.DisplayName
+			if name == "" {
+				name = m.ID
+			}
+			models = append(models, llm.Model{ID: m.ID, DisplayName: name})
+		}
+		if !page.HasMore {
+			return models, nil
+		}
+		if page.LastID == "" || page.LastID == after {
+			return nil, errors.New("anthropic: list models: response has more pages but no new cursor")
+		}
+		after = page.LastID
+	}
+}
+
+// modelsPage fetches one page of GET {base}/v1/models.
+func (p *Provider) modelsPage(ctx context.Context, limit int, after string) (modelsResponse, error) {
+	q := url.Values{"limit": {strconv.Itoa(limit)}}
+	if after != "" {
+		q.Set("after_id", after)
+	}
+	raw, err := p.do(ctx, http.MethodGet, "/v1/models?"+q.Encode(), nil)
+	if err != nil {
+		return modelsResponse{}, err
+	}
+	var mr modelsResponse
+	if err := json.Unmarshal(raw, &mr); err != nil {
+		return modelsResponse{}, fmt.Errorf("decode response: %w", err)
+	}
+	if mr.Data == nil {
+		return modelsResponse{}, errors.New("response has no data list")
+	}
+	return mr, nil
+}
+
+// Verify checks the credentials with the cheapest authenticated call: one
+// page of GET {base}/v1/models holding at most one model.
+func (p *Provider) Verify(ctx context.Context) error {
+	_, err := p.modelsPage(ctx, 1, "")
+	if err != nil {
+		err = fmt.Errorf("anthropic: verify: %w", err)
+	}
+	return redact(err, p.apiKey)
+}
+
+// do sends one request and returns the body of a 2xx response. Any other
+// status becomes the matching llm typed error.
+func (p *Provider) do(ctx context.Context, method, path string, payload []byte) ([]byte, error) {
+	var reqBody io.Reader
+	if payload != nil {
+		reqBody = bytes.NewReader(payload)
+	}
+	httpReq, err := http.NewRequestWithContext(ctx, method, p.base+path, reqBody)
+	if err != nil {
+		// The parse error names the URL, whose path may hold the API key.
+		return nil, errors.New("build request: request URL is invalid")
+	}
+	httpReq.Header.Set("x-api-key", p.apiKey)
+	httpReq.Header.Set("anthropic-version", APIVersion)
+	httpReq.Header.Set("Accept", "application/json")
+	if payload != nil {
+		httpReq.Header.Set("Content-Type", "application/json")
+	}
+
+	httpResp, err := p.client.Do(httpReq)
+	if err != nil {
+		return nil, p.transportError(err)
+	}
+	defer httpResp.Body.Close()
+
+	if httpResp.StatusCode < 200 || httpResp.StatusCode > 299 {
+		body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxErrorBody))
+		if err != nil {
+			return nil, p.transportError(err)
+		}
+		return nil, p.statusError(httpResp, body)
+	}
+	body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxResponseBody+1))
+	if err != nil {
+		return nil, p.transportError(err)
+	}
+	if len(body) > maxResponseBody {
+		return nil, fmt.Errorf("response body exceeds %d bytes", maxResponseBody)
+	}
+	return body, nil
+}
+
+// statusOverloaded is the status the Messages API returns when it is
+// temporarily overloaded.
+const statusOverloaded = 529
+
+// statusError maps a non-2xx response to an llm typed error.
+func (p *Provider) statusError(resp *http.Response, body []byte) error {
+	switch resp.StatusCode {
+	case http.StatusUnauthorized, http.StatusForbidden:
+		return fmt.Errorf("HTTP %d: %w", resp.StatusCode, llm.ErrAuth)
+	case http.StatusTooManyRequests, statusOverloaded:
+		return llm.NewRateLimitedError(retryAfter(resp.Header.Get("Retry-After"), time.Now()), p.apiKey)
+	case http.StatusRequestTimeout:
+		return llm.NewTimeoutStatusError(resp.StatusCode, p.apiKey)
+	default:
+		return llm.NewProviderError(resp.StatusCode, body, p.apiKey)
+	}
+}
+
+// retryAfter parses a Retry-After header, in delay-seconds or HTTP-date
+// form. A missing, malformed or past value means the vendor gave no usable
+// wait, reported as 0.
+func retryAfter(value string, now time.Time) time.Duration {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return 0
+	}
+	if secs, err := strconv.ParseInt(value, 10, 64); err == nil || errors.Is(err, strconv.ErrRange) {
+		if secs < 0 {
+			return 0
+		}
+		// time.Duration counts nanoseconds in an int64; a larger wait is
+		// capped to the most whole seconds it holds instead of overflowing.
+		if secs > maxRetryAfterSeconds {
+			secs = maxRetryAfterSeconds
+		}
+		return time.Duration(secs) * time.Second
+	}
+	if at, err := http.ParseTime(value); err == nil && at.After(now) {
+		return at.Sub(now).Round(time.Second)
+	}
+	return 0
+}
+
+// maxRetryAfterSeconds is the largest delay-seconds value retryAfter
+// returns unchanged: the most whole seconds a time.Duration holds.
+const maxRetryAfterSeconds = math.MaxInt64 / int64(time.Second)
+
+// noRedirectClient returns an HTTP client that never follows a redirect.
+// A followed redirect would resend the credential headers, which net/http
+// strips only for its own list of sensitive headers and only across hosts;
+// instead the 3xx response is returned and becomes a provider error.
+func noRedirectClient() *http.Client {
+	return &http.Client{
+		CheckRedirect: func(*http.Request, []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+}
+
+func isTimeout(err error) bool {
+	var ne net.Error
+	return errors.Is(err, context.DeadlineExceeded) || (errors.As(err, &ne) && ne.Timeout())
+}
+
+// transportFailure is a failed HTTP exchange. It carries the cause's text
+// with the request URL removed and the API key redacted, and unwraps only to
+// the cause's category: llm.ErrTimeout, context.Canceled or nothing.
+type transportFailure struct {
+	text string
+	kind error
+}
+
+func (e *transportFailure) Error() string { return e.text }
+
+// GoString keeps %#v to the redacted Error text instead of the fields.
+func (e *transportFailure) GoString() string { return e.text }
+
+func (e *transportFailure) Unwrap() error { return e.kind }
+
+// transportError reports a failure to complete the HTTP exchange. A
+// *url.Error names the request URL, and a base URL path may hold the API
+// key, so only the wrapped cause is kept, rendered with the key redacted.
+func (p *Provider) transportError(err error) error {
+	var kind error
+	switch {
+	case isTimeout(err):
+		kind = llm.ErrTimeout
+	case errors.Is(err, context.Canceled):
+		kind = context.Canceled
+	}
+	var ue *url.Error
+	if errors.As(err, &ue) {
+		err = ue.Err
+	}
+	text := "transport: " + err.Error()
+	if kind == llm.ErrTimeout {
+		text = fmt.Sprintf("%s: %s", llm.ErrTimeout, text)
+	}
+	return &transportFailure{text: llm.Redact(text, p.apiKey), kind: kind}
+}
+
+// redactedError stands in for one layer of an error chain that holds the
+// API key. Its text is the layer's text with the key redacted, and Unwrap
+// returns the layer's causes passed through redact, so no error reached by
+// unwrapping has text holding the key. Is consults the original layer and
+// its chain, so sentinels still match. As does too. The llm typed errors
+// remove the key from their own complete text, fixed words included, so
+// they always match; As refuses a match whose text, or whose %#v form,
+// holds the key, so it never hands back an error that can print it.
+type redactedError struct {
+	text string
+	err  error
+	key  string
+}
+
+func (e *redactedError) Error() string { return e.text }
+
+// GoString keeps %#v from printing the fields, which hold the key.
+func (e *redactedError) GoString() string { return e.text }
+
+func (e *redactedError) Unwrap() error { return redact(errors.Unwrap(e.err), e.key) }
+
+func (e *redactedError) Is(target error) bool { return errors.Is(e.err, target) }
+
+func (e *redactedError) As(target any) bool {
+	if !errors.As(e.err, target) {
+		return false
+	}
+	found := reflect.ValueOf(target).Elem()
+	matched, isErr := found.Interface().(error)
+	if (isErr && holdsKey(matched, e.key)) || strings.Contains(fmt.Sprintf("%#v", found.Interface()), e.key) {
+		found.SetZero()
+		return false
+	}
+	return true
+}
+
+// redactedJoin is redactedError for a layer with several causes, such as
+// one built by errors.Join or by fmt.Errorf with more than one %w.
+type redactedJoin struct {
+	redactedError
+}
+
+func (e *redactedJoin) Unwrap() []error {
+	causes := e.err.(interface{ Unwrap() []error }).Unwrap()
+	safe := make([]error, len(causes))
+	for i, c := range causes {
+		safe[i] = redact(c, e.key)
+	}
+	return safe
+}
+
+// redact is the backstop every exported method applies to its error: with
+// a non-empty key, it returns a stand-in whose text, and the text of every
+// error it unwraps to, has the key redacted. Every non-nil err is wrapped,
+// even one whose text lacks the key, because %#v of an unwrapped error
+// prints its struct field names, and a key may spell one.
+func redact(err error, key string) error {
+	if err == nil || key == "" {
+		return err
+	}
+	re := redactedError{text: llm.Redact(err.Error(), key), err: err, key: key}
+	if _, ok := err.(interface{ Unwrap() []error }); ok {
+		return &redactedJoin{re}
+	}
+	return &re
+}
+
+// holdsKey reports whether the text of err or of any error in its chain
+// contains key.
+func holdsKey(err error, key string) bool {
+	if err == nil {
+		return false
+	}
+	if strings.Contains(err.Error(), key) {
+		return true
+	}
+	switch u := err.(type) {
+	case interface{ Unwrap() error }:
+		return holdsKey(u.Unwrap(), key)
+	case interface{ Unwrap() []error }:
+		for _, c := range u.Unwrap() {
+			if holdsKey(c, key) {
+				return true
+			}
+		}
+	}
+	return false
+}

internal/ai/llm/anthropic/testdata/README.md

@@ -0,0 +1,41 @@
+# Anthropic adapter fixtures
+
+These are the Messages API response bodies the contract tests in
+`anthropic_test.go` replay. They are **not live captures**. Product AI is
+tested with fakes, and live vendor calls are opt-in and never use
+credentials, so no request was sent to Anthropic to make them. Each fixture
+is a sanitized adaptation of the response shapes in Anthropic's public API
+documentation:
+
+- Messages: <https://docs.anthropic.com/en/api/messages>
+- Tool use, including `tool_choice` `{type: tool}`:
+  <https://docs.anthropic.com/en/docs/build-with-claude/tool-use>
+- List models: <https://docs.anthropic.com/en/api/models-list>
+- Errors: <https://docs.anthropic.com/en/api/errors>
+
+Sanitizing:
+
+- IDs, request IDs, timestamps and token counts are illustrative values in
+  the documented format, not values from a real account.
+- Message content and tool input are replaced with MealQuest dinner text.
+- No real credential appears anywhere. `{{KEY}}` is a placeholder the tests
+  replace with a fake key, to prove the adapter redacts a key echoed back in
+  a vendor body.
+
+Below, *not in the public example* marks fields or values that were added
+for a test case and do not come from the documented example.
+
+| Fixture | Shape | Not in the public example |
+| --- | --- | --- |
+| `messages_tool_use.json` | Message with one `tool_use` block, `stop_reason: tool_use`, `usage` with cache fields. | The tool name and input. |
+| `messages_text.json` | Message with `text` blocks, `stop_reason: end_turn`. | A second text block, to test joining. |
+| `messages_max_tokens.json` | Message with a `text` block, `stop_reason: max_tokens`. | — |
+| `models_page1.json` | Models list page: `data`, `has_more: true`, `first_id`, `last_id`. | — |
+| `models_page2.json` | Last models list page, `has_more: false`. | The second model has no `display_name`, to test the fallback to `id`. |
+| `error_authentication.json` | Error, `authentication_error` (401). | The `{{KEY}}` text; added to test redaction. |
+| `error_permission.json` | Error, `permission_error` (403). | — |
+| `error_rate_limit.json` | Error, `rate_limit_error` (429). | The `{{KEY}}` text; added to test redaction. |
+| `error_overloaded.json` | Error, `overloaded_error` (529). | — |
+| `error_not_found.json` | Error, `not_found_error` (404). | — |
+| `error_invalid_request.json` | Error, `invalid_request_error` (400). | — |
+| `error_api.json` | Error, `api_error` (500). | The `x-api-key: {{KEY}}` text; added to test redaction. |

internal/ai/llm/anthropic/testdata/error_api.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "api_error", "message": "An unexpected error has occurred internal to Anthropic's systems. x-api-key: {{KEY}}"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7G4"}

internal/ai/llm/anthropic/testdata/error_authentication.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "authentication_error", "message": "invalid x-api-key: {{KEY}}"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7Fy"}

internal/ai/llm/anthropic/testdata/error_invalid_request.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "invalid_request_error", "message": "max_tokens: Field required"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7G3"}

internal/ai/llm/anthropic/testdata/error_not_found.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "not_found_error", "message": "model: claude-nonexistent"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7G2"}

internal/ai/llm/anthropic/testdata/error_overloaded.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "overloaded_error", "message": "Overloaded"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7G1"}

internal/ai/llm/anthropic/testdata/error_permission.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "permission_error", "message": "Your API key does not have permission to use the specified resource."}, "request_id": "req_011CSHoEeqs5C35K2UUqR7Fz"}

internal/ai/llm/anthropic/testdata/error_rate_limit.json

@@ -0,0 +1 @@
+{"type": "error", "error": {"type": "rate_limit_error", "message": "Number of request tokens has exceeded your per-minute rate limit for key {{KEY}}"}, "request_id": "req_011CSHoEeqs5C35K2UUqR7G0"}

internal/ai/llm/anthropic/testdata/messages_max_tokens.json

@@ -0,0 +1,12 @@
+{
+  "id": "msg_01XFDUDYJgAACzvnptvVoYEL",
+  "type": "message",
+  "role": "assistant",
+  "model": "claude-sonnet-5",
+  "content": [
+    {"type": "text", "text": "Here are some Side quests for Our kitchen"}
+  ],
+  "stop_reason": "max_tokens",
+  "stop_sequence": null,
+  "usage": {"input_tokens": 472, "output_tokens": 400}
+}

internal/ai/llm/anthropic/testdata/messages_text.json

@@ -0,0 +1,18 @@
+{
+  "id": "msg_013Zva2CMHLNnXjNJJKqJ2EF",
+  "type": "message",
+  "role": "assistant",
+  "model": "claude-sonnet-5",
+  "content": [
+    {"type": "text", "text": "Try a crock pot chili: "},
+    {"type": "text", "text": "it is a Quick dinner."}
+  ],
+  "stop_reason": "end_turn",
+  "stop_sequence": null,
+  "usage": {
+    "input_tokens": 2095,
+    "cache_creation_input_tokens": 0,
+    "cache_read_input_tokens": 0,
+    "output_tokens": 503
+  }
+}

internal/ai/llm/anthropic/testdata/messages_tool_use.json

@@ -0,0 +1,22 @@
+{
+  "id": "msg_01Aq9w938a90dw8q",
+  "type": "message",
+  "role": "assistant",
+  "model": "claude-sonnet-5",
+  "content": [
+    {
+      "type": "tool_use",
+      "id": "toolu_01A09q90qw90lq917835lq9",
+      "name": "side_quests",
+      "input": {"dinners": [{"name": "Sheet-pan gnocchi", "why": "Like your Regular tray bake, but quicker."}]}
+    }
+  ],
+  "stop_reason": "tool_use",
+  "stop_sequence": null,
+  "usage": {
+    "input_tokens": 472,
+    "cache_creation_input_tokens": 0,
+    "cache_read_input_tokens": 0,
+    "output_tokens": 61
+  }
+}

internal/ai/llm/anthropic/testdata/models_page1.json

@@ -0,0 +1,13 @@
+{
+  "data": [
+    {
+      "type": "model",
+      "id": "claude-sonnet-5",
+      "display_name": "Claude Sonnet 5",
+      "created_at": "2026-02-24T00:00:00Z"
+    }
+  ],
+  "has_more": true,
+  "first_id": "claude-sonnet-5",
+  "last_id": "claude-sonnet-5"
+}

internal/ai/llm/anthropic/testdata/models_page2.json

@@ -0,0 +1,18 @@
+{
+  "data": [
+    {
+      "type": "model",
+      "id": "claude-haiku-4-5-20251001",
+      "display_name": "Claude Haiku 4.5",
+      "created_at": "2025-10-01T00:00:00Z"
+    },
+    {
+      "type": "model",
+      "id": "claude-opus-5-5",
+      "created_at": "2026-05-01T00:00:00Z"
+    }
+  ],
+  "has_more": false,
+  "first_id": "claude-haiku-4-5-20251001",
+  "last_id": "claude-opus-5-5"
+}

internal/ai/llm/errors.go

@@ -0,0 +1,168 @@
+package llm
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+	"unicode/utf8"
+)
+
+var (
+	// ErrAuth means the vendor rejected the credentials.
+	ErrAuth = errors.New("llm: authentication failed")
+	// ErrRateLimited means the vendor throttled the request. The concrete
+	// error is a *RateLimitedError carrying the requested wait.
+	ErrRateLimited = errors.New("llm: rate limited")
+	// ErrTimeout means the request did not finish within its timeout.
+	ErrTimeout = errors.New("llm: request timed out")
+	// ErrBadOutput means the model replied but the reply is unusable, e.g.
+	// structured output that does not parse.
+	ErrBadOutput = errors.New("llm: unusable model output")
+	// ErrProvider means the vendor returned an unexpected HTTP status. The
+	// concrete error is a *ProviderError carrying the status and a redacted
+	// body excerpt.
+	ErrProvider = errors.New("llm: provider error")
+)
+
+// RateLimitedError is a throttled request. It matches ErrRateLimited.
+// Adapters build it with NewRateLimitedError so its text never holds their
+// credential.
+type RateLimitedError struct {
+	// RetryAfter is how long the vendor asked callers to wait; 0 means it
+	// did not say.
+	RetryAfter time.Duration
+	// text is the redacted Error text set by NewRateLimitedError; "" means
+	// the error was built without a credential.
+	text string
+}
+
+// NewRateLimitedError returns the error for a throttled request. secret is
+// the credential sent with the request, or "" when the request sent none.
+// Every occurrence of a non-empty secret is removed from the error text
+// when it is built, even where the fixed text happens to spell it, and the
+// secret itself is not kept.
+func NewRateLimitedError(retryAfter time.Duration, secret string) *RateLimitedError {
+	e := &RateLimitedError{RetryAfter: retryAfter}
+	e.text = Redact(e.Error(), secret)
+	return e
+}
+
+func (e *RateLimitedError) Error() string {
+	if e.text != "" {
+		return e.text
+	}
+	if e.RetryAfter == 0 {
+		return ErrRateLimited.Error()
+	}
+	return fmt.Sprintf("%s: retry after %v", ErrRateLimited, e.RetryAfter)
+}
+
+// GoString keeps %#v to the redacted Error text instead of the fields.
+func (e *RateLimitedError) GoString() string { return e.Error() }
+
+// Is reports whether target is ErrRateLimited.
+func (e *RateLimitedError) Is(target error) bool { return target == ErrRateLimited }
+
+// MaxBodyExcerpt is the longest response-body excerpt, in bytes, a
+// ProviderError keeps.
+const MaxBodyExcerpt = 512
+
+// redactionMarker replaces each secret in redacted text, unless the marker
+// would itself hold the secret.
+const redactionMarker = "[REDACTED]"
+
+// Redact returns s with every occurrence of a non-empty secret removed. Each
+// occurrence becomes "[REDACTED]" when the result then holds no secret;
+// otherwise, because the marker contains the secret or joins with its
+// neighbours to form it, occurrences are deleted until none remains. The
+// result never contains secret.
+func Redact(s, secret string) string {
+	if secret == "" {
+		return s
+	}
+	if out := strings.ReplaceAll(s, secret, redactionMarker); !strings.Contains(out, secret) {
+		return out
+	}
+	for strings.Contains(s, secret) {
+		s = strings.ReplaceAll(s, secret, "")
+	}
+	return s
+}
+
+// ProviderError is an unexpected HTTP status from the vendor. It matches
+// ErrProvider. Build it with NewProviderError, which redacts the body.
+type ProviderError struct {
+	status int
+	body   string
+	text   string
+}
+
+// NewProviderError returns the error for an unexpected HTTP status. It
+// always keeps a body excerpt of at most MaxBodyExcerpt bytes. secret is the
+// credential sent with the request, or "" when the request sent none; every
+// occurrence of a non-empty secret in body is removed by Redact before the
+// body is cut, so no part of it survives, and again after the cut, so the
+// truncation mark cannot complete it. It is removed from the complete error
+// text too, even where the fixed text happens to spell it, and the secret
+// itself is not kept.
+func NewProviderError(status int, body []byte, secret string) *ProviderError {
+	s := strings.TrimSpace(Redact(string(body), secret))
+	if len(s) > MaxBodyExcerpt {
+		cut := MaxBodyExcerpt
+		for cut > 0 && !utf8.RuneStart(s[cut]) {
+			cut--
+		}
+		s = Redact(s[:cut]+"…", secret)
+	}
+	text := fmt.Sprintf("%s: HTTP %d", ErrProvider, status)
+	if s != "" {
+		text += ": " + s
+	}
+	return &ProviderError{status: status, body: s, text: Redact(text, secret)}
+}
+
+// Status returns the HTTP status code.
+func (e *ProviderError) Status() int { return e.status }
+
+// Body returns the redacted, truncated response-body excerpt; it is empty
+// when the vendor sent no body.
+func (e *ProviderError) Body() string { return e.body }
+
+func (e *ProviderError) Error() string { return e.text }
+
+// GoString keeps %#v to the redacted Error text instead of the fields,
+// whose names could spell the credential.
+func (e *ProviderError) GoString() string { return e.text }
+
+// Is reports whether target is ErrProvider.
+func (e *ProviderError) Is(target error) bool { return target == ErrProvider }
+
+// TimeoutStatusError is an HTTP status, such as 408, by which the vendor
+// said the request timed out. It matches ErrTimeout, and Status keeps it
+// apart from a transport timeout, so a caller can tell the vendor answered.
+// Build it with NewTimeoutStatusError, which redacts its text.
+type TimeoutStatusError struct {
+	status int
+	text   string
+}
+
+// NewTimeoutStatusError returns the error for a timeout HTTP status.
+// secret is the credential sent with the request, or "" when the request
+// sent none; every occurrence of a non-empty secret is removed from the
+// error text, and the secret itself is not kept.
+func NewTimeoutStatusError(status int, secret string) *TimeoutStatusError {
+	text := fmt.Sprintf("HTTP %d: %s", status, ErrTimeout)
+	return &TimeoutStatusError{status: status, text: Redact(text, secret)}
+}
+
+// Status returns the HTTP status code.
+func (e *TimeoutStatusError) Status() int { return e.status }
+
+func (e *TimeoutStatusError) Error() string { return e.text }
+
+// GoString keeps %#v to the redacted Error text instead of the fields.
+func (e *TimeoutStatusError) GoString() string { return e.text }
+
+// Unwrap returns ErrTimeout.
+func (e *TimeoutStatusError) Unwrap() error { return ErrTimeout }

internal/ai/llm/errors_test.go

@@ -0,0 +1,212 @@
+package llm
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestSentinelErrorsMatchWhenWrapped(t *testing.T) {
+	for _, sentinel := range []error{ErrAuth, ErrTimeout, ErrBadOutput} {
+		wrapped := fmt.Errorf("openai: generate: %w", sentinel)
+		if !errors.Is(wrapped, sentinel) {
+			t.Errorf("errors.Is(%v, %v) = false", wrapped, sentinel)
+		}
+		for _, other := range []error{ErrAuth, ErrTimeout, ErrBadOutput, ErrRateLimited, ErrProvider} {
+			if other != sentinel && errors.Is(wrapped, other) {
+				t.Errorf("errors.Is(%v, %v) = true", wrapped, other)
+			}
+		}
+	}
+}
+
+func TestRateLimitedError(t *testing.T) {
+	err := fmt.Errorf("anthropic: %w", &RateLimitedError{RetryAfter: 30 * time.Second})
+	if !errors.Is(err, ErrRateLimited) {
+		t.Fatal("errors.Is(err, ErrRateLimited) = false")
+	}
+	if errors.Is(err, ErrProvider) || errors.Is(err, ErrAuth) {
+		t.Fatal("rate-limited error matches an unrelated sentinel")
+	}
+	var rl *RateLimitedError
+	if !errors.As(err, &rl) {
+		t.Fatal("errors.As(err, *RateLimitedError) = false")
+	}
+	if rl.RetryAfter != 30*time.Second {
+		t.Fatalf("RetryAfter = %v, want 30s", rl.RetryAfter)
+	}
+	if got := err.Error(); got != "anthropic: llm: rate limited: retry after 30s" {
+		t.Fatalf("Error() = %q", got)
+	}
+	if got := (&RateLimitedError{}).Error(); got != "llm: rate limited" {
+		t.Fatalf("Error() without RetryAfter = %q", got)
+	}
+}
+
+func TestProviderError(t *testing.T) {
+	err := fmt.Errorf("gemini: %w", NewProviderError(503, []byte(` {"error":"overloaded"} `), "sk-test"))
+	if !errors.Is(err, ErrProvider) {
+		t.Fatal("errors.Is(err, ErrProvider) = false")
+	}
+	if errors.Is(err, ErrRateLimited) || errors.Is(err, ErrAuth) {
+		t.Fatal("provider error matches an unrelated sentinel")
+	}
+	var pe *ProviderError
+	if !errors.As(err, &pe) {
+		t.Fatal("errors.As(err, *ProviderError) = false")
+	}
+	if pe.Status() != 503 || pe.Body() != `{"error":"overloaded"}` {
+		t.Fatalf("Status, Body = %d, %q", pe.Status(), pe.Body())
+	}
+	if got := err.Error(); got != `gemini: llm: provider error: HTTP 503: {"error":"overloaded"}` {
+		t.Fatalf("Error() = %q", got)
+	}
+	if got := NewProviderError(500, nil, "sk-test").Error(); got != "llm: provider error: HTTP 500" {
+		t.Fatalf("Error() without body = %q", got)
+	}
+}
+
+func TestProviderErrorRedactsSecrets(t *testing.T) {
+	const key = "sk-live-0123456789abcdef"
+	body := []byte(`{"error":"invalid key sk-live-0123456789abcdef","echo":"Bearer sk-live-0123456789abcdef"}`)
+	pe := NewProviderError(400, body, key)
+	for _, s := range []string{pe.Error(), pe.Body()} {
+		if strings.Contains(s, key) {
+			t.Fatalf("secret leaked: %q", s)
+		}
+	}
+	want := `{"error":"invalid key [REDACTED]","echo":"Bearer [REDACTED]"}`
+	if pe.Body() != want {
+		t.Fatalf("Body() = %q, want %q", pe.Body(), want)
+	}
+}
+
+func TestProviderErrorRedactsBeforeTruncating(t *testing.T) {
+	const key = "sk-secret-straddling-the-cut"
+	// The key starts just before the excerpt limit, so truncating first
+	// would leave its prefix in the excerpt.
+	body := strings.Repeat("x", MaxBodyExcerpt-5) + key
+	pe := NewProviderError(500, []byte(body), key)
+	if strings.Contains(pe.Body(), "sk-se") {
+		t.Fatalf("secret prefix leaked: %q", pe.Body())
+	}
+}
+
+func TestProviderErrorTruncatesOnRuneBoundary(t *testing.T) {
+	body := strings.Repeat("a", MaxBodyExcerpt-1) + "é" + strings.Repeat("b", 100)
+	pe := NewProviderError(500, []byte(body), "sk-test")
+	want := strings.Repeat("a", MaxBodyExcerpt-1) + "…"
+	if pe.Body() != want {
+		t.Fatalf("Body() has %d bytes, want %d", len(pe.Body()), len(want))
+	}
+}
+
+func TestProviderErrorKeepsBoundedBodyWithoutSecret(t *testing.T) {
+	body := []byte(` {"error":"model \"llama9\" not found"} `)
+	pe := NewProviderError(404, body, "")
+	if pe.Body() != `{"error":"model \"llama9\" not found"}` {
+		t.Fatalf("Body() = %q", pe.Body())
+	}
+	if got := pe.Error(); got != `llm: provider error: HTTP 404: {"error":"model \"llama9\" not found"}` {
+		t.Fatalf("Error() = %q", got)
+	}
+	long := NewProviderError(500, []byte(strings.Repeat("x", 4*MaxBodyExcerpt)), "")
+	if want := strings.Repeat("x", MaxBodyExcerpt) + "…"; long.Body() != want {
+		t.Fatalf("Body() has %d bytes, want %d", len(long.Body()), len(want))
+	}
+}
+
+func TestRedactNeverLeavesSecret(t *testing.T) {
+	cases := []struct{ s, secret, want string }{
+		{"key sk-1 and Bearer sk-1", "sk-1", "key [REDACTED] and Bearer [REDACTED]"},
+		{"no secret here", "sk-1", "no secret here"},
+		{"x", "", "x"},
+		// The marker holds the secret, so occurrences are deleted.
+		{"rejected REDACTED", "REDACTED", "rejected "},
+		{"A then A", "A", " then "},
+		// The marker joins with a neighbour to form the secret.
+		{"]]aa", "]a", ""},
+		// The marker holds the secret and deleting once leaves a new one.
+		{"DDAA", "DA", ""},
+		{"aabb", "ab", "a[REDACTED]b"},
+	}
+	for _, c := range cases {
+		if got := Redact(c.s, c.secret); got != c.want {
+			t.Errorf("Redact(%q, %q) = %q, want %q", c.s, c.secret, got, c.want)
+		}
+	}
+}
+
+func TestProviderErrorWithMarkerSecretNeverLeaksSecret(t *testing.T) {
+	const key = "REDACTED"
+	pe := NewProviderError(500, []byte(`{"error":"bad key REDACTED","echo":"Bearer REDACTED"}`), key)
+	for _, s := range []string{pe.Error(), pe.Body()} {
+		if strings.Contains(s, key) {
+			t.Fatalf("secret leaked: %q", s)
+		}
+	}
+	if want := `{"error":"bad key ","echo":"Bearer "}`; pe.Body() != want {
+		t.Fatalf("Body() = %q, want %q", pe.Body(), want)
+	}
+}
+
+func TestProviderErrorTruncationMarkCannotCompleteSecret(t *testing.T) {
+	const key = "z…"
+	body := strings.Repeat("a", MaxBodyExcerpt-1) + "z" + strings.Repeat("b", 10)
+	if pe := NewProviderError(500, []byte(body), key); strings.Contains(pe.Body(), key) {
+		t.Fatalf("secret leaked: %q", pe.Body())
+	}
+}
+
+func TestProviderErrorWithFixedWordSecretNeverLeaksSecret(t *testing.T) {
+	const secret = "HTTP"
+	pe := NewProviderError(500, []byte(`{"error":"HTTP down"}`), secret)
+	if strings.Contains(pe.Error(), secret) || strings.Contains(pe.Body(), secret) {
+		t.Fatalf("secret leaked: Error %q, Body %q", pe.Error(), pe.Body())
+	}
+	if got := NewProviderError(500, nil, secret).Error(); got != "llm: provider error: [REDACTED] 500" {
+		t.Fatalf("Error() without body = %q", got)
+	}
+}
+
+func TestRateLimitedErrorWithFixedWordSecretNeverLeaksSecret(t *testing.T) {
+	for _, secret := range []string{"rate", "retry after"} {
+		for _, wait := range []time.Duration{0, 30 * time.Second} {
+			rl := NewRateLimitedError(wait, secret)
+			if strings.Contains(rl.Error(), secret) {
+				t.Fatalf("secret %q leaked: %q", secret, rl.Error())
+			}
+			if rl.RetryAfter != wait || !errors.Is(rl, ErrRateLimited) {
+				t.Fatalf("NewRateLimitedError(%v) = %+v", wait, rl)
+			}
+		}
+	}
+}
+
+func TestTypedErrorsDoNotKeepSecret(t *testing.T) {
+	const secret = "sk-live-0123456789abcdef"
+	for _, err := range []error{
+		NewProviderError(500, []byte("down "+secret), secret),
+		NewRateLimitedError(30*time.Second, secret),
+	} {
+		if got := fmt.Sprintf("%#v %+v", err, err); strings.Contains(got, secret) {
+			t.Fatalf("formatting %T leaks the secret: %q", err, got)
+		}
+	}
+}
+
+func TestTimeoutStatusError(t *testing.T) {
+	err := fmt.Errorf("openai: %w", NewTimeoutStatusError(408, "HTTP"))
+	if !errors.Is(err, ErrTimeout) || errors.Is(err, ErrProvider) {
+		t.Fatalf("%v: want ErrTimeout only", err)
+	}
+	var ts *TimeoutStatusError
+	if !errors.As(err, &ts) || ts.Status() != 408 {
+		t.Fatalf("TimeoutStatusError from %v", err)
+	}
+	if s := ts.Error() + fmt.Sprintf("%#v", ts); strings.Contains(s, "HTTP") {
+		t.Fatalf("text holds the secret: %s", s)
+	}
+}

internal/ai/llm/fake.go

@@ -0,0 +1,127 @@
+package llm
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"slices"
+	"sync"
+)
+
+// Fake is a scripted Provider for tests. Each method returns its queued
+// results in order, one per call, and records every Request Generate
+// receives. A call with nothing left in its queue fails, so an unexpected
+// call is never silently answered. It is safe for concurrent use.
+type Fake struct {
+	mu       sync.Mutex
+	generate []GenerateResult
+	models   []ListModelsResult
+	verify   []error
+	requests []Request
+}
+
+var _ Provider = (*Fake)(nil)
+
+// GenerateResult is one scripted Generate outcome.
+type GenerateResult struct {
+	Response Response
+	Err      error
+}
+
+// ListModelsResult is one scripted ListModels outcome.
+type ListModelsResult struct {
+	Models []Model
+	Err    error
+}
+
+// QueueGenerate appends results to the Generate script.
+func (f *Fake) QueueGenerate(results ...GenerateResult) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.generate = append(f.generate, results...)
+}
+
+// QueueListModels appends results to the ListModels script.
+func (f *Fake) QueueListModels(results ...ListModelsResult) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.models = append(f.models, results...)
+}
+
+// QueueVerify appends results to the Verify script; a nil entry is success.
+func (f *Fake) QueueVerify(results ...error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.verify = append(f.verify, results...)
+}
+
+// Generate records req and returns the next scripted result.
+func (f *Fake) Generate(_ context.Context, req Request) (Response, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	f.requests = append(f.requests, cloneRequest(req))
+	if len(f.generate) == 0 {
+		return Response{}, fmt.Errorf("llm: fake: unscripted Generate call %d", len(f.requests))
+	}
+	r := f.generate[0]
+	f.generate = f.generate[1:]
+	return r.Response, r.Err
+}
+
+// ListModels returns the next scripted result.
+func (f *Fake) ListModels(context.Context) ([]Model, error) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if len(f.models) == 0 {
+		return nil, fmt.Errorf("llm: fake: unscripted ListModels call")
+	}
+	r := f.models[0]
+	f.models = f.models[1:]
+	return slices.Clone(r.Models), r.Err
+}
+
+// Verify returns the next scripted result.
+func (f *Fake) Verify(context.Context) error {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if len(f.verify) == 0 {
+		return fmt.Errorf("llm: fake: unscripted Verify call")
+	}
+	err := f.verify[0]
+	f.verify = f.verify[1:]
+	return err
+}
+
+// Requests returns a copy of every Request Generate received, in order.
+func (f *Fake) Requests() []Request {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	out := make([]Request, len(f.requests))
+	for i, r := range f.requests {
+		out[i] = cloneRequest(r)
+	}
+	return out
+}
+
+// Remaining reports how many scripted results of each kind are unused, so a
+// test can assert its script was consumed.
+func (f *Fake) Remaining() (generate, listModels, verify int) {
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	return len(f.generate), len(f.models), len(f.verify)
+}
+
+// cloneRequest deep-copies r so a recorded Request is unaffected by later
+// changes the caller makes to its slices and pointers.
+func cloneRequest(r Request) Request {
+	r.Messages = slices.Clone(r.Messages)
+	if r.Temperature != nil {
+		t := *r.Temperature
+		r.Temperature = &t
+	}
+	if r.Schema != nil {
+		s := JSONSchema{Name: r.Schema.Name, Schema: json.RawMessage(slices.Clone([]byte(r.Schema.Schema)))}
+		r.Schema = &s
+	}
+	return r
+}

internal/ai/llm/fake_test.go

@@ -0,0 +1,138 @@
+package llm
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestFakeGenerateReturnsScriptInOrder(t *testing.T) {
+	ctx := context.Background()
+	var f Fake
+	f.QueueGenerate(
+		GenerateResult{Response: Response{Text: "first", Model: "m1"}},
+		GenerateResult{Err: &RateLimitedError{RetryAfter: time.Second}},
+	)
+	f.QueueGenerate(GenerateResult{Response: Response{JSON: json.RawMessage(`{"ok":true}`), FinishReason: "stop"}})
+
+	req := Request{Messages: []Message{{Role: RoleUser, Content: "one"}}}
+	resp, err := f.Generate(ctx, req)
+	if err != nil || resp.Text != "first" || resp.Model != "m1" {
+		t.Fatalf("call 1 = %+v, %v", resp, err)
+	}
+	if _, err := f.Generate(ctx, req); !errors.Is(err, ErrRateLimited) {
+		t.Fatalf("call 2 err = %v, want ErrRateLimited", err)
+	}
+	resp, err = f.Generate(ctx, req)
+	if err != nil || string(resp.JSON) != `{"ok":true}` || resp.FinishReason != "stop" {
+		t.Fatalf("call 3 = %+v, %v", resp, err)
+	}
+	if _, err := f.Generate(ctx, req); err == nil {
+		t.Fatal("unscripted call 4 succeeded")
+	}
+	if g, l, v := f.Remaining(); g != 0 || l != 0 || v != 0 {
+		t.Fatalf("Remaining() = %d, %d, %d", g, l, v)
+	}
+	if n := len(f.Requests()); n != 4 {
+		t.Fatalf("recorded %d requests, want 4 (unscripted calls are recorded too)", n)
+	}
+}
+
+func TestFakeRecordsRequests(t *testing.T) {
+	var f Fake
+	f.QueueGenerate(GenerateResult{}, GenerateResult{})
+	temp := 0.2
+	first := Request{
+		System:      "be brief",
+		Messages:    []Message{{Role: RoleUser, Content: "plan dinners"}},
+		Temperature: &temp,
+		MaxTokens:   100,
+		Schema:      &JSONSchema{Name: "plan", Schema: json.RawMessage(`{"type":"object"}`)},
+		Timeout:     5 * time.Second,
+	}
+	if _, err := f.Generate(context.Background(), first); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := f.Generate(context.Background(), Request{System: "second"}); err != nil {
+		t.Fatal(err)
+	}
+
+	// Later changes by the caller must not alter what was recorded.
+	first.Messages[0].Content = "changed"
+	temp = 1
+	first.Schema.Schema[2] = 'X'
+
+	got := f.Requests()
+	if len(got) != 2 || got[1].System != "second" {
+		t.Fatalf("Requests() = %+v", got)
+	}
+	r := got[0]
+	if r.System != "be brief" || r.Messages[0].Content != "plan dinners" || *r.Temperature != 0.2 ||
+		r.MaxTokens != 100 || r.Schema.Name != "plan" || string(r.Schema.Schema) != `{"type":"object"}` ||
+		r.Timeout != 5*time.Second {
+		t.Fatalf("recorded request = %+v", r)
+	}
+
+	// Changing a returned copy must not alter the record either.
+	got[0].Messages[0].Content = "mutated"
+	if f.Requests()[0].Messages[0].Content != "plan dinners" {
+		t.Fatal("Requests() returned shared state")
+	}
+}
+
+func TestFakeListModelsAndVerify(t *testing.T) {
+	ctx := context.Background()
+	var f Fake
+	f.QueueListModels(
+		ListModelsResult{Models: []Model{{ID: "a", DisplayName: "A"}, {ID: "b", DisplayName: "b"}}},
+		ListModelsResult{Err: ErrAuth},
+	)
+	f.QueueVerify(nil, fmt.Errorf("wrapped: %w", ErrAuth))
+
+	models, err := f.ListModels(ctx)
+	if err != nil || len(models) != 2 || models[0].ID != "a" {
+		t.Fatalf("ListModels 1 = %+v, %v", models, err)
+	}
+	if _, err := f.ListModels(ctx); !errors.Is(err, ErrAuth) {
+		t.Fatalf("ListModels 2 err = %v, want ErrAuth", err)
+	}
+	if _, err := f.ListModels(ctx); err == nil {
+		t.Fatal("unscripted ListModels succeeded")
+	}
+	if err := f.Verify(ctx); err != nil {
+		t.Fatalf("Verify 1 = %v", err)
+	}
+	if err := f.Verify(ctx); !errors.Is(err, ErrAuth) {
+		t.Fatalf("Verify 2 = %v, want ErrAuth", err)
+	}
+	if err := f.Verify(ctx); err == nil {
+		t.Fatal("unscripted Verify succeeded")
+	}
+}
+
+func TestFakeConcurrentUse(t *testing.T) {
+	const n = 50
+	var f Fake
+	for i := range n {
+		f.QueueGenerate(GenerateResult{Response: Response{Text: fmt.Sprint(i)}})
+	}
+	var wg sync.WaitGroup
+	for range n {
+		wg.Go(func() {
+			if _, err := f.Generate(context.Background(), Request{}); err != nil {
+				t.Error(err)
+			}
+		})
+	}
+	wg.Wait()
+	if len(f.Requests()) != n {
+		t.Fatalf("recorded %d requests, want %d", len(f.Requests()), n)
+	}
+	if g, _, _ := f.Remaining(); g != 0 {
+		t.Fatalf("%d Generate results unused", g)
+	}
+}

internal/ai/llm/llm.go

@@ -0,0 +1,133 @@
+// Package llm is the single interface MealQuest uses to talk to a language
+// model. Every vendor adapter implements Provider over plain net/http (no
+// vendor SDKs) and reports failures with this package's typed errors, so
+// callers decide what to do from errors.Is and errors.As alone.
+//
+// Errors from this package and its adapters never contain an API key.
+package llm
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+)
+
+// Provider is a language-model vendor.
+type Provider interface {
+	// Generate sends one request and returns the model's reply.
+	Generate(ctx context.Context, req Request) (Response, error)
+	// ListModels returns the models the configured credentials can use.
+	ListModels(ctx context.Context) ([]Model, error)
+	// Verify checks that the configured credentials are accepted.
+	Verify(ctx context.Context) error
+}
+
+// Role is the author of a Message.
+type Role string
+
+// The roles a Message may have. The system prompt is Request.System, not a
+// message.
+const (
+	RoleUser      Role = "user"
+	RoleAssistant Role = "assistant"
+)
+
+// Message is one turn of a conversation.
+type Message struct {
+	Role    Role
+	Content string
+}
+
+// JSONSchema is a named structured-output contract: when a Request carries
+// one, the model must reply with JSON matching Schema.
+type JSONSchema struct {
+	// Name identifies the contract to the vendor, e.g. "side_quests".
+	Name string
+	// Schema is a JSON Schema object.
+	Schema json.RawMessage
+}
+
+// Request is one generation request.
+type Request struct {
+	// System is the system prompt; empty means none.
+	System string
+	// Messages is the conversation, oldest first. It must not be empty.
+	Messages []Message
+	// Temperature is the sampling temperature; nil means the vendor default.
+	Temperature *float64
+	// MaxTokens caps the reply length; 0 means the vendor default.
+	MaxTokens int
+	// Schema, when set, requests structured output; the reply is then in
+	// Response.JSON.
+	Schema *JSONSchema
+	// Timeout bounds the request; 0 means only ctx bounds it.
+	Timeout time.Duration
+}
+
+// Validate reports whether r is well formed. Adapters call it before
+// contacting the vendor. Its errors never quote the request's text, such as
+// a role or schema name: any of it may equal the API key.
+func (r Request) Validate() error {
+	if len(r.Messages) == 0 {
+		return errors.New("llm: request has no messages")
+	}
+	for i, m := range r.Messages {
+		if m.Role != RoleUser && m.Role != RoleAssistant {
+			return fmt.Errorf("llm: message %d has an unknown role", i)
+		}
+	}
+	if r.Temperature != nil && *r.Temperature < 0 {
+		return fmt.Errorf("llm: temperature %v is negative", *r.Temperature)
+	}
+	if r.MaxTokens < 0 {
+		return fmt.Errorf("llm: max tokens %d is negative", r.MaxTokens)
+	}
+	if r.Timeout < 0 {
+		return fmt.Errorf("llm: timeout %v is negative", r.Timeout)
+	}
+	if r.Schema != nil {
+		if r.Schema.Name == "" {
+			return errors.New("llm: schema has no name")
+		}
+		var obj map[string]json.RawMessage
+		if err := json.Unmarshal(r.Schema.Schema, &obj); err != nil || obj == nil {
+			return errors.New("llm: schema is not a JSON object")
+		}
+	}
+	return nil
+}
+
+// Usage is the token count of one Generate call.
+type Usage struct {
+	InputTokens  int
+	OutputTokens int
+}
+
+// Total returns InputTokens + OutputTokens.
+func (u Usage) Total() int { return u.InputTokens + u.OutputTokens }
+
+// Response is the model's reply to a Request.
+type Response struct {
+	// Text is the reply text.
+	Text string
+	// JSON is the structured reply when the Request carried a Schema, and
+	// nil otherwise.
+	JSON json.RawMessage
+	// Usage is the tokens the call consumed.
+	Usage Usage
+	// Model is the model that answered, as the vendor reports it.
+	Model string
+	// FinishReason is why generation stopped, as the vendor reports it.
+	FinishReason string
+}
+
+// Model is a model a Provider offers.
+type Model struct {
+	// ID is the vendor's model identifier, used in requests.
+	ID string
+	// DisplayName is a human-readable name; it equals ID when the vendor
+	// gives none.
+	DisplayName string
+}

internal/ai/llm/llm_test.go

@@ -0,0 +1,44 @@
+package llm
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+func TestRequestValidate(t *testing.T) {
+	neg := -0.1
+	valid := func() Request {
+		return Request{
+			Messages: []Message{{Role: RoleUser, Content: "hi"}, {Role: RoleAssistant, Content: "hello"}},
+			Schema:   &JSONSchema{Name: "plan", Schema: json.RawMessage(`{"type":"object"}`)},
+		}
+	}
+	if err := valid().Validate(); err != nil {
+		t.Fatalf("valid request: %v", err)
+	}
+	cases := map[string]func(*Request){
+		"no messages":    func(r *Request) { r.Messages = nil },
+		"unknown role":   func(r *Request) { r.Messages[0].Role = "system" },
+		"negative temp":  func(r *Request) { r.Temperature = &neg },
+		"negative max":   func(r *Request) { r.MaxTokens = -1 },
+		"negative time":  func(r *Request) { r.Timeout = -1 },
+		"unnamed schema": func(r *Request) { r.Schema.Name = "" },
+		"schema array":   func(r *Request) { r.Schema.Schema = json.RawMessage(`[]`) },
+		"schema null":    func(r *Request) { r.Schema.Schema = json.RawMessage(`null`) },
+		"schema invalid": func(r *Request) { r.Schema.Schema = json.RawMessage(`{`) },
+		"schema empty":   func(r *Request) { r.Schema.Schema = nil },
+	}
+	for name, mutate := range cases {
+		r := valid()
+		mutate(&r)
+		if err := r.Validate(); err == nil {
+			t.Errorf("%s: Validate() = nil", name)
+		}
+	}
+}
+
+func TestUsageTotal(t *testing.T) {
+	if got := (Usage{InputTokens: 12, OutputTokens: 30}).Total(); got != 42 {
+		t.Fatalf("Total() = %d, want 42", got)
+	}
+}

internal/ai/llm/ollama/ollama.go

@@ -0,0 +1,325 @@
+// Package ollama is the llm.Provider adapter for Ollama's native API. It
+// calls POST {base}/api/chat and GET {base}/api/tags over plain net/http.
+//
+// Ollama takes no credentials: the adapter sends no Authorization header
+// and never logs. The base URL may be a LAN address, and errors for an
+// unreachable server name it, so New refuses a base URL that could carry a
+// credential.
+package ollama
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// Config configures a Provider.
+type Config struct {
+	// BaseURL is the Ollama server root the /api endpoint paths are
+	// appended to, e.g. "http://192.168.1.20:11434" or
+	// "http://ollama:11434". It is required.
+	BaseURL string
+	// Model is the model Generate requests, e.g. "llama3.2". ListModels
+	// and Verify do not need it.
+	Model string
+}
+
+// Provider is an Ollama native API llm.Provider.
+type Provider struct {
+	base   string
+	model  string
+	client *http.Client
+}
+
+var _ llm.Provider = (*Provider)(nil)
+
+// New validates cfg and returns a Provider.
+func New(cfg Config) (*Provider, error) {
+	// Base URL errors never echo the URL: a rejected one may hold a
+	// credential.
+	u, err := url.Parse(cfg.BaseURL)
+	if err != nil {
+		return nil, errors.New("ollama: base URL does not parse")
+	}
+	if (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
+		return nil, errors.New("ollama: base URL must be an absolute http or https URL")
+	}
+	// A trailing "?" or "#" parses to an empty query or fragment, yet the
+	// endpoint path appended to it would land in the query or fragment.
+	if u.User != nil || strings.ContainsAny(cfg.BaseURL, "?#") {
+		return nil, errors.New("ollama: base URL must not carry credentials, a query or a fragment")
+	}
+	return &Provider{
+		base:   strings.TrimRight(cfg.BaseURL, "/"),
+		model:  cfg.Model,
+		client: noRedirectClient(),
+	}, nil
+}
+
+// maxResponseBody caps a successful response body; a larger one is an error.
+const maxResponseBody = 16 << 20
+
+// maxErrorBody caps how much of an error response body is read; only an
+// llm.MaxBodyExcerpt of it is kept.
+const maxErrorBody = 64 << 10
+
+type message struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type options struct {
+	Temperature *float64 `json:"temperature,omitempty"`
+	NumPredict  int      `json:"num_predict,omitempty"`
+}
+
+type chatRequest struct {
+	Model    string          `json:"model"`
+	Messages []message       `json:"messages"`
+	Stream   bool            `json:"stream"`
+	Format   json.RawMessage `json:"format,omitempty"`
+	Options  *options        `json:"options,omitempty"`
+}
+
+type chatResponse struct {
+	Model   string `json:"model"`
+	Message *struct {
+		Role    string `json:"role"`
+		Content string `json:"content"`
+	} `json:"message"`
+	Done            bool   `json:"done"`
+	DoneReason      string `json:"done_reason"`
+	PromptEvalCount int    `json:"prompt_eval_count"`
+	EvalCount       int    `json:"eval_count"`
+}
+
+// Generate sends req to {base}/api/chat without streaming. A Request with a
+// Schema sends it as "format", so Ollama constrains the reply to it;
+// Response.JSON is then the reply text, which must be a JSON object.
+func (p *Provider) Generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	if err := req.Validate(); err != nil {
+		return llm.Response{}, fmt.Errorf("ollama: generate: %w", err)
+	}
+	if p.model == "" {
+		return llm.Response{}, errors.New("ollama: generate: no model configured")
+	}
+	body := chatRequest{Model: p.model, Stream: false}
+	if req.System != "" {
+		body.Messages = append(body.Messages, message{Role: "system", Content: req.System})
+	}
+	for _, m := range req.Messages {
+		body.Messages = append(body.Messages, message{Role: string(m.Role), Content: m.Content})
+	}
+	if req.Schema != nil {
+		body.Format = req.Schema.Schema
+	}
+	if req.Temperature != nil || req.MaxTokens > 0 {
+		body.Options = &options{Temperature: req.Temperature, NumPredict: req.MaxTokens}
+	}
+	payload, err := json.Marshal(body)
+	if err != nil {
+		return llm.Response{}, fmt.Errorf("ollama: generate: encode request: %w", err)
+	}
+
+	if req.Timeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(ctx, req.Timeout)
+		defer cancel()
+	}
+	raw, err := p.do(ctx, http.MethodPost, "/api/chat", payload)
+	if err != nil {
+		var pe *llm.ProviderError
+		if errors.As(err, &pe) && pe.Status() == http.StatusNotFound && p.modelNotFound(pe.Body()) {
+			// The body is not quoted: the model name is all the caller
+			// needs. Any other 404 keeps its body excerpt below.
+			return llm.Response{}, fmt.Errorf("ollama: generate: model %q not found: %w", p.model, llm.NewProviderError(pe.Status(), nil, ""))
+		}
+		return llm.Response{}, fmt.Errorf("ollama: generate: %w", err)
+	}
+
+	var cr chatResponse
+	if err := json.Unmarshal(raw, &cr); err != nil {
+		return llm.Response{}, fmt.Errorf("ollama: generate: decode response: %w", err)
+	}
+	if !cr.Done || cr.Message == nil {
+		return llm.Response{}, errors.New("ollama: generate: response is not a finished message")
+	}
+	resp := llm.Response{
+		Text:         cr.Message.Content,
+		Usage:        llm.Usage{InputTokens: cr.PromptEvalCount, OutputTokens: cr.EvalCount},
+		Model:        cr.Model,
+		FinishReason: cr.DoneReason,
+	}
+	if req.Schema == nil {
+		return resp, nil
+	}
+	if text := strings.TrimSpace(resp.Text); isJSONObject(text) {
+		resp.JSON = json.RawMessage(text)
+		return resp, nil
+	}
+	return resp, fmt.Errorf("ollama: generate: reply is not a JSON object: %w", llm.ErrBadOutput)
+}
+
+// modelNotFound reports whether body is Ollama's error for the configured
+// model not being pulled: {"error": "model \"name\" not found, ..."}, or
+// with the name in single quotes as newer servers send it. A 404 from
+// anything else, such as a proxy without /api/chat, is not.
+func (p *Provider) modelNotFound(body string) bool {
+	var e struct {
+		Error string `json:"error"`
+	}
+	if err := json.Unmarshal([]byte(body), &e); err != nil {
+		return false
+	}
+	return strings.HasPrefix(e.Error, fmt.Sprintf("model %q not found", p.model)) ||
+		strings.HasPrefix(e.Error, fmt.Sprintf("model '%s' not found", p.model))
+}
+
+// isJSONObject reports whether s is exactly one JSON object.
+func isJSONObject(s string) bool {
+	return strings.HasPrefix(s, "{") && json.Valid([]byte(s))
+}
+
+type tagsResponse struct {
+	Models []struct {
+		Name string `json:"name"`
+	} `json:"models"`
+}
+
+// ListModels returns every model {base}/api/tags lists.
+func (p *Provider) ListModels(ctx context.Context) ([]llm.Model, error) {
+	models, err := p.tags(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("ollama: list models: %w", err)
+	}
+	return models, nil
+}
+
+// Verify checks that the server answers GET {base}/api/tags with a model
+// list.
+func (p *Provider) Verify(ctx context.Context) error {
+	if _, err := p.tags(ctx); err != nil {
+		return fmt.Errorf("ollama: verify: %w", err)
+	}
+	return nil
+}
+
+func (p *Provider) tags(ctx context.Context) ([]llm.Model, error) {
+	raw, err := p.do(ctx, http.MethodGet, "/api/tags", nil)
+	if err != nil {
+		return nil, err
+	}
+	var tr tagsResponse
+	if err := json.Unmarshal(raw, &tr); err != nil {
+		return nil, fmt.Errorf("decode response: %w", err)
+	}
+	if tr.Models == nil {
+		return nil, errors.New("response has no models list")
+	}
+	models := make([]llm.Model, 0, len(tr.Models))
+	for i, m := range tr.Models {
+		if m.Name == "" {
+			return nil, fmt.Errorf("model %d has no name", i)
+		}
+		models = append(models, llm.Model{ID: m.Name, DisplayName: m.Name})
+	}
+	return models, nil
+}
+
+// do sends one request and returns the body of a 2xx response. Any other
+// status, a 3xx included, is an *llm.ProviderError.
+func (p *Provider) do(ctx context.Context, method, path string, payload []byte) ([]byte, error) {
+	var reqBody io.Reader
+	if payload != nil {
+		reqBody = bytes.NewReader(payload)
+	}
+	httpReq, err := http.NewRequestWithContext(ctx, method, p.base+path, reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("build request: %w", err)
+	}
+	httpReq.Header.Set("Accept", "application/json")
+	if payload != nil {
+		httpReq.Header.Set("Content-Type", "application/json")
+	}
+
+	httpResp, err := p.client.Do(httpReq)
+	if err != nil {
+		return nil, p.transportError(err)
+	}
+	defer httpResp.Body.Close()
+
+	if httpResp.StatusCode < 200 || httpResp.StatusCode > 299 {
+		body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxErrorBody))
+		if err != nil {
+			return nil, p.transportError(err)
+		}
+		return nil, llm.NewProviderError(httpResp.StatusCode, body, "")
+	}
+	body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxResponseBody+1))
+	if err != nil {
+		return nil, p.transportError(err)
+	}
+	if len(body) > maxResponseBody {
+		return nil, fmt.Errorf("response body exceeds %d bytes", maxResponseBody)
+	}
+	return body, nil
+}
+
+// noRedirectClient returns an HTTP client that never follows a redirect:
+// the 3xx response is returned and becomes a provider error, so a request
+// is only ever sent to the configured server.
+func noRedirectClient() *http.Client {
+	return &http.Client{
+		CheckRedirect: func(*http.Request, []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+}
+
+func isTimeout(err error) bool {
+	var ne net.Error
+	return errors.Is(err, context.DeadlineExceeded) || (errors.As(err, &ne) && ne.Timeout())
+}
+
+// transportFailure is a failed HTTP exchange. Its text names the base URL
+// and the cause; it unwraps only to the cause's category, llm.ErrTimeout or
+// context.Canceled.
+type transportFailure struct {
+	text string
+	kind error
+}
+
+func (e *transportFailure) Error() string { return e.text }
+
+func (e *transportFailure) Unwrap() error { return e.kind }
+
+// transportError reports a failure to complete the HTTP exchange. A
+// cancelled context is the caller's choice and stays context.Canceled.
+// Every other failure, a refused connection or a timeout alike, means the
+// server could not be reached in time: it matches llm.ErrTimeout and says
+// "Ollama not reachable at {base}".
+func (p *Provider) transportError(err error) error {
+	timedOut := isTimeout(err)
+	// The *url.Error repeats the request URL; the base is named once below.
+	var ue *url.Error
+	if errors.As(err, &ue) {
+		err = ue.Err
+	}
+	if !timedOut && errors.Is(err, context.Canceled) {
+		return &transportFailure{text: "request canceled: " + err.Error(), kind: context.Canceled}
+	}
+	text := fmt.Sprintf("Ollama not reachable at %s: %s", p.base, err)
+	if timedOut {
+		text = fmt.Sprintf("Ollama not reachable at %s: %s: %s", p.base, llm.ErrTimeout, err)
+	}
+	return &transportFailure{text: text, kind: llm.ErrTimeout}
+}

internal/ai/llm/ollama/ollama_test.go

@@ -0,0 +1,615 @@
+package ollama
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// recorded is one request the test server received.
+type recorded struct {
+	method string
+	path   string
+	query  url.Values
+	header http.Header
+	body   []byte
+}
+
+// reply is a response the test server replays.
+type reply struct {
+	status  int
+	fixture string // testdata file
+	body    string // used when fixture is empty
+	delay   time.Duration
+}
+
+// ollamaServer replays its replies in order, repeating the last, and
+// records every request.
+type ollamaServer struct {
+	*httptest.Server
+	mu  sync.Mutex
+	got []recorded
+}
+
+func newOllamaServer(t *testing.T, replies ...reply) *ollamaServer {
+	t.Helper()
+	payloads := make([][]byte, len(replies))
+	for i, r := range replies {
+		payloads[i] = []byte(r.body)
+		if r.fixture != "" {
+			raw, err := os.ReadFile(filepath.Join("testdata", r.fixture))
+			if err != nil {
+				t.Fatal(err)
+			}
+			payloads[i] = raw
+		}
+	}
+	s := &ollamaServer{}
+	s.Server = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		body, _ := io.ReadAll(req.Body)
+		s.mu.Lock()
+		n := len(s.got)
+		s.got = append(s.got, recorded{req.Method, req.URL.Path, req.URL.Query(), req.Header.Clone(), body})
+		s.mu.Unlock()
+		i := min(n, len(replies)-1)
+		r := replies[i]
+		if r.delay > 0 {
+			select {
+			case <-time.After(r.delay):
+			case <-req.Context().Done():
+				return
+			}
+		}
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(r.status)
+		w.Write(payloads[i])
+	}))
+	t.Cleanup(s.Close)
+	return s
+}
+
+func (s *ollamaServer) requests() []recorded {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return append([]recorded(nil), s.got...)
+}
+
+func (s *ollamaServer) only(t *testing.T) recorded {
+	t.Helper()
+	got := s.requests()
+	if len(got) != 1 {
+		t.Fatalf("server got %d requests, want 1", len(got))
+	}
+	return got[0]
+}
+
+func newProvider(t *testing.T, base string) *Provider {
+	t.Helper()
+	p, err := New(Config{BaseURL: base, Model: "llama3.2"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return p
+}
+
+var dinnersSchema = json.RawMessage(`{"type":"object","properties":{"dinners":{"type":"array"}},"required":["dinners"]}`)
+
+func schemaRequest() llm.Request {
+	temp := 0.0
+	return llm.Request{
+		System: "You plan dinners for Our kitchen.",
+		Messages: []llm.Message{
+			{Role: llm.RoleUser, Content: "Suggest a Side quest."},
+			{Role: llm.RoleAssistant, Content: "Something quick?"},
+			{Role: llm.RoleUser, Content: "Yes, a Quick dinner."},
+		},
+		Temperature: &temp,
+		MaxTokens:   400,
+		Schema:      &llm.JSONSchema{Name: "side_quests", Schema: dinnersSchema},
+	}
+}
+
+func textRequest() llm.Request {
+	return llm.Request{Messages: []llm.Message{{Role: llm.RoleUser, Content: "What should we cook tonight?"}}}
+}
+
+// sentBody decodes a request body into a generic map.
+func sentBody(t *testing.T, r recorded) map[string]any {
+	t.Helper()
+	var m map[string]any
+	if err := json.Unmarshal(r.body, &m); err != nil {
+		t.Fatalf("request body %q: %v", r.body, err)
+	}
+	return m
+}
+
+// canonical re-encodes JSON so two encodings of one value compare equal.
+func canonical(t *testing.T, raw []byte) string {
+	t.Helper()
+	var v any
+	if err := json.Unmarshal(raw, &v); err != nil {
+		t.Fatalf("JSON %q: %v", raw, err)
+	}
+	out, _ := json.Marshal(v)
+	return string(out)
+}
+
+func assertNoAuth(t *testing.T, r recorded) {
+	t.Helper()
+	if got := r.header.Values("Authorization"); len(got) != 0 {
+		t.Errorf("Authorization = %q, want none", got)
+	}
+}
+
+func TestGenerateText(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "chat_text.json"})
+	p := newProvider(t, s.URL+"/")
+
+	resp, err := p.Generate(context.Background(), textRequest())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.Text != "Try a crock pot chili: it is a Quick dinner." || resp.JSON != nil {
+		t.Errorf("Text, JSON = %q, %s", resp.Text, resp.JSON)
+	}
+	if resp.Usage != (llm.Usage{InputTokens: 26, OutputTokens: 298}) || resp.Model != "llama3.2" || resp.FinishReason != "stop" {
+		t.Errorf("Usage, Model, FinishReason = %+v, %q, %q", resp.Usage, resp.Model, resp.FinishReason)
+	}
+
+	got := s.only(t)
+	if got.method != http.MethodPost || got.path != "/api/chat" || len(got.query) != 0 {
+		t.Errorf("request = %s %s?%s", got.method, got.path, got.query.Encode())
+	}
+	assertNoAuth(t, got)
+	body := sentBody(t, got)
+	if stream, ok := body["stream"]; !ok || stream != false {
+		t.Errorf("stream = %v (present %v), want false", stream, ok)
+	}
+	if body["model"] != "llama3.2" {
+		t.Errorf("model = %v", body["model"])
+	}
+	for _, field := range []string{"format", "options"} {
+		if v, ok := body[field]; ok {
+			t.Errorf("%s = %v, want it omitted", field, v)
+		}
+	}
+	if got, want := canonical(t, mustMarshal(t, body["messages"])), `[{"content":"What should we cook tonight?","role":"user"}]`; got != want {
+		t.Errorf("messages = %s, want %s", got, want)
+	}
+}
+
+func mustMarshal(t *testing.T, v any) []byte {
+	t.Helper()
+	raw, err := json.Marshal(v)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return raw
+}
+
+func TestGenerateSchemaOutput(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "chat_schema.json"})
+	p := newProvider(t, s.URL)
+
+	resp, err := p.Generate(context.Background(), schemaRequest())
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := `{"dinners":[{"name":"Sheet-pan gnocchi","why":"Like your Regular tray bake, but quicker."}]}`
+	if got := canonical(t, resp.JSON); got != want {
+		t.Errorf("Response.JSON = %s, want %s", got, want)
+	}
+	if canonical(t, []byte(resp.Text)) != want {
+		t.Errorf("Text = %q, want the reply content", resp.Text)
+	}
+	if resp.Usage != (llm.Usage{InputTokens: 147, OutputTokens: 41}) || resp.FinishReason != "stop" {
+		t.Errorf("Usage, FinishReason = %+v, %q", resp.Usage, resp.FinishReason)
+	}
+
+	got := s.only(t)
+	assertNoAuth(t, got)
+	body := sentBody(t, got)
+	if body["stream"] != false {
+		t.Errorf("stream = %v, want false", body["stream"])
+	}
+	if got, want := canonical(t, mustMarshal(t, body["format"])), canonical(t, dinnersSchema); got != want {
+		t.Errorf("format = %s, want the schema %s", got, want)
+	}
+	opts, _ := body["options"].(map[string]any)
+	if len(opts) != 2 || opts["temperature"] != 0.0 || opts["num_predict"] != 400.0 {
+		t.Errorf("options = %v, want temperature 0 and num_predict 400", body["options"])
+	}
+	wantMessages := `[{"content":"You plan dinners for Our kitchen.","role":"system"},` +
+		`{"content":"Suggest a Side quest.","role":"user"},` +
+		`{"content":"Something quick?","role":"assistant"},` +
+		`{"content":"Yes, a Quick dinner.","role":"user"}]`
+	if got := canonical(t, mustMarshal(t, body["messages"])); got != wantMessages {
+		t.Errorf("messages = %s, want %s", got, wantMessages)
+	}
+}
+
+func TestGenerateTemperatureOnlyWhenSet(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "chat_text.json"})
+	req := textRequest()
+	temp := 0.7
+	req.Temperature = &temp
+	if _, err := newProvider(t, s.URL).Generate(context.Background(), req); err != nil {
+		t.Fatal(err)
+	}
+	opts, _ := sentBody(t, s.only(t))["options"].(map[string]any)
+	if len(opts) != 1 || opts["temperature"] != 0.7 {
+		t.Errorf("options = %v, want only temperature 0.7", opts)
+	}
+}
+
+func TestGenerateBadOutput(t *testing.T) {
+	cases := map[string]string{
+		"prose":        `{"model":"m","message":{"role":"assistant","content":"Sure! Try chili."},"done":true,"done_reason":"stop"}`,
+		"array":        `{"model":"m","message":{"role":"assistant","content":"[1,2]"},"done":true,"done_reason":"stop"}`,
+		"cut-off JSON": `{"model":"m","message":{"role":"assistant","content":"{\"dinners\": ["},"done":true,"done_reason":"length"}`,
+	}
+	for name, body := range cases {
+		t.Run(name, func(t *testing.T) {
+			s := newOllamaServer(t, reply{status: 200, body: body})
+			resp, err := newProvider(t, s.URL).Generate(context.Background(), schemaRequest())
+			if !errors.Is(err, llm.ErrBadOutput) {
+				t.Fatalf("err = %v, want ErrBadOutput", err)
+			}
+			if resp.JSON != nil || resp.Model != "m" || resp.Text == "" {
+				t.Fatalf("Response = %+v, want no JSON and the reply kept", resp)
+			}
+		})
+	}
+}
+
+func TestGenerateRejectsMalformedResponses(t *testing.T) {
+	for name, body := range map[string]string{
+		"not JSON":     `not json`,
+		"not finished": `{"model":"m","message":{"role":"assistant","content":"hi"},"done":false}`,
+		"no message":   `{"model":"m","done":true}`,
+	} {
+		s := newOllamaServer(t, reply{status: 200, body: body})
+		_, err := newProvider(t, s.URL).Generate(context.Background(), textRequest())
+		if err == nil || errors.Is(err, llm.ErrBadOutput) || errors.Is(err, llm.ErrProvider) {
+			t.Errorf("%s: err = %v, want an untyped malformed-response error", name, err)
+		}
+	}
+}
+
+func TestGenerateRejectsInvalidRequests(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "chat_text.json"})
+	if _, err := newProvider(t, s.URL).Generate(context.Background(), llm.Request{}); err == nil {
+		t.Error("Generate accepted a request with no messages")
+	}
+	noModel, err := New(Config{BaseURL: s.URL})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := noModel.Generate(context.Background(), textRequest()); err == nil {
+		t.Error("Generate ran with no model configured")
+	}
+	if n := len(s.requests()); n != 0 {
+		t.Errorf("server got %d requests, want 0", n)
+	}
+}
+
+func TestGenerateModelMissing(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 404, fixture: "error_model_not_found.json"})
+	p, err := New(Config{BaseURL: s.URL, Model: "llama9"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = p.Generate(context.Background(), textRequest())
+	var pe *llm.ProviderError
+	if !errors.Is(err, llm.ErrProvider) || !errors.As(err, &pe) || pe.Status() != http.StatusNotFound {
+		t.Fatalf("err = %v, want a ProviderError for HTTP 404", err)
+	}
+	if errors.Is(err, llm.ErrTimeout) || errors.Is(err, llm.ErrBadOutput) {
+		t.Fatalf("err = %v matches an unrelated sentinel", err)
+	}
+	if want := `ollama: generate: model "llama9" not found: llm: provider error: HTTP 404`; err.Error() != want {
+		t.Fatalf("Error() = %q, want %q", err, want)
+	}
+	if pe.Body() != "" {
+		t.Fatalf("Body() = %q, want the response body left out", pe.Body())
+	}
+}
+
+func TestGenerateNotFoundUnrelatedToModel(t *testing.T) {
+	for name, body := range map[string]string{
+		"proxy page":  "404 page not found",
+		"other error": `{"error":"no route for /api/chat"}`,
+		"other model": `{"error":"model \"llama3\" not found, try pulling it first"}`,
+		"empty":       "",
+	} {
+		t.Run(name, func(t *testing.T) {
+			s := newOllamaServer(t, reply{status: 404, body: body})
+			p, err := New(Config{BaseURL: s.URL, Model: "llama9"})
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, err = p.Generate(context.Background(), textRequest())
+			var pe *llm.ProviderError
+			if !errors.Is(err, llm.ErrProvider) || !errors.As(err, &pe) || pe.Status() != http.StatusNotFound {
+				t.Fatalf("err = %v, want a ProviderError for HTTP 404", err)
+			}
+			if strings.Contains(err.Error(), "not found") && !strings.Contains(body, "not found") {
+				t.Fatalf("Error() = %q claims something was not found", err)
+			}
+			if strings.Contains(err.Error(), "llama9") {
+				t.Fatalf("Error() = %q claims the model was not found", err)
+			}
+			if pe.Body() != strings.TrimSpace(body) {
+				t.Fatalf("Body() = %q, want the response body %q", pe.Body(), body)
+			}
+		})
+	}
+}
+
+func TestGenerateModelMissingSingleQuoted(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 404, body: `{"error":"model 'llama9' not found"}`})
+	p, err := New(Config{BaseURL: s.URL, Model: "llama9"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = p.Generate(context.Background(), textRequest())
+	if want := `ollama: generate: model "llama9" not found: llm: provider error: HTTP 404`; err == nil || err.Error() != want {
+		t.Fatalf("err = %v, want %q", err, want)
+	}
+}
+
+func TestListModels(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "tags.json"})
+	models, err := newProvider(t, s.URL).ListModels(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []llm.Model{{ID: "llama3.2:latest", DisplayName: "llama3.2:latest"}, {ID: "qwen3:8b", DisplayName: "qwen3:8b"}}
+	if len(models) != len(want) || models[0] != want[0] || models[1] != want[1] {
+		t.Fatalf("ListModels() = %+v, want %+v", models, want)
+	}
+	got := s.only(t)
+	if got.method != http.MethodGet || got.path != "/api/tags" || len(got.query) != 0 {
+		t.Errorf("request = %s %s?%s", got.method, got.path, got.query.Encode())
+	}
+	assertNoAuth(t, got)
+
+	empty := newOllamaServer(t, reply{status: 200, body: `{"models":[]}`})
+	if models, err := newProvider(t, empty.URL).ListModels(context.Background()); err != nil || models == nil || len(models) != 0 {
+		t.Fatalf("empty list: %v, %v", models, err)
+	}
+	for name, body := range map[string]string{
+		"no models list": `{}`,
+		"unnamed model":  `{"models":[{"model":"x"}]}`,
+		"not JSON":       `<html>`,
+	} {
+		bad := newOllamaServer(t, reply{status: 200, body: body})
+		if _, err := newProvider(t, bad.URL).ListModels(context.Background()); err == nil {
+			t.Errorf("%s: ListModels accepted it", name)
+		}
+	}
+}
+
+func TestVerify(t *testing.T) {
+	ok := newOllamaServer(t, reply{status: 200, fixture: "tags.json"})
+	if err := newProvider(t, ok.URL).Verify(context.Background()); err != nil {
+		t.Fatalf("Verify() = %v", err)
+	}
+	got := ok.only(t)
+	if got.method != http.MethodGet || got.path != "/api/tags" {
+		t.Errorf("Verify called %s %s", got.method, got.path)
+	}
+	assertNoAuth(t, got)
+
+	bad := newOllamaServer(t, reply{status: 500, body: `{"error":"something went wrong"}`})
+	err := newProvider(t, bad.URL).Verify(context.Background())
+	var pe *llm.ProviderError
+	if !errors.As(err, &pe) || pe.Status() != 500 || !strings.Contains(err.Error(), "something went wrong") {
+		t.Fatalf("Verify() = %v, want a ProviderError for HTTP 500", err)
+	}
+	malformed := newOllamaServer(t, reply{status: 200, body: `{}`})
+	if err := newProvider(t, malformed.URL).Verify(context.Background()); err == nil {
+		t.Error("Verify accepted a body with no models list")
+	}
+}
+
+func TestProviderErrors(t *testing.T) {
+	cases := map[string]reply{
+		"400":  {status: 400, body: `{"error":"invalid format"}`},
+		"500":  {status: 500, body: `{"error":"llama runner process has terminated"}`},
+		"503":  {status: 503, body: `{"error":"server busy, please try again"}`},
+		"huge": {status: 500, body: strings.Repeat("x", 1<<20)},
+	}
+	for name, r := range cases {
+		t.Run(name, func(t *testing.T) {
+			s := newOllamaServer(t, r)
+			p := newProvider(t, s.URL)
+			_, genErr := p.Generate(context.Background(), schemaRequest())
+			_, listErr := p.ListModels(context.Background())
+			for _, err := range []error{genErr, listErr} {
+				var pe *llm.ProviderError
+				if !errors.As(err, &pe) || pe.Status() != r.status {
+					t.Fatalf("err = %v, want a ProviderError for HTTP %d", err, r.status)
+				}
+				if errors.Is(err, llm.ErrTimeout) || strings.Contains(err.Error(), "not found") {
+					t.Fatalf("err = %v, want only a provider error", err)
+				}
+				if len(err.Error()) > llm.MaxBodyExcerpt+200 {
+					t.Fatalf("error text has %d bytes, want a bounded excerpt", len(err.Error()))
+				}
+			}
+		})
+	}
+}
+
+// assertUnreachable checks the error a request to an unreachable base
+// returns: it matches llm.ErrTimeout and names the base.
+func assertUnreachable(t *testing.T, err error, base string) {
+	t.Helper()
+	if !errors.Is(err, llm.ErrTimeout) {
+		t.Fatalf("err = %v, want ErrTimeout", err)
+	}
+	if errors.Is(err, llm.ErrProvider) || errors.Is(err, context.Canceled) {
+		t.Fatalf("err = %v matches an unrelated sentinel", err)
+	}
+	if want := "Ollama not reachable at " + base; !strings.Contains(err.Error(), want) {
+		t.Fatalf("Error() = %q, want it to contain %q", err, want)
+	}
+	var ue *url.Error
+	if errors.As(err, &ue) {
+		t.Fatalf("error chain exposes the url.Error: %v", ue)
+	}
+}
+
+func TestUnreachableHost(t *testing.T) {
+	closed := httptest.NewServer(http.NotFoundHandler())
+	base := closed.URL
+	closed.Close()
+
+	p := newProvider(t, base+"/")
+	_, genErr := p.Generate(context.Background(), schemaRequest())
+	_, listErr := p.ListModels(context.Background())
+	verifyErr := p.Verify(context.Background())
+	for _, err := range []error{genErr, listErr, verifyErr} {
+		assertUnreachable(t, err, base)
+		if !strings.Contains(err.Error(), "connection refused") {
+			t.Errorf("Error() = %q, want the cause", err)
+		}
+	}
+
+	dropped := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		conn, _, err := w.(http.Hijacker).Hijack()
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		conn.Close()
+	}))
+	t.Cleanup(dropped.Close)
+	_, err := newProvider(t, dropped.URL).Generate(context.Background(), textRequest())
+	assertUnreachable(t, err, dropped.URL)
+}
+
+func TestTimeouts(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "chat_schema.json", delay: 5 * time.Second})
+	p := newProvider(t, s.URL)
+
+	req := schemaRequest()
+	req.Timeout = 50 * time.Millisecond
+	start := time.Now()
+	_, err := p.Generate(context.Background(), req)
+	assertUnreachable(t, err, s.URL)
+	if !strings.Contains(err.Error(), llm.ErrTimeout.Error()) {
+		t.Errorf("Error() = %q, want it to say the request timed out", err)
+	}
+	if elapsed := time.Since(start); elapsed > 2*time.Second {
+		t.Fatalf("Request.Timeout not honoured: took %v", elapsed)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
+	defer cancel()
+	_, err = p.ListModels(ctx)
+	assertUnreachable(t, err, s.URL)
+	ctx, cancel = context.WithTimeout(context.Background(), 50*time.Millisecond)
+	defer cancel()
+	assertUnreachable(t, p.Verify(ctx), s.URL)
+
+	ctx, cancel = context.WithCancel(context.Background())
+	cancel()
+	_, err = p.Generate(ctx, schemaRequest())
+	if !errors.Is(err, context.Canceled) || errors.Is(err, llm.ErrTimeout) || strings.Contains(err.Error(), "not reachable") {
+		t.Fatalf("cancelled context: err = %v, want context.Canceled only", err)
+	}
+}
+
+func TestRedirectIsNotFollowed(t *testing.T) {
+	var mu sync.Mutex
+	var secondCalls int
+	second := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		mu.Lock()
+		secondCalls++
+		mu.Unlock()
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(second.Close)
+	first := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		http.Redirect(w, req, second.URL+req.URL.Path, http.StatusFound)
+	}))
+	t.Cleanup(first.Close)
+	p := newProvider(t, first.URL)
+
+	_, genErr := p.Generate(context.Background(), textRequest())
+	verifyErr := p.Verify(context.Background())
+	for _, err := range []error{genErr, verifyErr} {
+		var pe *llm.ProviderError
+		if !errors.Is(err, llm.ErrProvider) || !errors.As(err, &pe) || pe.Status() != http.StatusFound {
+			t.Fatalf("err = %v, want a ProviderError for HTTP 302", err)
+		}
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	if secondCalls != 0 {
+		t.Fatalf("redirect target got %d requests, want 0", secondCalls)
+	}
+}
+
+func TestNewRejectsBadConfig(t *testing.T) {
+	const secret = "hunter2-secret"
+	cases := map[string]string{
+		"empty base":         "",
+		"relative base":      "ollama:11434",
+		"host only":          "192.168.1.20",
+		"ftp base":           "ftp://192.168.1.20:11434",
+		"no host":            "http://",
+		"credentials in URL": "http://user:" + secret + "@192.168.1.20:11434",
+		"user in URL":        "http://" + secret + "@ollama:11434",
+		"secret in query":    "http://ollama:11434/?token=" + secret,
+		"secret in fragment": "http://ollama:11434/#" + secret,
+		"unparseable":        "http://ollama:11434/%zz?token=" + secret,
+		"empty query":        "http://ollama:11434?",
+		"empty fragment":     "http://ollama:11434#",
+		"empty both":         "http://ollama:11434/?#",
+	}
+	for name, base := range cases {
+		_, err := New(Config{BaseURL: base, Model: "llama3.2"})
+		if err == nil {
+			t.Errorf("%s: New() = nil error", name)
+			continue
+		}
+		if strings.Contains(err.Error(), secret) {
+			t.Errorf("%s: error echoes the URL: %v", name, err)
+		}
+	}
+	for _, base := range []string{
+		"http://192.168.1.20:11434",
+		"http://ollama:11434",
+		"http://localhost:11434/",
+		"https://ollama.lan/proxy/",
+	} {
+		if _, err := New(Config{BaseURL: base, Model: "llama3.2"}); err != nil {
+			t.Errorf("New(%q) = %v", base, err)
+		}
+	}
+}
+
+func TestBaseWithPath(t *testing.T) {
+	s := newOllamaServer(t, reply{status: 200, fixture: "tags.json"})
+	if err := newProvider(t, s.URL+"/proxy/").Verify(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if got := s.only(t).path; got != "/proxy/api/tags" {
+		t.Fatalf("path = %s, want /proxy/api/tags", got)
+	}
+}

internal/ai/llm/ollama/testdata/README.md

@@ -0,0 +1,36 @@
+# Ollama adapter fixtures
+
+These are the native Ollama API response bodies the contract tests in
+`ollama_test.go` replay. They are **not live captures**. Product AI is tested
+with fakes and live vendor calls are opt-in, so no request was sent to an
+Ollama server to make them. Each fixture is a sanitized adaptation of the
+response shapes in Ollama's public API documentation
+(<https://github.com/ollama/ollama/blob/main/docs/api.md>):
+
+- Chat, non-streaming: `POST /api/chat` with `"stream": false`.
+- Structured outputs: `POST /api/chat` with a JSON schema in `"format"`.
+- List local models: `GET /api/tags`.
+- Errors: a JSON `{"error": "..."}` body with a non-2xx status; a model
+  that is not pulled is HTTP 404.
+
+Sanitizing:
+
+- Timestamps, durations, sizes, digests and token counts are illustrative
+  values in the documented format, not values from a real server.
+- Message content is replaced with MealQuest dinner text.
+- Ollama takes no credentials, so none appear.
+
+Below, *not in the public example* marks values that were added for a test
+case and do not come from the documented example.
+
+| Fixture | Case | Shape | Not in the public example |
+| --- | --- | --- | --- |
+| `chat_text.json` | Success | Finished chat message, `done_reason: stop`, `prompt_eval_count` and `eval_count`. | — |
+| `chat_schema.json` | Schema output | Finished chat message whose content is a JSON object string. | The dinner object. |
+| `error_model_not_found.json` | Model missing | `{"error": "model \"…\" not found, try pulling it first"}`, served with HTTP 404. | — |
+| `tags.json` | Model list | `{"models": [...]}` with `name`, `model`, `digest` and `details`. | — |
+
+The unreachable-host case has no fixture: there is no response to record.
+The tests close an `httptest` server and dial its address, so the
+connection is refused, and they hold a reply past a short deadline for the
+timeout.

internal/ai/llm/ollama/testdata/chat_schema.json

@@ -0,0 +1,16 @@
+{
+  "model": "llama3.2",
+  "created_at": "2026-10-04T12:20:11.009132Z",
+  "message": {
+    "role": "assistant",
+    "content": "{\"dinners\": [{\"name\": \"Sheet-pan gnocchi\", \"why\": \"Like your Regular tray bake, but quicker.\"}]}"
+  },
+  "done_reason": "stop",
+  "done": true,
+  "total_duration": 1416823291,
+  "load_duration": 12309083,
+  "prompt_eval_count": 147,
+  "prompt_eval_duration": 271802000,
+  "eval_count": 41,
+  "eval_duration": 1130948000
+}

internal/ai/llm/ollama/testdata/chat_text.json

@@ -0,0 +1,16 @@
+{
+  "model": "llama3.2",
+  "created_at": "2026-10-04T12:13:43.416799Z",
+  "message": {
+    "role": "assistant",
+    "content": "Try a crock pot chili: it is a Quick dinner."
+  },
+  "done": true,
+  "done_reason": "stop",
+  "total_duration": 5191566416,
+  "load_duration": 2154458,
+  "prompt_eval_count": 26,
+  "prompt_eval_duration": 383809000,
+  "eval_count": 298,
+  "eval_duration": 4799921000
+}

internal/ai/llm/ollama/testdata/error_model_not_found.json

@@ -0,0 +1 @@
+{"error":"model \"llama9\" not found, try pulling it first"}

internal/ai/llm/ollama/testdata/tags.json

@@ -0,0 +1,34 @@
+{
+  "models": [
+    {
+      "name": "llama3.2:latest",
+      "model": "llama3.2:latest",
+      "modified_at": "2026-09-30T08:06:48.639712648-07:00",
+      "size": 2019393189,
+      "digest": "a80c4f17acd55265feec403c7aef86be0c25983ab279d83f3bcd3abbcb5b8b72",
+      "details": {
+        "parent_model": "",
+        "format": "gguf",
+        "family": "llama",
+        "families": ["llama"],
+        "parameter_size": "3.2B",
+        "quantization_level": "Q4_K_M"
+      }
+    },
+    {
+      "name": "qwen3:8b",
+      "model": "qwen3:8b",
+      "modified_at": "2026-09-28T19:41:02.112408113-07:00",
+      "size": 5225388164,
+      "digest": "500a1f067a9f782620b40bee6f7b0c89e17ae61f686b92c24933e4ca4b2b8b41",
+      "details": {
+        "parent_model": "",
+        "format": "gguf",
+        "family": "qwen3",
+        "families": ["qwen3"],
+        "parameter_size": "8.2B",
+        "quantization_level": "Q4_K_M"
+      }
+    }
+  ]
+}

internal/ai/llm/openai/openai.go

@@ -0,0 +1,632 @@
+// Package openai is the llm.Provider adapter for OpenAI-compatible chat
+// APIs: OpenAI itself, OpenRouter and Ollama's /v1 endpoint. It calls
+// POST {base}/chat/completions and GET {base}/models over plain net/http.
+//
+// The adapter never logs, and no error it returns contains the API key or
+// the Authorization header value: errors do not quote caller- or
+// vendor-supplied text, and every exported method passes its error through
+// redact as a backstop.
+package openai
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"math"
+	"net"
+	"net/http"
+	"net/textproto"
+	"net/url"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+// StructuredOutput is how the adapter asks the vendor for JSON when a
+// Request carries a Schema. Which mode a vendor and model support comes
+// from its preset.
+type StructuredOutput string
+
+const (
+	// JSONSchema sends response_format {type: json_schema, strict: true}
+	// with the Request's schema.
+	JSONSchema StructuredOutput = "json_schema"
+	// JSONObject sends response_format {type: json_object} and puts the
+	// schema in the system prompt.
+	JSONObject StructuredOutput = "json_object"
+	// PromptOnly sends no response_format, puts the schema in the system
+	// prompt and takes the first JSON object found in the reply.
+	PromptOnly StructuredOutput = "prompt_only"
+)
+
+// Config configures a Provider.
+type Config struct {
+	// BaseURL is the API root the endpoint paths are appended to, e.g.
+	// "https://api.openai.com/v1", "https://openrouter.ai/api/v1" or
+	// "http://ollama:11434/v1".
+	BaseURL string
+	// APIKey is sent as "Authorization: Bearer <APIKey>". Empty sends no
+	// Authorization header, for endpoints such as Ollama that need none.
+	// It must not have a control character other than tab.
+	APIKey string
+	// Model is the model Generate requests. ListModels and Verify do not
+	// need it.
+	Model string
+	// Headers are extra request headers, e.g. OpenRouter's HTTP-Referer and
+	// X-Title. An Accept header replaces the default "application/json".
+	// Headers the adapter or net/http set themselves (see managedHeaders)
+	// are rejected.
+	Headers map[string]string
+	// StructuredOutput is how JSON is requested when a Request has a Schema.
+	StructuredOutput StructuredOutput
+}
+
+// Provider is an OpenAI-compatible llm.Provider.
+type Provider struct {
+	base    string
+	apiKey  string
+	model   string
+	headers http.Header
+	mode    StructuredOutput
+	client  *http.Client
+}
+
+var _ llm.Provider = (*Provider)(nil)
+
+// New validates cfg and returns a Provider.
+func New(cfg Config) (*Provider, error) {
+	p, err := newFromConfig(cfg)
+	if err != nil {
+		return nil, redact(err, cfg.APIKey)
+	}
+	return p, nil
+}
+
+func newFromConfig(cfg Config) (*Provider, error) {
+	// Base URL errors never echo the URL: a rejected one may carry a
+	// credential.
+	u, err := url.Parse(cfg.BaseURL)
+	if err != nil {
+		return nil, errors.New("openai: base URL does not parse")
+	}
+	if (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
+		return nil, errors.New("openai: base URL must be an absolute http or https URL")
+	}
+	// A trailing "?" or "#" parses to an empty query or fragment, yet the
+	// endpoint path appended to it would land in the query or fragment.
+	if u.User != nil || strings.ContainsAny(cfg.BaseURL, "?#") {
+		return nil, errors.New("openai: base URL must not carry credentials, a query or a fragment")
+	}
+	if !validHeaderValue(cfg.APIKey) {
+		return nil, errors.New("openai: API key has a control character")
+	}
+	// No error from New quotes caller-supplied text or a name derived from
+	// it: any such text may equal or contain the API key, and redaction
+	// cannot catch a fragment or a case-changed copy of it.
+	switch cfg.StructuredOutput {
+	case JSONSchema, JSONObject, PromptOnly:
+	default:
+		return nil, errors.New("openai: unknown structured output mode")
+	}
+	headers := make(http.Header, len(cfg.Headers)+1)
+	for name, value := range cfg.Headers {
+		if !validHeaderName(name) {
+			return nil, errors.New("openai: an extra header name is not a valid HTTP token")
+		}
+		canonical := textproto.CanonicalMIMEHeaderKey(name)
+		if managedHeaders[canonical] {
+			return nil, errors.New("openai: an extra header is set by the adapter")
+		}
+		if !validHeaderValue(value) {
+			return nil, errors.New("openai: an extra header value has a control character")
+		}
+		headers.Set(canonical, value)
+	}
+	if headers.Get("Accept") == "" {
+		headers.Set("Accept", "application/json")
+	}
+	return &Provider{
+		base:    strings.TrimRight(cfg.BaseURL, "/"),
+		apiKey:  cfg.APIKey,
+		model:   cfg.Model,
+		headers: headers,
+		mode:    cfg.StructuredOutput,
+		client:  noRedirectClient(),
+	}, nil
+}
+
+// managedHeaders are the request headers the adapter or net/http set; a
+// configured value for one would be overwritten or ignored.
+var managedHeaders = map[string]bool{
+	"Authorization":     true,
+	"Content-Type":      true,
+	"Content-Length":    true,
+	"Transfer-Encoding": true,
+	"Host":              true,
+	"Connection":        true,
+}
+
+// validHeaderName reports whether name is an RFC 9110 field-name: a
+// non-empty token of letters, digits and !#$%&'*+-.^_`|~.
+func validHeaderName(name string) bool {
+	if name == "" {
+		return false
+	}
+	for i := 0; i < len(name); i++ {
+		c := name[i]
+		switch {
+		case 'a' <= c && c <= 'z', 'A' <= c && c <= 'Z', '0' <= c && c <= '9':
+		case strings.IndexByte("!#$%&'*+-.^_`|~", c) >= 0:
+		default:
+			return false
+		}
+	}
+	return true
+}
+
+// validHeaderValue reports whether value is an RFC 9110 field-value: no
+// control characters other than horizontal tab, so no CR, LF or DEL.
+func validHeaderValue(value string) bool {
+	for i := 0; i < len(value); i++ {
+		if c := value[i]; (c < 0x20 && c != '\t') || c == 0x7f {
+			return false
+		}
+	}
+	return true
+}
+
+// maxResponseBody caps a successful response body; a larger one is an error.
+const maxResponseBody = 16 << 20
+
+// maxErrorBody caps how much of an error response body is read. It is far
+// above llm.MaxBodyExcerpt, so redaction still sees every secret that could
+// reach the excerpt.
+const maxErrorBody = 64 << 10
+
+type chatMessage struct {
+	Role    string `json:"role"`
+	Content string `json:"content"`
+}
+
+type jsonSchemaFormat struct {
+	Name   string          `json:"name"`
+	Schema json.RawMessage `json:"schema"`
+	Strict bool            `json:"strict"`
+}
+
+type responseFormat struct {
+	Type       string            `json:"type"`
+	JSONSchema *jsonSchemaFormat `json:"json_schema,omitempty"`
+}
+
+type chatRequest struct {
+	Model          string          `json:"model"`
+	Messages       []chatMessage   `json:"messages"`
+	Temperature    *float64        `json:"temperature,omitempty"`
+	MaxTokens      int             `json:"max_tokens,omitempty"`
+	ResponseFormat *responseFormat `json:"response_format,omitempty"`
+}
+
+type chatResponse struct {
+	Model   string `json:"model"`
+	Choices []struct {
+		Message struct {
+			Content *string `json:"content"`
+			Refusal *string `json:"refusal"`
+		} `json:"message"`
+		FinishReason string `json:"finish_reason"`
+	} `json:"choices"`
+	Usage struct {
+		PromptTokens     int `json:"prompt_tokens"`
+		CompletionTokens int `json:"completion_tokens"`
+	} `json:"usage"`
+	Error json.RawMessage `json:"error"`
+}
+
+// schemaInstruction is appended to the system prompt in the json_object and
+// prompt_only modes, where the schema is not sent in response_format.
+const schemaInstruction = "Reply with only a JSON object, and no other text, that matches this JSON Schema:\n"
+
+// Generate sends req to {base}/chat/completions.
+func (p *Provider) Generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	resp, err := p.generate(ctx, req)
+	return resp, redact(err, p.apiKey)
+}
+
+func (p *Provider) generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	if err := req.Validate(); err != nil {
+		return llm.Response{}, fmt.Errorf("openai: generate: %w", err)
+	}
+	if p.model == "" {
+		return llm.Response{}, errors.New("openai: generate: no model configured")
+	}
+	body := chatRequest{
+		Model:       p.model,
+		Temperature: req.Temperature,
+		MaxTokens:   req.MaxTokens,
+	}
+	system := req.System
+	if req.Schema != nil {
+		switch p.mode {
+		case JSONSchema:
+			body.ResponseFormat = &responseFormat{
+				Type:       "json_schema",
+				JSONSchema: &jsonSchemaFormat{Name: req.Schema.Name, Schema: req.Schema.Schema, Strict: true},
+			}
+		case JSONObject:
+			body.ResponseFormat = &responseFormat{Type: "json_object"}
+			system = appendInstruction(system, req.Schema.Schema)
+		case PromptOnly:
+			system = appendInstruction(system, req.Schema.Schema)
+		}
+	}
+	if system != "" {
+		body.Messages = append(body.Messages, chatMessage{Role: "system", Content: system})
+	}
+	for _, m := range req.Messages {
+		body.Messages = append(body.Messages, chatMessage{Role: string(m.Role), Content: m.Content})
+	}
+	payload, err := json.Marshal(body)
+	if err != nil {
+		return llm.Response{}, fmt.Errorf("openai: generate: encode request: %w", err)
+	}
+
+	if req.Timeout > 0 {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(ctx, req.Timeout)
+		defer cancel()
+	}
+	raw, status, err := p.do(ctx, http.MethodPost, "/chat/completions", payload)
+	if err != nil {
+		return llm.Response{}, fmt.Errorf("openai: generate: %w", err)
+	}
+
+	var cr chatResponse
+	if err := json.Unmarshal(raw, &cr); err != nil {
+		return llm.Response{}, fmt.Errorf("openai: generate: decode response: %w", err)
+	}
+	if len(cr.Error) > 0 && string(cr.Error) != "null" {
+		// OpenRouter can report an upstream failure in a 2xx body.
+		return llm.Response{}, fmt.Errorf("openai: generate: %w", llm.NewProviderError(status, raw, p.apiKey))
+	}
+	if len(cr.Choices) == 0 {
+		return llm.Response{}, errors.New("openai: generate: response has no choices")
+	}
+	choice := cr.Choices[0]
+	resp := llm.Response{
+		Usage:        llm.Usage{InputTokens: cr.Usage.PromptTokens, OutputTokens: cr.Usage.CompletionTokens},
+		Model:        cr.Model,
+		FinishReason: choice.FinishReason,
+	}
+	if choice.Message.Content != nil {
+		resp.Text = *choice.Message.Content
+	}
+	if req.Schema == nil {
+		return resp, nil
+	}
+	if choice.Message.Refusal != nil && *choice.Message.Refusal != "" {
+		return resp, fmt.Errorf("openai: generate: model refused the structured request: %w", llm.ErrBadOutput)
+	}
+	if p.mode == PromptOnly {
+		resp.JSON = firstJSONObject(resp.Text)
+	} else if text := strings.TrimSpace(resp.Text); isJSONObject(text) {
+		resp.JSON = json.RawMessage(text)
+	}
+	if resp.JSON == nil {
+		return resp, fmt.Errorf("openai: generate: reply holds no JSON object: %w", llm.ErrBadOutput)
+	}
+	return resp, nil
+}
+
+func appendInstruction(system string, schema json.RawMessage) string {
+	instruction := schemaInstruction + string(schema)
+	if system == "" {
+		return instruction
+	}
+	return system + "\n\n" + instruction
+}
+
+// isJSONObject reports whether s is exactly one JSON object.
+func isJSONObject(s string) bool {
+	return strings.HasPrefix(s, "{") && json.Valid([]byte(s))
+}
+
+// firstJSONObject returns the first complete JSON object in s, trying each
+// "{" in order, or nil when there is none. Text around it, such as prose or
+// a Markdown code fence, is ignored.
+func firstJSONObject(s string) json.RawMessage {
+	for i := strings.IndexByte(s, '{'); i >= 0; {
+		var obj json.RawMessage
+		if err := json.NewDecoder(strings.NewReader(s[i:])).Decode(&obj); err == nil {
+			return obj
+		}
+		next := strings.IndexByte(s[i+1:], '{')
+		if next < 0 {
+			break
+		}
+		i += 1 + next
+	}
+	return nil
+}
+
+type modelsResponse struct {
+	Data []struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+	} `json:"data"`
+}
+
+// ListModels returns the models {base}/models lists.
+func (p *Provider) ListModels(ctx context.Context) ([]llm.Model, error) {
+	models, err := p.listModels(ctx)
+	return models, redact(err, p.apiKey)
+}
+
+func (p *Provider) listModels(ctx context.Context) ([]llm.Model, error) {
+	raw, _, err := p.do(ctx, http.MethodGet, "/models", nil)
+	if err != nil {
+		return nil, fmt.Errorf("openai: list models: %w", err)
+	}
+	var mr modelsResponse
+	if err := json.Unmarshal(raw, &mr); err != nil {
+		return nil, fmt.Errorf("openai: list models: decode response: %w", err)
+	}
+	if mr.Data == nil {
+		return nil, errors.New("openai: list models: response has no data list")
+	}
+	models := make([]llm.Model, 0, len(mr.Data))
+	for i, m := range mr.Data {
+		if m.ID == "" {
+			return nil, fmt.Errorf("openai: list models: model %d has no id", i)
+		}
+		name := m.Name
+		if name == "" {
+			name = m.ID
+		}
+		models = append(models, llm.Model{ID: m.ID, DisplayName: name})
+	}
+	return models, nil
+}
+
+// Verify checks the credentials with an authenticated ListModels call.
+func (p *Provider) Verify(ctx context.Context) error {
+	_, err := p.listModels(ctx)
+	return redact(err, p.apiKey)
+}
+
+// do sends one request and returns the body and status of a 2xx response.
+// Any other status becomes the matching llm typed error.
+func (p *Provider) do(ctx context.Context, method, path string, payload []byte) ([]byte, int, error) {
+	var reqBody io.Reader
+	if payload != nil {
+		reqBody = bytes.NewReader(payload)
+	}
+	httpReq, err := http.NewRequestWithContext(ctx, method, p.base+path, reqBody)
+	if err != nil {
+		// The parse error names the URL, whose path may hold the API key.
+		return nil, 0, errors.New("build request: request URL is invalid")
+	}
+	for name, values := range p.headers {
+		httpReq.Header[name] = values
+	}
+	if payload != nil {
+		httpReq.Header.Set("Content-Type", "application/json")
+	}
+	if p.apiKey != "" {
+		httpReq.Header.Set("Authorization", "Bearer "+p.apiKey)
+	}
+
+	httpResp, err := p.client.Do(httpReq)
+	if err != nil {
+		return nil, 0, p.transportError(err)
+	}
+	defer httpResp.Body.Close()
+
+	if httpResp.StatusCode < 200 || httpResp.StatusCode > 299 {
+		body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxErrorBody))
+		if err != nil {
+			return nil, httpResp.StatusCode, p.transportError(err)
+		}
+		return nil, httpResp.StatusCode, p.statusError(httpResp, body)
+	}
+	body, err := io.ReadAll(io.LimitReader(httpResp.Body, maxResponseBody+1))
+	if err != nil {
+		return nil, httpResp.StatusCode, p.transportError(err)
+	}
+	if len(body) > maxResponseBody {
+		return nil, httpResp.StatusCode, fmt.Errorf("response body exceeds %d bytes", maxResponseBody)
+	}
+	return body, httpResp.StatusCode, nil
+}
+
+// statusError maps a non-2xx response to an llm typed error.
+func (p *Provider) statusError(resp *http.Response, body []byte) error {
+	switch resp.StatusCode {
+	case http.StatusUnauthorized, http.StatusForbidden:
+		return fmt.Errorf("HTTP %d: %w", resp.StatusCode, llm.ErrAuth)
+	case http.StatusTooManyRequests:
+		return llm.NewRateLimitedError(retryAfter(resp.Header.Get("Retry-After"), time.Now()), p.apiKey)
+	case http.StatusRequestTimeout:
+		return llm.NewTimeoutStatusError(resp.StatusCode, p.apiKey)
+	default:
+		return llm.NewProviderError(resp.StatusCode, body, p.apiKey)
+	}
+}
+
+// retryAfter parses a Retry-After header, in delay-seconds or HTTP-date
+// form. A missing, malformed or past value means the vendor gave no usable
+// wait, reported as 0.
+func retryAfter(value string, now time.Time) time.Duration {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return 0
+	}
+	if secs, err := strconv.ParseInt(value, 10, 64); err == nil || errors.Is(err, strconv.ErrRange) {
+		if secs < 0 {
+			return 0
+		}
+		// time.Duration counts nanoseconds in an int64; a larger wait is
+		// capped to the most whole seconds it holds instead of overflowing.
+		if secs > maxRetryAfterSeconds {
+			secs = maxRetryAfterSeconds
+		}
+		return time.Duration(secs) * time.Second
+	}
+	if at, err := http.ParseTime(value); err == nil && at.After(now) {
+		return at.Sub(now).Round(time.Second)
+	}
+	return 0
+}
+
+// maxRetryAfterSeconds is the largest delay-seconds value retryAfter
+// returns unchanged: the most whole seconds a time.Duration holds.
+const maxRetryAfterSeconds = math.MaxInt64 / int64(time.Second)
+
+// noRedirectClient returns an HTTP client that never follows a redirect.
+// A followed redirect would resend the credential headers, which net/http
+// strips only for its own list of sensitive headers and only across hosts;
+// instead the 3xx response is returned and becomes a provider error.
+func noRedirectClient() *http.Client {
+	return &http.Client{
+		CheckRedirect: func(*http.Request, []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+}
+
+func isTimeout(err error) bool {
+	var ne net.Error
+	return errors.Is(err, context.DeadlineExceeded) || (errors.As(err, &ne) && ne.Timeout())
+}
+
+// transportFailure is a failed HTTP exchange. It carries the cause's text
+// with the request URL removed and the API key redacted, and unwraps only to
+// the cause's category: llm.ErrTimeout, context.Canceled or nothing.
+type transportFailure struct {
+	text string
+	kind error
+}
+
+func (e *transportFailure) Error() string { return e.text }
+
+// GoString keeps %#v to the redacted Error text instead of the fields.
+func (e *transportFailure) GoString() string { return e.text }
+
+func (e *transportFailure) Unwrap() error { return e.kind }
+
+// transportError reports a failure to complete the HTTP exchange. A
+// *url.Error names the request URL, and a base URL path may hold the API
+// key, so only the wrapped cause is kept, rendered with the key redacted.
+func (p *Provider) transportError(err error) error {
+	var kind error
+	switch {
+	case isTimeout(err):
+		kind = llm.ErrTimeout
+	case errors.Is(err, context.Canceled):
+		kind = context.Canceled
+	}
+	var ue *url.Error
+	if errors.As(err, &ue) {
+		err = ue.Err
+	}
+	text := "transport: " + err.Error()
+	if kind == llm.ErrTimeout {
+		text = fmt.Sprintf("%s: %s", llm.ErrTimeout, text)
+	}
+	return &transportFailure{text: llm.Redact(text, p.apiKey), kind: kind}
+}
+
+// redactedError stands in for one layer of an error chain that holds the
+// API key. Its text is the layer's text with the key redacted, and Unwrap
+// returns the layer's causes passed through redact, so no error reached by
+// unwrapping has text holding the key. Is consults the original layer and
+// its chain, so sentinels still match. As does too. The llm typed errors
+// remove the key from their own complete text, fixed words included, so
+// they always match; As refuses a match whose text, or whose %#v form,
+// holds the key, so it never hands back an error that can print it.
+type redactedError struct {
+	text string
+	err  error
+	key  string
+}
+
+func (e *redactedError) Error() string { return e.text }
+
+// GoString keeps %#v from printing the fields, which hold the key.
+func (e *redactedError) GoString() string { return e.text }
+
+func (e *redactedError) Unwrap() error { return redact(errors.Unwrap(e.err), e.key) }
+
+func (e *redactedError) Is(target error) bool { return errors.Is(e.err, target) }
+
+func (e *redactedError) As(target any) bool {
+	if !errors.As(e.err, target) {
+		return false
+	}
+	found := reflect.ValueOf(target).Elem()
+	matched, isErr := found.Interface().(error)
+	if (isErr && holdsKey(matched, e.key)) || strings.Contains(fmt.Sprintf("%#v", found.Interface()), e.key) {
+		found.SetZero()
+		return false
+	}
+	return true
+}
+
+// redactedJoin is redactedError for a layer with several causes, such as
+// one built by errors.Join or by fmt.Errorf with more than one %w.
+type redactedJoin struct {
+	redactedError
+}
+
+func (e *redactedJoin) Unwrap() []error {
+	causes := e.err.(interface{ Unwrap() []error }).Unwrap()
+	safe := make([]error, len(causes))
+	for i, c := range causes {
+		safe[i] = redact(c, e.key)
+	}
+	return safe
+}
+
+// redact is the backstop every exported method applies to its error: with
+// a non-empty key, it returns a stand-in whose text, and the text of every
+// error it unwraps to, has the key redacted. Every non-nil err is wrapped,
+// even one whose text lacks the key, because %#v of an unwrapped error
+// prints its struct field names, and a key may spell one.
+func redact(err error, key string) error {
+	if err == nil || key == "" {
+		return err
+	}
+	re := redactedError{text: llm.Redact(err.Error(), key), err: err, key: key}
+	if _, ok := err.(interface{ Unwrap() []error }); ok {
+		return &redactedJoin{re}
+	}
+	return &re
+}
+
+// holdsKey reports whether the text of err or of any error in its chain
+// contains key.
+func holdsKey(err error, key string) bool {
+	if err == nil {
+		return false
+	}
+	if strings.Contains(err.Error(), key) {
+		return true
+	}
+	switch u := err.(type) {
+	case interface{ Unwrap() error }:
+		return holdsKey(u.Unwrap(), key)
+	case interface{ Unwrap() []error }:
+		for _, c := range u.Unwrap() {
+			if holdsKey(c, key) {
+				return true
+			}
+		}
+	}
+	return false
+}

internal/ai/llm/openai/testdata/README.md

@@ -0,0 +1,71 @@
+# OpenAI-compatible adapter fixtures
+
+These are the vendor response bodies the contract tests in `openai_test.go`
+replay. They are **not live captures**. Product AI is tested with fakes, and
+live vendor calls are opt-in and never use credentials, so no request was
+sent to a vendor to make them. Each fixture is adapted from the response
+shape in that vendor's public API documentation or open source, then
+sanitized:
+
+- IDs, timestamps, fingerprints and token counts are illustrative values in
+  the documented format, not values from a real account.
+- Message content is replaced with MealQuest dinner text.
+- No real credential appears anywhere. `{{KEY}}` is a placeholder the tests
+  replace with a fake key, to prove the adapter redacts a key echoed back in
+  a vendor body.
+
+The tests check the adapter against these bodies with independent
+assertions on both the request sent (path, headers, `response_format`,
+messages) and the response decoded. The request side does not depend on the
+fixtures.
+
+Below, *not in the public example* marks fields or values that were added
+for a test case and do not come from the vendor's documented example.
+
+## OpenAI
+
+Sources: API reference, "The chat completion object" and "List models"
+(<https://platform.openai.com/docs/api-reference/chat/object>,
+<https://platform.openai.com/docs/api-reference/models/list>); the
+Structured Outputs guide, for `refusal`
+(<https://platform.openai.com/docs/guides/structured-outputs>); and the error
+codes guide (<https://platform.openai.com/docs/guides/error-codes>).
+
+| Fixture | Shape | Not in the public example |
+| --- | --- | --- |
+| `openai_chat_json_schema.json` | Chat completion object with `usage` details, `service_tier`, `system_fingerprint`. | The JSON reply content. |
+| `openai_chat_refusal.json` | Structured Outputs refusal: `content: null`, `refusal` set. | — |
+| `openai_models.json` | `{object: list, data: [model]}`. | — |
+| `openai_error_invalid_key.json` | Error object, `code: invalid_api_key`, message echoing the key. | The full key in the message; OpenAI masks most of it. Kept whole to test redaction. |
+| `openai_error_server.json` | Error object, `type: server_error`. | The `Authorization: Bearer {{KEY}}` text; added to test redaction. |
+
+## OpenRouter
+
+Sources: API reference, chat completion response and errors
+(<https://openrouter.ai/docs/api-reference/overview>,
+<https://openrouter.ai/docs/api-reference/errors>), and "List available
+models" (<https://openrouter.ai/docs/api-reference/list-available-models>).
+
+| Fixture | Shape | Not in the public example |
+| --- | --- | --- |
+| `openrouter_chat_json_object.json` | Chat completion with `provider`, `native_finish_reason` and `message.reasoning`. | The JSON reply content. |
+| `openrouter_chat_upstream_error.json` | An `error` object (`code`, `message`, `metadata.provider_name`, `metadata.raw`) in an HTTP 200 body, which OpenRouter documents for upstream failures. | `user_id`. |
+| `openrouter_error_rate_limited.json` | Error object, `code: 429`, rate-limit `metadata`. | The `Key {{KEY}}` text; added to test redaction. |
+| `openrouter_models.json` | `{data: [model]}` with `name`, `context_length`, `architecture`, `pricing`, `supported_parameters`. | The second model is a minimal entry, to test optional fields. |
+
+## Ollama
+
+Ollama's OpenAI compatibility page
+(<https://github.com/ollama/ollama/blob/main/docs/openai.md>) documents
+requests but shows no response bodies. The shapes come from its `openai`
+middleware source (<https://github.com/ollama/ollama/blob/main/openai/openai.go>):
+`chatcmpl-<n>` IDs, `system_fingerprint: fp_ollama`, `owned_by: library` on
+models, and errors as `{error: {message, type: api_error, param, code}}`.
+
+| Fixture | Shape | Not in the public example |
+| --- | --- | --- |
+| `ollama_chat_text.json` | Plain chat completion. | — |
+| `ollama_chat_prompt_only.json` | Chat completion. | The reply text: prose and stray braces around a fenced JSON object, to test prompt-only extraction. |
+| `ollama_chat_truncated.json` | Chat completion with `finish_reason: length`. | The cut-off JSON reply. |
+| `ollama_models.json` | `{object: list, data: [model]}`. | — |
+| `ollama_error_not_found.json` | Middleware error object for a missing model. | — |

internal/ai/llm/openai/testdata/ollama_chat_prompt_only.json

@@ -0,0 +1,18 @@
+{
+  "id": "chatcmpl-417",
+  "object": "chat.completion",
+  "created": 1741570322,
+  "model": "llama3.2",
+  "system_fingerprint": "fp_ollama",
+  "choices": [
+    {
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "Sure! Here is a dinner {idea} for you:\n```json\n{\"dinners\": [{\"name\": \"Crock pot chili\", \"why\": \"A Quick dinner like your {Regular} stew.\"}]}\n```\nEnjoy {\"not\": \"this one\"}!"
+      },
+      "finish_reason": "stop"
+    }
+  ],
+  "usage": {"prompt_tokens": 512, "completion_tokens": 58, "total_tokens": 570}
+}

internal/ai/llm/openai/testdata/ollama_chat_text.json

@@ -0,0 +1,11 @@
+{
+  "id": "chatcmpl-419",
+  "object": "chat.completion",
+  "created": 1741570340,
+  "model": "llama3.2",
+  "system_fingerprint": "fp_ollama",
+  "choices": [
+    {"index": 0, "message": {"role": "assistant", "content": "Try a lemon orzo bake tonight."}, "finish_reason": "stop"}
+  ],
+  "usage": {"prompt_tokens": 40, "completion_tokens": 9, "total_tokens": 49}
+}

internal/ai/llm/openai/testdata/ollama_chat_truncated.json

@@ -0,0 +1,15 @@
+{
+  "id": "chatcmpl-418",
+  "object": "chat.completion",
+  "created": 1741570330,
+  "model": "llama3.2",
+  "system_fingerprint": "fp_ollama",
+  "choices": [
+    {
+      "index": 0,
+      "message": {"role": "assistant", "content": "{\"dinners\": [{\"name\": \"Crock pot ch"},
+      "finish_reason": "length"
+    }
+  ],
+  "usage": {"prompt_tokens": 512, "completion_tokens": 16, "total_tokens": 528}
+}

internal/ai/llm/openai/testdata/ollama_error_not_found.json

@@ -0,0 +1 @@
+{"error": {"message": "model \"llama9\" not found, try pulling it first", "type": "api_error", "param": null, "code": null}}

internal/ai/llm/openai/testdata/ollama_models.json

@@ -0,0 +1,7 @@
+{
+  "object": "list",
+  "data": [
+    {"id": "llama3.2:latest", "object": "model", "created": 1741000000, "owned_by": "library"},
+    {"id": "qwen2.5:7b", "object": "model", "created": 1740000000, "owned_by": "library"}
+  ]
+}

internal/ai/llm/openai/testdata/openai_chat_json_schema.json

@@ -0,0 +1,28 @@
+{
+  "id": "chatcmpl-B9MHDbslfkBeAs8l4bebGdFOJ6PeG",
+  "object": "chat.completion",
+  "created": 1741570283,
+  "model": "gpt-4o-2024-08-06",
+  "choices": [
+    {
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "{\"dinners\":[{\"name\":\"Sheet-pan gnocchi\",\"why\":\"Like your Regular tray bake, but quicker.\"}]}",
+        "refusal": null,
+        "annotations": []
+      },
+      "logprobs": null,
+      "finish_reason": "stop"
+    }
+  ],
+  "usage": {
+    "prompt_tokens": 1117,
+    "completion_tokens": 46,
+    "total_tokens": 1163,
+    "prompt_tokens_details": {"cached_tokens": 0, "audio_tokens": 0},
+    "completion_tokens_details": {"reasoning_tokens": 0, "audio_tokens": 0, "accepted_prediction_tokens": 0, "rejected_prediction_tokens": 0}
+  },
+  "service_tier": "default",
+  "system_fingerprint": "fp_fc9f1d7035"
+}

internal/ai/llm/openai/testdata/openai_chat_refusal.json

@@ -0,0 +1,16 @@
+{
+  "id": "chatcmpl-B9MHDbslfkBeAs8l4bebGdFOJ6PeH",
+  "object": "chat.completion",
+  "created": 1741570290,
+  "model": "gpt-4o-2024-08-06",
+  "choices": [
+    {
+      "index": 0,
+      "message": {"role": "assistant", "content": null, "refusal": "I'm sorry, I can't help with that request.", "annotations": []},
+      "logprobs": null,
+      "finish_reason": "stop"
+    }
+  ],
+  "usage": {"prompt_tokens": 210, "completion_tokens": 11, "total_tokens": 221},
+  "system_fingerprint": "fp_fc9f1d7035"
+}

internal/ai/llm/openai/testdata/openai_error_invalid_key.json

@@ -0,0 +1,8 @@
+{
+  "error": {
+    "message": "Incorrect API key provided: {{KEY}}. You can find your API key at https://platform.openai.com/account/api-keys.",
+    "type": "invalid_request_error",
+    "param": null,
+    "code": "invalid_api_key"
+  }
+}

internal/ai/llm/openai/testdata/openai_error_server.json

@@ -0,0 +1 @@
+{"error": {"message": "The server had an error while processing your request. Authorization: Bearer {{KEY}}", "type": "server_error", "param": null, "code": null}}

internal/ai/llm/openai/testdata/openai_models.json

@@ -0,0 +1,7 @@
+{
+  "object": "list",
+  "data": [
+    {"id": "gpt-4o-2024-08-06", "object": "model", "created": 1722814719, "owned_by": "system"},
+    {"id": "gpt-4o-mini", "object": "model", "created": 1721172741, "owned_by": "system"}
+  ]
+}

internal/ai/llm/openai/testdata/openrouter_chat_json_object.json

@@ -0,0 +1,22 @@
+{
+  "id": "gen-1741570300-xQmT9vWb4kR2nP7sL3aE",
+  "provider": "OpenAI",
+  "model": "openai/gpt-4o-mini",
+  "object": "chat.completion",
+  "created": 1741570300,
+  "choices": [
+    {
+      "logprobs": null,
+      "finish_reason": "stop",
+      "native_finish_reason": "stop",
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "{\n  \"dinners\": [{\"name\": \"Chicken tinga tacos\", \"why\": \"Close to your taco-night Regular.\"}]\n}",
+        "refusal": null,
+        "reasoning": null
+      }
+    }
+  ],
+  "usage": {"prompt_tokens": 842, "completion_tokens": 31, "total_tokens": 873}
+}

internal/ai/llm/openai/testdata/openrouter_chat_upstream_error.json

@@ -0,0 +1,5 @@
+{
+  "id": "gen-1741570311-aB3dE5fG7hJ9kL1mN2pQ",
+  "error": {"code": 502, "message": "Upstream error from provider", "metadata": {"provider_name": "Lambda", "raw": "upstream returned 502"}},
+  "user_id": "user_2abcDEF"
+}

internal/ai/llm/openai/testdata/openrouter_error_rate_limited.json

@@ -0,0 +1 @@
+{"error": {"code": 429, "message": "Rate limit exceeded: free-models-per-min. Key {{KEY}}", "metadata": {"headers": {"X-RateLimit-Limit": "20", "X-RateLimit-Remaining": "0"}}}}

internal/ai/llm/openai/testdata/openrouter_models.json

@@ -0,0 +1,22 @@
+{
+  "data": [
+    {
+      "id": "openai/gpt-4o-mini",
+      "canonical_slug": "openai/gpt-4o-mini",
+      "name": "OpenAI: GPT-4o-mini",
+      "created": 1721260800,
+      "description": "GPT-4o mini is OpenAI's newest model after GPT-4 Omni.",
+      "context_length": 128000,
+      "architecture": {"modality": "text+image->text", "input_modalities": ["text", "image"], "output_modalities": ["text"], "tokenizer": "GPT"},
+      "pricing": {"prompt": "0.00000015", "completion": "0.0000006"},
+      "supported_parameters": ["max_tokens", "temperature", "response_format", "structured_outputs"]
+    },
+    {
+      "id": "anthropic/claude-sonnet-5",
+      "name": "Anthropic: Claude Sonnet 5",
+      "created": 1767225600,
+      "context_length": 200000,
+      "supported_parameters": ["max_tokens", "temperature"]
+    }
+  ]
+}

internal/ai/llm/presets/presets.go

@@ -0,0 +1,329 @@
+// Package presets holds what MealQuest knows about each language-model
+// vendor — base URL, adapter, credentials, headers, structured output mode
+// and model quirks — and FromSettings, which turns the household's
+// llm.Settings into a ready llm.Provider.
+//
+// FromSettings lives here rather than in package llm because it builds the
+// adapters, and every adapter imports llm.
+//
+// Nothing in this package logs, and no error it returns or unwraps to
+// contains the API key, even where the key equals a setting's or request's
+// value or text the error spells anyway.
+package presets
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math"
+	"regexp"
+	"slices"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm/anthropic"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm/ollama"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm/openai"
+)
+
+// Adapter names the llm adapter package a preset builds.
+type Adapter string
+
+// The adapters.
+const (
+	AdapterAnthropic Adapter = "anthropic"
+	AdapterOpenAI    Adapter = "openai"
+	AdapterOllama    Adapter = "ollama"
+)
+
+// KeyPolicy is whether a preset sends an API key.
+type KeyPolicy int
+
+// The key policies.
+const (
+	// KeyRequired presets fail without a key.
+	KeyRequired KeyPolicy = iota
+	// KeyOptional presets send a key when one is given.
+	KeyOptional
+	// KeyNone presets send no key and refuse one.
+	KeyNone
+)
+
+// The reasoning models that reject the temperature field are OpenAI's o1
+// and o3 families: the bare family name or the name followed by a "-"
+// variant (o1, o1-mini, o3-2025-04-16), never a longer word such as o123.
+// OpenRouter names them with an "openai/" prefix and may add a ":" variant
+// (openai/o1:online). A preset whose OmitTemperature holds a pattern never
+// sends a temperature to a matching model.
+var (
+	openAIReasoningModels     = regexp.MustCompile(`^o[13](-.*)?$`)
+	openRouterReasoningModels = regexp.MustCompile(`^openai/o[13]([-:].*)?$`)
+)
+
+// Preset is one vendor's fixed configuration.
+type Preset struct {
+	// Name is the Settings.Provider value that selects the preset.
+	Name string
+	// Adapter is the adapter the preset builds.
+	Adapter Adapter
+	// BaseURL is the API root the adapter appends its endpoint paths to.
+	// Empty means the household must supply it in Settings.BaseURL.
+	BaseURL string
+	// Key is whether the preset sends an API key.
+	Key KeyPolicy
+	// RequiresPublicURL means the preset needs Settings.PublicURL for its
+	// headers.
+	RequiresPublicURL bool
+	// Headers returns the extra request headers an openai-adapter preset
+	// sends; nil means none.
+	Headers func(llm.Settings) map[string]string
+	// StructuredOutput is the default mode of an openai-adapter preset.
+	StructuredOutput openai.StructuredOutput
+	// FallbackStructuredOutput is the mode the household can select when
+	// the default fails for its model; empty means none. FromSettings
+	// builds one mode and never retries a request in another.
+	FallbackStructuredOutput openai.StructuredOutput
+	// StructuredOutputs are the modes Settings.StructuredOutput may select.
+	StructuredOutputs []openai.StructuredOutput
+	// MaxTokens is the max_tokens the anthropic adapter sends when a
+	// Request sets none.
+	MaxTokens int
+	// OmitTemperature are model-id patterns the preset never sends a
+	// temperature to.
+	OmitTemperature []*regexp.Regexp
+}
+
+// openRouterHeaders identify MealQuest to OpenRouter: HTTP-Referer is
+// MEALQUEST_PUBLIC_URL and X-Title is the app name.
+func openRouterHeaders(s llm.Settings) map[string]string {
+	return map[string]string{
+		"HTTP-Referer": s.PublicURL,
+		"X-Title":      "MealQuest",
+	}
+}
+
+// omitsTemperature reports whether model matches one of the preset's
+// OmitTemperature patterns.
+func (p Preset) omitsTemperature(model string) bool {
+	return slices.ContainsFunc(p.OmitTemperature, func(re *regexp.Regexp) bool {
+		return re.MatchString(model)
+	})
+}
+
+// Lookup returns the preset Settings.Provider name selects.
+func Lookup(name string) (Preset, bool) {
+	p, ok := all[name]
+	return p, ok
+}
+
+// all is every preset, by Settings.Provider name.
+var all = map[string]Preset{
+	"anthropic": {
+		Name:      "anthropic",
+		Adapter:   AdapterAnthropic,
+		BaseURL:   "https://api.anthropic.com",
+		Key:       KeyRequired,
+		MaxTokens: 4096,
+	},
+	"openai": {
+		Name:              "openai",
+		Adapter:           AdapterOpenAI,
+		BaseURL:           "https://api.openai.com/v1",
+		Key:               KeyRequired,
+		StructuredOutput:  openai.JSONSchema,
+		StructuredOutputs: []openai.StructuredOutput{openai.JSONSchema},
+		OmitTemperature:   []*regexp.Regexp{openAIReasoningModels},
+	},
+	"openrouter": {
+		Name:                     "openrouter",
+		Adapter:                  AdapterOpenAI,
+		BaseURL:                  "https://openrouter.ai/api/v1",
+		Key:                      KeyRequired,
+		RequiresPublicURL:        true,
+		Headers:                  openRouterHeaders,
+		StructuredOutput:         openai.JSONSchema,
+		FallbackStructuredOutput: openai.JSONObject,
+		StructuredOutputs:        []openai.StructuredOutput{openai.JSONSchema, openai.JSONObject},
+		OmitTemperature:          []*regexp.Regexp{openRouterReasoningModels},
+	},
+	"xai": {
+		Name:                     "xai",
+		Adapter:                  AdapterOpenAI,
+		BaseURL:                  "https://api.x.ai/v1",
+		Key:                      KeyRequired,
+		StructuredOutput:         openai.JSONSchema,
+		FallbackStructuredOutput: openai.JSONObject,
+		StructuredOutputs:        []openai.StructuredOutput{openai.JSONSchema, openai.JSONObject},
+	},
+	"ollama": {
+		Name:    "ollama",
+		Adapter: AdapterOllama,
+		Key:     KeyNone,
+	},
+	"openai_compatible": {
+		Name:              "openai_compatible",
+		Adapter:           AdapterOpenAI,
+		Key:               KeyOptional,
+		StructuredOutput:  openai.JSONSchema,
+		StructuredOutputs: []openai.StructuredOutput{openai.JSONSchema, openai.JSONObject, openai.PromptOnly},
+		// The server may be OpenAI itself or a gateway that names models
+		// the OpenRouter way.
+		OmitTemperature: []*regexp.Regexp{openAIReasoningModels, openRouterReasoningModels},
+	},
+}
+
+// FromSettings returns the Provider s describes, using key as its API key.
+// It fails with a configuration error from package llm — ErrUnknownProvider,
+// ErrMissingKey, ErrUnexpectedKey, ErrInvalidKey, ErrMissingBaseURL, ErrMissingModel,
+// ErrMissingPublicURL or ErrInvalidSetting — before contacting any vendor.
+//
+// The Provider sends s.Temperature with every request whose Temperature is
+// nil; a request that sets one keeps it. Neither is sent to a model the
+// preset's OmitTemperature matches. It is wrapped in llm.NewRetrying, so
+// Generate retries transient vendor failures and has the default timeout.
+func FromSettings(s llm.Settings, key string) (llm.Provider, error) {
+	cp, err := fromSettings(s, key)
+	if err != nil {
+		return nil, redact(err, key)
+	}
+	return llm.NewRetrying(cp), nil
+}
+
+func fromSettings(s llm.Settings, key string) (*configured, error) {
+	p, ok := Lookup(s.Provider)
+	if !ok {
+		return nil, llm.ErrUnknownProvider
+	}
+	if err := check(p, s, key); err != nil {
+		return nil, fmt.Errorf("%s: %w", p.Name, err)
+	}
+	base := p.BaseURL
+	if base == "" {
+		base = s.BaseURL
+	}
+
+	var inner llm.Provider
+	var err error
+	switch p.Adapter {
+	case AdapterAnthropic:
+		inner, err = anthropic.New(anthropic.Config{BaseURL: base, APIKey: key, Model: s.Model, MaxTokens: p.MaxTokens})
+	case AdapterOllama:
+		inner, err = ollama.New(ollama.Config{BaseURL: base, Model: s.Model})
+	case AdapterOpenAI:
+		mode := p.StructuredOutput
+		if s.StructuredOutput != "" {
+			mode = openai.StructuredOutput(s.StructuredOutput)
+		}
+		cfg := openai.Config{BaseURL: base, APIKey: key, Model: s.Model, StructuredOutput: mode}
+		if p.Headers != nil {
+			cfg.Headers = p.Headers(s)
+		}
+		inner, err = openai.New(cfg)
+	default:
+		panic("presets: preset " + p.Name + " has unknown adapter " + string(p.Adapter))
+	}
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w: %w", p.Name, llm.ErrInvalidSetting, err)
+	}
+
+	cp := &configured{Provider: inner, key: key}
+	if !p.omitsTemperature(s.Model) {
+		t := s.Temperature
+		cp.temperature = &t
+	}
+	return cp, nil
+}
+
+// check validates s and key against p. Its errors never quote a value.
+func check(p Preset, s llm.Settings, key string) error {
+	switch {
+	case p.Key == KeyRequired && key == "":
+		return llm.ErrMissingKey
+	case p.Key == KeyNone && key != "":
+		return llm.ErrUnexpectedKey
+	case !validHeaderValue(key):
+		return llm.ErrInvalidKey
+	}
+	switch {
+	case p.BaseURL == "" && s.BaseURL == "":
+		return llm.ErrMissingBaseURL
+	case p.BaseURL != "" && s.BaseURL != "" && s.BaseURL != p.BaseURL:
+		return fmt.Errorf("%w: base URL is fixed by the preset", llm.ErrInvalidSetting)
+	}
+	if s.Model == "" {
+		return llm.ErrMissingModel
+	}
+	if p.RequiresPublicURL && s.PublicURL == "" {
+		return llm.ErrMissingPublicURL
+	}
+	if s.StructuredOutput != "" && !slices.Contains(p.StructuredOutputs, openai.StructuredOutput(s.StructuredOutput)) {
+		return fmt.Errorf("%w: structured output mode is not supported by the preset", llm.ErrInvalidSetting)
+	}
+	if math.IsNaN(s.Temperature) || math.IsInf(s.Temperature, 0) || s.Temperature < 0 {
+		return fmt.Errorf("%w: temperature must be a non-negative number", llm.ErrInvalidSetting)
+	}
+	return nil
+}
+
+// validHeaderValue reports whether value has no control character other
+// than tab, so it can be sent as an HTTP header value.
+func validHeaderValue(value string) bool {
+	for i := 0; i < len(value); i++ {
+		if c := value[i]; (c < 0x20 && c != '\t') || c == 0x7f {
+			return false
+		}
+	}
+	return true
+}
+
+// configured applies the household temperature and the preset's
+// temperature quirk to every Generate.
+type configured struct {
+	llm.Provider
+	// key is the API key, redacted from validation errors; the adapter
+	// redacts its own.
+	key string
+	// temperature is sent when a request sets none; nil means the model
+	// rejects temperature, so none is ever sent.
+	temperature *float64
+}
+
+// Generate validates req as sent by the caller before changing its
+// temperature, so clearing it for a model that rejects temperature never
+// hides an invalid one.
+func (c *configured) Generate(ctx context.Context, req llm.Request) (llm.Response, error) {
+	if err := req.Validate(); err != nil {
+		return llm.Response{}, redact(fmt.Errorf("presets: generate: %w", err), c.key)
+	}
+	if c.temperature == nil {
+		req.Temperature = nil
+	} else if req.Temperature == nil {
+		t := *c.temperature
+		req.Temperature = &t
+	}
+	return c.Provider.Generate(ctx, req)
+}
+
+// redactedError is an error with the API key removed from its text. It
+// does not unwrap, because every layer below may hold the key; Is still
+// matches the sentinels the original error wraps.
+type redactedError struct {
+	text string
+	err  error
+}
+
+func (e *redactedError) Error() string { return e.text }
+
+// GoString keeps %#v to the redacted Error text instead of the fields.
+func (e *redactedError) GoString() string { return e.text }
+
+// Is reports whether the original error matches target.
+func (e *redactedError) Is(target error) bool { return errors.Is(e.err, target) }
+
+// redact returns err with key removed from its text; a nil err or an empty
+// key returns err unchanged.
+func redact(err error, key string) error {
+	if err == nil || key == "" {
+		return err
+	}
+	return &redactedError{text: llm.Redact(err.Error(), key), err: err}
+}

internal/ai/llm/presets/presets_test.go

@@ -0,0 +1,662 @@
+package presets
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/ai/llm"
+)
+
+const testKey = "sk-test-0123456789"
+
+// captured is the HTTP request an adapter sent.
+type captured struct {
+	url    string
+	header http.Header
+	body   map[string]json.RawMessage
+}
+
+// recordingTransport records each request and answers it 400, so no
+// request leaves the process and the Provider never retries it.
+type recordingTransport struct{ reqs []captured }
+
+func (rt *recordingTransport) RoundTrip(r *http.Request) (*http.Response, error) {
+	c := captured{url: r.URL.String(), header: r.Header.Clone()}
+	if r.Body != nil {
+		raw, err := io.ReadAll(r.Body)
+		if err != nil {
+			return nil, err
+		}
+		if err := json.Unmarshal(raw, &c.body); err != nil {
+			return nil, err
+		}
+	}
+	rt.reqs = append(rt.reqs, c)
+	return &http.Response{
+		StatusCode: http.StatusBadRequest,
+		Header:     http.Header{"Content-Type": {"application/json"}},
+		Body:       io.NopCloser(strings.NewReader(`{}`)),
+		Request:    r,
+	}, nil
+}
+
+// generate builds the provider s describes and returns the request its
+// Generate sends for req. The adapters use http.DefaultTransport, which the
+// test replaces, so the real preset base URLs are never contacted.
+func generate(t *testing.T, s llm.Settings, key string, req llm.Request) captured {
+	t.Helper()
+	rt := &recordingTransport{}
+	orig := http.DefaultTransport
+	http.DefaultTransport = rt
+	t.Cleanup(func() { http.DefaultTransport = orig })
+
+	p, err := FromSettings(s, key)
+	if err != nil {
+		t.Fatalf("FromSettings: %v", err)
+	}
+	if _, err := p.Generate(context.Background(), req); err == nil {
+		t.Fatal("Generate succeeded through the recording transport")
+	}
+	if len(rt.reqs) != 1 {
+		t.Fatalf("sent %d requests, want 1", len(rt.reqs))
+	}
+	return rt.reqs[0]
+}
+
+func plainRequest() llm.Request {
+	return llm.Request{Messages: []llm.Message{{Role: llm.RoleUser, Content: "dinner?"}}}
+}
+
+func schemaRequest() llm.Request {
+	r := plainRequest()
+	r.Schema = &llm.JSONSchema{Name: "side_quests", Schema: json.RawMessage(`{"type":"object"}`)}
+	return r
+}
+
+func ptr(f float64) *float64 { return &f }
+
+func responseFormatType(t *testing.T, c captured) string {
+	t.Helper()
+	raw, ok := c.body["response_format"]
+	if !ok {
+		return ""
+	}
+	var rf struct{ Type string }
+	if err := json.Unmarshal(raw, &rf); err != nil {
+		t.Fatalf("response_format: %v", err)
+	}
+	return rf.Type
+}
+
+func temperature(t *testing.T, c captured) (float64, bool) {
+	t.Helper()
+	raw, ok := c.body["temperature"]
+	if !ok {
+		return 0, false
+	}
+	var f float64
+	if err := json.Unmarshal(raw, &f); err != nil {
+		t.Fatalf("temperature: %v", err)
+	}
+	return f, true
+}
+
+func TestAnthropicPreset(t *testing.T) {
+	c := generate(t, llm.Settings{Provider: "anthropic", Model: "claude-sonnet-5", Temperature: 0.7}, testKey, plainRequest())
+	if c.url != "https://api.anthropic.com/v1/messages" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("X-Api-Key"); got != testKey {
+		t.Fatalf("x-api-key = %q", got)
+	}
+	if got := c.header.Get("Authorization"); got != "" {
+		t.Fatalf("Authorization = %q, want none", got)
+	}
+	if got, ok := temperature(t, c); !ok || got != 0.7 {
+		t.Fatalf("temperature = %v, %v; want 0.7", got, ok)
+	}
+	if string(c.body["max_tokens"]) != "4096" {
+		t.Fatalf("max_tokens = %s", c.body["max_tokens"])
+	}
+}
+
+func TestAnthropicPresetAcceptsItsOwnBaseURL(t *testing.T) {
+	c := generate(t, llm.Settings{Provider: "anthropic", BaseURL: "https://api.anthropic.com", Model: "claude-sonnet-5"}, testKey, plainRequest())
+	if c.url != "https://api.anthropic.com/v1/messages" {
+		t.Fatalf("URL = %q", c.url)
+	}
+}
+
+func TestOpenAIPreset(t *testing.T) {
+	c := generate(t, llm.Settings{Provider: "openai", Model: "gpt-4o", Temperature: 0.4}, testKey, schemaRequest())
+	if c.url != "https://api.openai.com/v1/chat/completions" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("Authorization"); got != "Bearer "+testKey {
+		t.Fatalf("Authorization = %q", got)
+	}
+	if got := responseFormatType(t, c); got != "json_schema" {
+		t.Fatalf("response_format type = %q, want json_schema", got)
+	}
+	if c.header.Get("HTTP-Referer") != "" || c.header.Get("X-Title") != "" {
+		t.Fatal("openai sends OpenRouter headers")
+	}
+}
+
+func TestOpenRouterPreset(t *testing.T) {
+	s := llm.Settings{Provider: "openrouter", Model: "openai/gpt-4o", PublicURL: "https://meals.example.com/"}
+	c := generate(t, s, testKey, schemaRequest())
+	if c.url != "https://openrouter.ai/api/v1/chat/completions" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("Authorization"); got != "Bearer "+testKey {
+		t.Fatalf("Authorization = %q", got)
+	}
+	if got := c.header.Get("HTTP-Referer"); got != "https://meals.example.com/" {
+		t.Fatalf("HTTP-Referer = %q", got)
+	}
+	if got := c.header.Get("X-Title"); got != "MealQuest" {
+		t.Fatalf("X-Title = %q", got)
+	}
+	if got := responseFormatType(t, c); got != "json_schema" {
+		t.Fatalf("default response_format type = %q, want json_schema", got)
+	}
+}
+
+func TestOpenRouterFallbackModeIsJSONObject(t *testing.T) {
+	p, _ := Lookup("openrouter")
+	s := llm.Settings{
+		Provider:         "openrouter",
+		Model:            "meta-llama/llama-3.3-70b-instruct",
+		PublicURL:        "https://meals.example.com",
+		StructuredOutput: string(p.FallbackStructuredOutput),
+	}
+	c := generate(t, s, testKey, schemaRequest())
+	if got := responseFormatType(t, c); got != "json_object" {
+		t.Fatalf("response_format type = %q, want json_object", got)
+	}
+}
+
+func TestXAIPreset(t *testing.T) {
+	c := generate(t, llm.Settings{Provider: "xai", Model: "grok-4", Temperature: 0.6}, testKey, schemaRequest())
+	if c.url != "https://api.x.ai/v1/chat/completions" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("Authorization"); got != "Bearer "+testKey {
+		t.Fatalf("Authorization = %q", got)
+	}
+	for _, h := range []string{"X-Api-Key", "HTTP-Referer", "X-Title"} {
+		if got := c.header.Get(h); got != "" {
+			t.Fatalf("%s = %q, want none", h, got)
+		}
+	}
+	if got := responseFormatType(t, c); got != "json_schema" {
+		t.Fatalf("default response_format type = %q, want json_schema", got)
+	}
+	if got, ok := temperature(t, c); !ok || got != 0.6 {
+		t.Fatalf("temperature = %v, %v; want 0.6", got, ok)
+	}
+}
+
+func TestXAIFallbackModeIsJSONObject(t *testing.T) {
+	p, _ := Lookup("xai")
+	s := llm.Settings{Provider: "xai", Model: "grok-4", StructuredOutput: string(p.FallbackStructuredOutput)}
+	c := generate(t, s, testKey, schemaRequest())
+	if got := responseFormatType(t, c); got != "json_object" {
+		t.Fatalf("response_format type = %q, want json_object", got)
+	}
+}
+
+func TestXAIPresetAcceptsItsOwnBaseURL(t *testing.T) {
+	c := generate(t, llm.Settings{Provider: "xai", BaseURL: "https://api.x.ai/v1", Model: "grok-4"}, testKey, plainRequest())
+	if c.url != "https://api.x.ai/v1/chat/completions" {
+		t.Fatalf("URL = %q", c.url)
+	}
+}
+
+func TestOllamaPreset(t *testing.T) {
+	s := llm.Settings{Provider: "ollama", BaseURL: "http://ollama.lan:11434", Model: "llama3.2", Temperature: 0.5}
+	c := generate(t, s, "", plainRequest())
+	if c.url != "http://ollama.lan:11434/api/chat" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("Authorization"); got != "" {
+		t.Fatalf("Authorization = %q, want none", got)
+	}
+	var opts struct{ Temperature *float64 }
+	if err := json.Unmarshal(c.body["options"], &opts); err != nil || opts.Temperature == nil || *opts.Temperature != 0.5 {
+		t.Fatalf("options = %s", c.body["options"])
+	}
+}
+
+func TestOpenAICompatiblePreset(t *testing.T) {
+	base := llm.Settings{Provider: "openai_compatible", BaseURL: "http://llm.lan:8000/v1", Model: "qwen2.5"}
+
+	c := generate(t, base, "", schemaRequest())
+	if c.url != "http://llm.lan:8000/v1/chat/completions" {
+		t.Fatalf("URL = %q", c.url)
+	}
+	if got := c.header.Get("Authorization"); got != "" {
+		t.Fatalf("Authorization without key = %q, want none", got)
+	}
+	if got := responseFormatType(t, c); got != "json_schema" {
+		t.Fatalf("default response_format type = %q, want json_schema", got)
+	}
+
+	c = generate(t, base, testKey, plainRequest())
+	if got := c.header.Get("Authorization"); got != "Bearer "+testKey {
+		t.Fatalf("Authorization with key = %q", got)
+	}
+
+	for mode, want := range map[string]string{"json_schema": "json_schema", "json_object": "json_object", "prompt_only": ""} {
+		s := base
+		s.StructuredOutput = mode
+		if got := responseFormatType(t, generate(t, s, "", schemaRequest())); got != want {
+			t.Errorf("mode %s: response_format type = %q, want %q", mode, got, want)
+		}
+	}
+}
+
+func TestTemperatureOmittedForRejectingModels(t *testing.T) {
+	cases := map[string][]string{
+		"openai":            {"o1", "o1-mini", "o1-2024-12-17", "o3", "o3-mini"},
+		"openai_compatible": {"o1", "o1-mini", "o3-mini", "openai/o1"},
+		"openrouter":        {"openai/o1", "openai/o1-mini", "openai/o3", "openai/o3-mini", "openai/o1:online"},
+	}
+	for provider, models := range cases {
+		for _, model := range models {
+			s := llm.Settings{Provider: provider, Model: model, Temperature: 0.8}
+			switch provider {
+			case "openai_compatible":
+				s.BaseURL = "http://llm.lan/v1"
+			case "openrouter":
+				s.PublicURL = "https://mealquest.example"
+			}
+			for _, req := range []llm.Request{plainRequest(), func() llm.Request { r := plainRequest(); r.Temperature = ptr(0.2); return r }()} {
+				if got, ok := temperature(t, generate(t, s, testKey, req)); ok {
+					t.Errorf("%s %s: temperature %v sent, want omitted", provider, model, got)
+				}
+			}
+		}
+	}
+}
+
+func TestTemperatureSentForOtherModels(t *testing.T) {
+	cases := map[string][]string{
+		"openai":     {"gpt-4o", "gpt-4o-mini", "chatgpt-o1-like", "o123", "o3custom", "o1mini", "openai/o1"},
+		"openrouter": {"openai/gpt-4o", "openai/o123", "openai/o3custom", "acme/o1", "o1-mini"},
+	}
+	for provider, models := range cases {
+		for _, model := range models {
+			s := llm.Settings{Provider: provider, Model: model, Temperature: 0.8}
+			if provider == "openrouter" {
+				s.PublicURL = "https://mealquest.example"
+			}
+			if got, ok := temperature(t, generate(t, s, testKey, plainRequest())); !ok || got != 0.8 {
+				t.Errorf("%s %s: temperature = %v, %v; want 0.8", provider, model, got, ok)
+			}
+		}
+	}
+	// A request's own temperature wins over the household's.
+	req := plainRequest()
+	req.Temperature = ptr(0.1)
+	c := generate(t, llm.Settings{Provider: "openai", Model: "gpt-4o", Temperature: 0.8}, testKey, req)
+	if got, ok := temperature(t, c); !ok || got != 0.1 {
+		t.Fatalf("temperature = %v, %v; want 0.1", got, ok)
+	}
+}
+
+// A request is validated before the temperature quirk clears its
+// temperature, so a negative one is an error and nothing is sent.
+func TestNegativeTemperatureRejectedForRejectingModels(t *testing.T) {
+	rt := &recordingTransport{}
+	orig := http.DefaultTransport
+	http.DefaultTransport = rt
+	t.Cleanup(func() { http.DefaultTransport = orig })
+
+	for _, s := range []llm.Settings{
+		{Provider: "openai", Model: "o1"},
+		{Provider: "openrouter", Model: "openai/o1", PublicURL: "https://mealquest.example"},
+	} {
+		p, err := FromSettings(s, testKey)
+		if err != nil {
+			t.Fatalf("%s: FromSettings: %v", s.Model, err)
+		}
+		req := plainRequest()
+		req.Temperature = ptr(-0.5)
+		if _, err := p.Generate(context.Background(), req); err == nil || errors.Is(err, llm.ErrProvider) || !strings.Contains(err.Error(), "temperature") {
+			t.Errorf("%s: Generate = %v, want a temperature validation error", s.Model, err)
+		}
+	}
+	if len(rt.reqs) != 0 {
+		t.Fatalf("sent %d requests, want 0", len(rt.reqs))
+	}
+}
+
+func TestTemperatureQuirkPresets(t *testing.T) {
+	want := map[string]bool{"openai": true, "openrouter": true, "openai_compatible": true}
+	for name, p := range all {
+		if got := len(p.OmitTemperature) > 0; got != want[name] {
+			t.Errorf("%s: lists temperature quirk = %v, want %v", name, got, want[name])
+		}
+	}
+}
+
+func TestPresetTable(t *testing.T) {
+	cases := []struct {
+		name    string
+		adapter Adapter
+		baseURL string
+		key     KeyPolicy
+	}{
+		{"anthropic", AdapterAnthropic, "https://api.anthropic.com", KeyRequired},
+		{"openai", AdapterOpenAI, "https://api.openai.com/v1", KeyRequired},
+		{"openrouter", AdapterOpenAI, "https://openrouter.ai/api/v1", KeyRequired},
+		{"xai", AdapterOpenAI, "https://api.x.ai/v1", KeyRequired},
+		{"ollama", AdapterOllama, "", KeyNone},
+		{"openai_compatible", AdapterOpenAI, "", KeyOptional},
+	}
+	if len(all) != len(cases) {
+		t.Fatalf("%d presets, want %d", len(all), len(cases))
+	}
+	for _, c := range cases {
+		p, ok := Lookup(c.name)
+		if !ok {
+			t.Fatalf("no preset %q", c.name)
+		}
+		if p.Name != c.name || p.Adapter != c.adapter || p.BaseURL != c.baseURL || p.Key != c.key {
+			t.Errorf("%s = {%s %s %q %d}", c.name, p.Name, p.Adapter, p.BaseURL, p.Key)
+		}
+	}
+}
+
+func TestConfigErrors(t *testing.T) {
+	sentinels := []error{
+		llm.ErrUnknownProvider, llm.ErrMissingKey, llm.ErrUnexpectedKey, llm.ErrInvalidKey, llm.ErrMissingBaseURL,
+		llm.ErrMissingModel, llm.ErrMissingPublicURL, llm.ErrInvalidSetting,
+	}
+	cases := []struct {
+		name string
+		s    llm.Settings
+		key  string
+		want error
+	}{
+		{"unknown provider", llm.Settings{Provider: "gemini", Model: "m"}, testKey, llm.ErrUnknownProvider},
+		{"anthropic no key", llm.Settings{Provider: "anthropic", Model: "m"}, "", llm.ErrMissingKey},
+		{"openai no key", llm.Settings{Provider: "openai", Model: "m"}, "", llm.ErrMissingKey},
+		{"openrouter no key", llm.Settings{Provider: "openrouter", Model: "m", PublicURL: "https://x.example"}, "", llm.ErrMissingKey},
+		{"xai no key", llm.Settings{Provider: "xai", Model: "grok-4"}, "", llm.ErrMissingKey},
+		{"ollama with key", llm.Settings{Provider: "ollama", BaseURL: "http://o:11434", Model: "m"}, testKey, llm.ErrUnexpectedKey},
+		{"anthropic key with newline", llm.Settings{Provider: "anthropic", Model: "m"}, testKey + "\n", llm.ErrInvalidKey},
+		{"openai key with newline", llm.Settings{Provider: "openai", Model: "m"}, testKey + "\n", llm.ErrInvalidKey},
+		{"openrouter key with CR LF", llm.Settings{Provider: "openrouter", Model: "m", PublicURL: "https://x.example"}, testKey + "\r\nX-Injected: 1", llm.ErrInvalidKey},
+		{"xai key with newline", llm.Settings{Provider: "xai", Model: "grok-4"}, testKey + "\n", llm.ErrInvalidKey},
+		{"openai_compatible key with NUL", llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1", Model: "m"}, "\x00" + testKey, llm.ErrInvalidKey},
+		{"ollama no base URL", llm.Settings{Provider: "ollama", Model: "m"}, "", llm.ErrMissingBaseURL},
+		{"openai_compatible no base URL", llm.Settings{Provider: "openai_compatible", Model: "m"}, "", llm.ErrMissingBaseURL},
+		{"anthropic no model", llm.Settings{Provider: "anthropic"}, testKey, llm.ErrMissingModel},
+		{"openai no model", llm.Settings{Provider: "openai"}, testKey, llm.ErrMissingModel},
+		{"openrouter no model", llm.Settings{Provider: "openrouter", PublicURL: "https://x.example"}, testKey, llm.ErrMissingModel},
+		{"ollama no model", llm.Settings{Provider: "ollama", BaseURL: "http://o:11434"}, "", llm.ErrMissingModel},
+		{"openai_compatible no model", llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1"}, "", llm.ErrMissingModel},
+		{"xai no model", llm.Settings{Provider: "xai"}, testKey, llm.ErrMissingModel},
+		{"openrouter no public URL", llm.Settings{Provider: "openrouter", Model: "m"}, testKey, llm.ErrMissingPublicURL},
+		{"fixed base URL overridden", llm.Settings{Provider: "openai", BaseURL: "https://evil.example/v1", Model: "m"}, testKey, llm.ErrInvalidSetting},
+		{"xai base URL overridden", llm.Settings{Provider: "xai", BaseURL: "https://api.openai.com/v1", Model: "grok-4"}, testKey, llm.ErrInvalidSetting},
+		{"xai prompt_only", llm.Settings{Provider: "xai", Model: "grok-4", StructuredOutput: "prompt_only"}, testKey, llm.ErrInvalidSetting},
+		{"openai json_object", llm.Settings{Provider: "openai", Model: "m", StructuredOutput: "json_object"}, testKey, llm.ErrInvalidSetting},
+		{"anthropic mode", llm.Settings{Provider: "anthropic", Model: "m", StructuredOutput: "json_schema"}, testKey, llm.ErrInvalidSetting},
+		{"unknown mode", llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1", Model: "m", StructuredOutput: "xml"}, "", llm.ErrInvalidSetting},
+		{"negative temperature", llm.Settings{Provider: "openai", Model: "m", Temperature: -0.1}, testKey, llm.ErrInvalidSetting},
+		{"bad base URL", llm.Settings{Provider: "ollama", BaseURL: "ftp://o", Model: "m"}, "", llm.ErrInvalidSetting},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			p, err := FromSettings(c.s, c.key)
+			if p != nil || !errors.Is(err, c.want) {
+				t.Fatalf("FromSettings = %v, %v; want %v", p, err, c.want)
+			}
+			for _, other := range sentinels {
+				if other != c.want && errors.Is(err, other) {
+					t.Fatalf("error %v also matches %v", err, other)
+				}
+			}
+			if c.key != "" && strings.Contains(err.Error(), c.key) {
+				t.Fatalf("error leaks the key: %v", err)
+			}
+		})
+	}
+}
+
+func TestReadyProviderForEveryPreset(t *testing.T) {
+	for _, s := range []struct {
+		s   llm.Settings
+		key string
+	}{
+		{llm.Settings{Provider: "anthropic", Model: "m"}, testKey},
+		{llm.Settings{Provider: "openai", Model: "m"}, testKey},
+		{llm.Settings{Provider: "openrouter", Model: "m", PublicURL: "https://x.example"}, testKey},
+		{llm.Settings{Provider: "xai", Model: "m"}, testKey},
+		{llm.Settings{Provider: "ollama", BaseURL: "http://o:11434", Model: "m"}, ""},
+		{llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1", Model: "m"}, ""},
+	} {
+		if p, err := FromSettings(s.s, s.key); err != nil || p == nil {
+			t.Errorf("%s: FromSettings = %v, %v", s.s.Provider, p, err)
+		}
+	}
+}
+
+// A key that matches a value the request carries, or text the error spells
+// anyway, never appears in a validation error, and nothing is sent.
+func TestGenerateValidationErrorsNeverLeakKey(t *testing.T) {
+	rt := &recordingTransport{}
+	orig := http.DefaultTransport
+	http.DefaultTransport = rt
+	t.Cleanup(func() { http.DefaultTransport = orig })
+
+	for _, key := range []string{"-0.5", "temperature", "llm", "negative"} {
+		p, err := FromSettings(llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1", Model: "m"}, key)
+		if err != nil {
+			t.Fatalf("%s: FromSettings: %v", key, err)
+		}
+		req := plainRequest()
+		req.Temperature = ptr(-0.5)
+		_, err = p.Generate(context.Background(), req)
+		if err == nil || errors.Is(err, llm.ErrProvider) {
+			t.Fatalf("%s: Generate = %v, want a validation error", key, err)
+		}
+		for e := error(err); e != nil; e = errors.Unwrap(e) {
+			if s := e.Error() + fmt.Sprintf("%#v", e); strings.Contains(s, key) {
+				t.Fatalf("%s: error leaks the key: %s", key, s)
+			}
+		}
+	}
+	if len(rt.reqs) != 0 {
+		t.Fatalf("sent %d requests, want 0", len(rt.reqs))
+	}
+}
+
+// A configuration error keeps its sentinel but never holds the key, even
+// when the key is also a setting's value or text the error spells anyway.
+func TestConfigErrorsNeverLeakKey(t *testing.T) {
+	cases := []struct {
+		name string
+		s    llm.Settings
+		key  string
+		want error
+	}{
+		{"unknown provider named by key", llm.Settings{Provider: "llm", Model: "m"}, "llm", llm.ErrUnknownProvider},
+		{"no base URL", llm.Settings{Provider: "openai_compatible", Model: "m"}, "base URL", llm.ErrMissingBaseURL},
+		{"no model", llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1"}, "model", llm.ErrMissingModel},
+		{"key as model, no public URL", llm.Settings{Provider: "openrouter", Model: "missing"}, "missing", llm.ErrMissingPublicURL},
+		{"key as base URL", llm.Settings{Provider: "openai", BaseURL: "llm", Model: "m"}, "llm", llm.ErrInvalidSetting},
+		{"key as mode", llm.Settings{Provider: "openai_compatible", BaseURL: "http://l/v1", Model: "m", StructuredOutput: "xml"}, "xml", llm.ErrInvalidSetting},
+		{"key as temperature", llm.Settings{Provider: "openai", Model: "m", Temperature: -0.1}, "-0.1", llm.ErrInvalidSetting},
+		{"key in bad base URL", llm.Settings{Provider: "openai_compatible", BaseURL: "ftp://k3y", Model: "m"}, "k3y", llm.ErrInvalidSetting},
+		{"ollama with key", llm.Settings{Provider: "ollama", BaseURL: "http://o:11434", Model: "m"}, "key", llm.ErrUnexpectedKey},
+		{"key with newline", llm.Settings{Provider: "openai", Model: "m"}, "sk-test\n", llm.ErrInvalidKey},
+		{"xai key as preset name", llm.Settings{Provider: "xai"}, "xai", llm.ErrMissingModel},
+		{"xai key as missing-model text", llm.Settings{Provider: "xai"}, "model is required", llm.ErrMissingModel},
+		{"xai key as fixed-URL text", llm.Settings{Provider: "xai", BaseURL: "https://x.example/v1", Model: "m"}, "fixed", llm.ErrInvalidSetting},
+		{"xai key as structured-output text", llm.Settings{Provider: "xai", Model: "m", StructuredOutput: "prompt_only"}, "structured output", llm.ErrInvalidSetting},
+		{"key with newline as text", llm.Settings{Provider: "openai", Model: "m"}, "header\n", llm.ErrInvalidKey},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			p, err := FromSettings(c.s, c.key)
+			if p != nil || !errors.Is(err, c.want) {
+				t.Fatalf("FromSettings = %v, %v; want %v", p, err, c.want)
+			}
+			for e := error(err); e != nil; e = errors.Unwrap(e) {
+				if s := e.Error() + fmt.Sprintf("%#v", e); strings.Contains(s, c.key) {
+					t.Fatalf("error leaks the key: %s", s)
+				}
+			}
+		})
+	}
+}
+
+// scriptedTransport answers each request with the next scripted status and
+// body, echoing the key in every failure body, and counts the requests. A
+// scripted status of 0 is a transport timeout instead of a response.
+type scriptedTransport struct {
+	statuses []int
+	key      string
+	sent     int
+}
+
+func (st *scriptedTransport) RoundTrip(r *http.Request) (*http.Response, error) {
+	if st.sent == len(st.statuses) {
+		return nil, fmt.Errorf("unscripted request %d", st.sent+1)
+	}
+	status := st.statuses[st.sent]
+	st.sent++
+	if status == 0 {
+		return nil, transportTimeout{}
+	}
+	header := http.Header{"Content-Type": {"application/json"}}
+	body := `{"error":{"message":"bad key ` + st.key + `"}}`
+	switch status {
+	case http.StatusOK:
+		body = `{"model":"m","choices":[{"message":{"content":"tacos"},"finish_reason":"stop"}]}`
+	case http.StatusTooManyRequests:
+		header.Set("Retry-After", "1")
+	}
+	return &http.Response{
+		StatusCode: status,
+		Header:     header,
+		Body:       io.NopCloser(strings.NewReader(body)),
+		Request:    r,
+	}, nil
+}
+
+// transportTimeout is a net.Error that timed out.
+type transportTimeout struct{}
+
+func (transportTimeout) Error() string   { return "i/o timeout" }
+func (transportTimeout) Timeout() bool   { return true }
+func (transportTimeout) Temporary() bool { return true }
+
+// useTransport makes the adapters send through rt for the rest of the test.
+func useTransport(t *testing.T, rt http.RoundTripper) {
+	t.Helper()
+	orig := http.DefaultTransport
+	http.DefaultTransport = rt
+	t.Cleanup(func() { http.DefaultTransport = orig })
+}
+
+// The Provider FromSettings returns retries a rate-limited Generate.
+func TestFromSettingsRetriesRateLimited(t *testing.T) {
+	st := &scriptedTransport{statuses: []int{http.StatusTooManyRequests, http.StatusOK}, key: testKey}
+	useTransport(t, st)
+
+	p, err := FromSettings(llm.Settings{Provider: "openai", Model: "m"}, testKey)
+	if err != nil {
+		t.Fatalf("FromSettings: %v", err)
+	}
+	resp, err := p.Generate(context.Background(), plainRequest())
+	if err != nil {
+		t.Fatalf("Generate: %v", err)
+	}
+	if resp.Text != "tacos" {
+		t.Errorf("Text = %q, want %q", resp.Text, "tacos")
+	}
+	if st.sent != 2 {
+		t.Errorf("sent %d requests, want 2", st.sent)
+	}
+}
+
+// When every retry fails, the error FromSettings's Provider returns keeps
+// its sentinel and never holds the key the vendor echoed.
+func TestFromSettingsRetryErrorNeverLeaksKey(t *testing.T) {
+	st := &scriptedTransport{statuses: []int{http.StatusTooManyRequests, http.StatusTooManyRequests, http.StatusServiceUnavailable}, key: testKey}
+	useTransport(t, st)
+
+	p, err := FromSettings(llm.Settings{Provider: "openai", Model: "m"}, testKey)
+	if err != nil {
+		t.Fatalf("FromSettings: %v", err)
+	}
+	_, err = p.Generate(context.Background(), plainRequest())
+	if !errors.Is(err, llm.ErrProvider) {
+		t.Fatalf("Generate = %v, want %v", err, llm.ErrProvider)
+	}
+	if st.sent != llm.MaxRetries+1 {
+		t.Errorf("sent %d requests, want %d", st.sent, llm.MaxRetries+1)
+	}
+	for e := error(err); e != nil; e = errors.Unwrap(e) {
+		if s := e.Error() + fmt.Sprintf("%#v", e); strings.Contains(s, testKey) {
+			t.Fatalf("error leaks the key: %s", s)
+		}
+	}
+}
+
+// An HTTP 408 from the vendor is a 4xx answer and is not retried, though it
+// matches llm.ErrTimeout.
+func TestFromSettingsDoesNotRetryHTTP408(t *testing.T) {
+	for _, provider := range []string{"openai", "anthropic"} {
+		t.Run(provider, func(t *testing.T) {
+			st := &scriptedTransport{statuses: []int{http.StatusRequestTimeout}, key: testKey}
+			useTransport(t, st)
+
+			p, err := FromSettings(llm.Settings{Provider: provider, Model: "m"}, testKey)
+			if err != nil {
+				t.Fatalf("FromSettings: %v", err)
+			}
+			_, err = p.Generate(context.Background(), plainRequest())
+			var ts *llm.TimeoutStatusError
+			if !errors.Is(err, llm.ErrTimeout) || !errors.As(err, &ts) || ts.Status() != http.StatusRequestTimeout {
+				t.Fatalf("Generate = %v, want an HTTP 408 ErrTimeout", err)
+			}
+			if st.sent != 1 {
+				t.Errorf("sent %d requests, want 1", st.sent)
+			}
+		})
+	}
+}
+
+// A transport timeout carries no status and is retried.
+func TestFromSettingsRetriesTransportTimeout(t *testing.T) {
+	st := &scriptedTransport{statuses: []int{0, http.StatusOK}, key: testKey}
+	useTransport(t, st)
+
+	p, err := FromSettings(llm.Settings{Provider: "openai", Model: "m"}, testKey)
+	if err != nil {
+		t.Fatalf("FromSettings: %v", err)
+	}
+	resp, err := p.Generate(context.Background(), plainRequest())
+	if err != nil {
+		t.Fatalf("Generate: %v", err)
+	}
+	if resp.Text != "tacos" {
+		t.Errorf("Text = %q, want %q", resp.Text, "tacos")
+	}
+	if st.sent != 2 {
+		t.Errorf("sent %d requests, want 2", st.sent)
+	}
+}

internal/ai/llm/retry.go

@@ -0,0 +1,124 @@
+package llm
+
+import (
+	"context"
+	"errors"
+	"math/rand/v2"
+	"time"
+)
+
+const (
+	// DefaultTimeout bounds a whole Generate call, retries and waits
+	// included, whose Request sets no Timeout.
+	DefaultTimeout = 60 * time.Second
+	// MaxRetries is how many times a failed Generate is retried, so a call
+	// makes at most MaxRetries+1 attempts.
+	MaxRetries = 2
+	// MaxRetryAfter caps the wait a rate-limited vendor may ask for.
+	MaxRetryAfter = 20 * time.Second
+	// backoffBase is the first retry's backoff before jitter; each later
+	// retry doubles it.
+	backoffBase = time.Second
+)
+
+// Retrying is a Provider that retries transient Generate failures of the
+// Provider it wraps. It retries ErrRateLimited, a transport ErrTimeout and
+// a 5xx ErrProvider at most MaxRetries times, and nothing else: an error
+// carrying a 4xx HTTP status other than a rate limit, such as an HTTP 408
+// TimeoutStatusError, is not retried. A rate-limited retry waits for the
+// vendor's RetryAfter, capped at MaxRetryAfter; every other retry, and a
+// rate limit that names no wait, waits a jittered exponential backoff. The Request's Timeout, or DefaultTimeout, is one
+// deadline for the whole call, retries and waits included; a caller's
+// earlier context deadline wins. A retry whose wait would not end before
+// that deadline is not made: the last error is returned at once.
+// ListModels and Verify pass straight through.
+type Retrying struct {
+	Provider
+	// now is the clock; tests replace it.
+	now func() time.Time
+	// sleep waits d or until ctx is done; tests replace it.
+	sleep func(ctx context.Context, d time.Duration) error
+	// jitter returns a random duration in [0, n) for n > 0; tests replace
+	// it.
+	jitter func(n time.Duration) time.Duration
+}
+
+// NewRetrying returns inner wrapped with retries and the default Generate
+// timeout.
+func NewRetrying(inner Provider) *Retrying {
+	return &Retrying{
+		Provider: inner,
+		now:      time.Now,
+		sleep:    sleep,
+		jitter:   rand.N[time.Duration],
+	}
+}
+
+// Generate sends req to the wrapped Provider, retrying transient failures.
+// req.Timeout, or DefaultTimeout when it is 0, sets one deadline for the
+// whole call, carried by the context each attempt receives; attempts get
+// req with Timeout 0 so none restarts the clock.
+func (r *Retrying) Generate(ctx context.Context, req Request) (Response, error) {
+	timeout := req.Timeout
+	if timeout == 0 {
+		timeout = DefaultTimeout
+	}
+	if timeout > 0 {
+		// A negative Timeout stays on req for the wrapped Provider's
+		// Validate to reject, with its key redaction.
+		req.Timeout = 0
+	}
+	ctx, cancel := context.WithDeadline(ctx, r.now().Add(timeout))
+	defer cancel()
+	deadline, _ := ctx.Deadline()
+	for retry := 0; ; retry++ {
+		resp, err := r.Provider.Generate(ctx, req)
+		if err == nil || retry == MaxRetries || ctx.Err() != nil {
+			return resp, err
+		}
+		wait, ok := r.wait(err, retry)
+		if !ok {
+			return resp, err
+		}
+		if !r.now().Add(wait).Before(deadline) {
+			return resp, err
+		}
+		if serr := r.sleep(ctx, wait); serr != nil {
+			return resp, err
+		}
+	}
+}
+
+// wait returns how long to wait before retrying after err, the retry-th
+// retry counting from 0, and false when err is not retried.
+func (r *Retrying) wait(err error, retry int) (time.Duration, bool) {
+	var st interface{ Status() int }
+	if errors.As(err, &st) && st.Status() >= 400 && st.Status() <= 499 {
+		return 0, false
+	}
+	var rl *RateLimitedError
+	if errors.As(err, &rl) && rl.RetryAfter > 0 {
+		return min(rl.RetryAfter, MaxRetryAfter), true
+	}
+	var pe *ProviderError
+	switch {
+	case errors.Is(err, ErrRateLimited), errors.Is(err, ErrTimeout):
+	case errors.As(err, &pe) && pe.Status() >= 500 && pe.Status() <= 599:
+	default:
+		return 0, false
+	}
+	half := (backoffBase << retry) / 2
+	return half + r.jitter(half), true
+}
+
+// sleep waits d or until ctx is done, returning ctx's error in that case.
+func sleep(ctx context.Context, d time.Duration) error {
+	t := time.NewTimer(d)
+	defer t.Stop()
+	select {
+	case <-t.C:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}

internal/ai/llm/retry_test.go

@@ -0,0 +1,359 @@
+package llm
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"slices"
+	"testing"
+	"time"
+)
+
+// fakeClock is a clock whose sleeps return at once, advance it and are
+// recorded.
+type fakeClock struct {
+	t      time.Time
+	sleeps []time.Duration
+}
+
+func (c *fakeClock) now() time.Time { return c.t }
+
+func (c *fakeClock) sleep(ctx context.Context, d time.Duration) error {
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	c.sleeps = append(c.sleeps, d)
+	c.t = c.t.Add(d)
+	return nil
+}
+
+// newTestRetrying returns a Retrying over a fresh Fake with a fake clock
+// at the real current time, so real context deadlines compare sensibly,
+// and jitter that always returns its maximum.
+func newTestRetrying() (*Retrying, *Fake, *fakeClock) {
+	f := &Fake{}
+	c := &fakeClock{t: time.Now()}
+	r := NewRetrying(f)
+	r.now = c.now
+	r.sleep = c.sleep
+	r.jitter = func(n time.Duration) time.Duration { return n - 1 }
+	return r, f, c
+}
+
+var retryReq = Request{Messages: []Message{{Role: RoleUser, Content: "plan dinners"}}}
+
+func ok(text string) GenerateResult { return GenerateResult{Response: Response{Text: text}} }
+
+func fail(err error) GenerateResult { return GenerateResult{Err: err} }
+
+func assertConsumed(t *testing.T, f *Fake, attempts int) {
+	t.Helper()
+	if g, _, _ := f.Remaining(); g != 0 {
+		t.Errorf("%d scripted Generate results unused", g)
+	}
+	if n := len(f.Requests()); n != attempts {
+		t.Errorf("made %d attempts, want %d", n, attempts)
+	}
+}
+
+func TestRetryingRateLimitedThenSuccess(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(fail(NewRateLimitedError(3*time.Second, "")), ok("dinner"))
+
+	resp, err := r.Generate(context.Background(), retryReq)
+	if err != nil || resp.Text != "dinner" {
+		t.Fatalf("Generate = %+v, %v", resp, err)
+	}
+	if want := []time.Duration{3 * time.Second}; !slices.Equal(c.sleeps, want) {
+		t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+	}
+	assertConsumed(t, f, 2)
+}
+
+func TestRetryingRateLimitedWaitIsCapped(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(fail(NewRateLimitedError(time.Hour, "")), ok("dinner"))
+
+	if _, err := r.Generate(context.Background(), retryReq); err != nil {
+		t.Fatal(err)
+	}
+	if want := []time.Duration{20 * time.Second}; !slices.Equal(c.sleeps, want) {
+		t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+	}
+	assertConsumed(t, f, 2)
+}
+
+func TestRetryingRateLimitedWithoutRetryAfterBacksOff(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(fail(NewRateLimitedError(0, "")), ok("dinner"))
+
+	if _, err := r.Generate(context.Background(), retryReq); err != nil {
+		t.Fatal(err)
+	}
+	if want := []time.Duration{time.Second - 1}; !slices.Equal(c.sleeps, want) {
+		t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+	}
+}
+
+func TestRetrying5xxTwiceThenSuccess(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(
+		fail(NewProviderError(503, []byte("busy"), "")),
+		// Adapters wrap the error they return.
+		fail(fmt.Errorf("openai: generate: %w", NewProviderError(503, []byte("busy"), ""))),
+		ok("dinner"),
+	)
+
+	resp, err := r.Generate(context.Background(), retryReq)
+	if err != nil || resp.Text != "dinner" {
+		t.Fatalf("Generate = %+v, %v", resp, err)
+	}
+	// Max jitter: [0.5 s, 1 s) then [1 s, 2 s).
+	if want := []time.Duration{time.Second - 1, 2*time.Second - 1}; !slices.Equal(c.sleeps, want) {
+		t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+	}
+	assertConsumed(t, f, 3)
+}
+
+func TestRetryingBackoffJitterLowerBound(t *testing.T) {
+	r, f, c := newTestRetrying()
+	r.jitter = func(time.Duration) time.Duration { return 0 }
+	f.QueueGenerate(fail(ErrTimeout), fail(ErrTimeout), ok("dinner"))
+
+	if _, err := r.Generate(context.Background(), retryReq); err != nil {
+		t.Fatal(err)
+	}
+	if want := []time.Duration{500 * time.Millisecond, time.Second}; !slices.Equal(c.sleeps, want) {
+		t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+	}
+}
+
+func TestRetrying5xxThreeTimesFails(t *testing.T) {
+	r, f, c := newTestRetrying()
+	last := NewProviderError(503, []byte("third"), "")
+	f.QueueGenerate(
+		fail(NewProviderError(503, []byte("first"), "")),
+		fail(NewProviderError(503, []byte("second"), "")),
+		fail(last),
+	)
+
+	_, err := r.Generate(context.Background(), retryReq)
+	if err != last {
+		t.Fatalf("err = %v, want the last attempt's error", err)
+	}
+	if len(c.sleeps) != MaxRetries {
+		t.Errorf("slept %d times, want %d", len(c.sleeps), MaxRetries)
+	}
+	assertConsumed(t, f, 3)
+}
+
+func TestRetryingDoesNotRetryPermanentErrors(t *testing.T) {
+	for name, err := range map[string]error{
+		"401 auth":    ErrAuth,
+		"400":         NewProviderError(400, []byte("bad request"), ""),
+		"404":         NewProviderError(404, []byte("no such model"), ""),
+		"408":         NewTimeoutStatusError(408, ""),
+		"wrapped 408": fmt.Errorf("openai: generate: %w", NewTimeoutStatusError(408, "")),
+		"bad output":  ErrBadOutput,
+		"other":       errors.New("llm: request has no messages"),
+	} {
+		t.Run(name, func(t *testing.T) {
+			r, f, c := newTestRetrying()
+			f.QueueGenerate(fail(err))
+
+			if _, got := r.Generate(context.Background(), retryReq); got != err {
+				t.Fatalf("err = %v, want %v", got, err)
+			}
+			if len(c.sleeps) != 0 {
+				t.Errorf("slept %v", c.sleeps)
+			}
+			assertConsumed(t, f, 1)
+		})
+	}
+}
+
+// A transport timeout matches ErrTimeout like an HTTP 408, but carries no
+// status, so it is retried.
+func TestRetryingTransportTimeoutRetried(t *testing.T) {
+	r, f, _ := newTestRetrying()
+	f.QueueGenerate(fail(fmt.Errorf("openai: generate: %w", ErrTimeout)), ok("dinner"))
+
+	if _, err := r.Generate(context.Background(), retryReq); err != nil {
+		t.Fatal(err)
+	}
+	assertConsumed(t, f, 2)
+}
+
+func TestRetryingDeadlineShorterThanRetryAfter(t *testing.T) {
+	r, f, c := newTestRetrying()
+	rl := NewRateLimitedError(10*time.Second, "")
+	f.QueueGenerate(fail(rl))
+	ctx, cancel := context.WithDeadline(context.Background(), c.t.Add(5*time.Second))
+	defer cancel()
+
+	if _, err := r.Generate(ctx, retryReq); err != rl {
+		t.Fatalf("err = %v, want the rate-limited error", err)
+	}
+	if len(c.sleeps) != 0 {
+		t.Errorf("slept %v", c.sleeps)
+	}
+	assertConsumed(t, f, 1)
+}
+
+func TestRetryingDeadlineShorterThanBackoff(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(fail(ErrTimeout))
+	// The first backoff with maximum jitter is just under 1 s.
+	ctx, cancel := context.WithDeadline(context.Background(), c.t.Add(time.Second-1))
+	defer cancel()
+
+	if _, err := r.Generate(ctx, retryReq); !errors.Is(err, ErrTimeout) {
+		t.Fatalf("err = %v, want ErrTimeout", err)
+	}
+	if len(c.sleeps) != 0 {
+		t.Errorf("slept %v", c.sleeps)
+	}
+	assertConsumed(t, f, 1)
+}
+
+func TestRetryingRetriesWithinDeadline(t *testing.T) {
+	r, f, c := newTestRetrying()
+	f.QueueGenerate(fail(NewRateLimitedError(3*time.Second, "")), ok("dinner"))
+	ctx, cancel := context.WithDeadline(context.Background(), c.t.Add(time.Minute))
+	defer cancel()
+
+	if _, err := r.Generate(ctx, retryReq); err != nil {
+		t.Fatal(err)
+	}
+	assertConsumed(t, f, 2)
+}
+
+func TestRetryingStopsWhenContextDone(t *testing.T) {
+	r, f, _ := newTestRetrying()
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	f.QueueGenerate(fail(ErrTimeout))
+
+	if _, err := r.Generate(ctx, retryReq); !errors.Is(err, ErrTimeout) {
+		t.Fatalf("err = %v, want ErrTimeout", err)
+	}
+	assertConsumed(t, f, 1)
+}
+
+// slowProvider is a Provider whose every attempt takes d on clock c,
+// records the deadline of the context it received, and times out.
+type slowProvider struct {
+	Provider
+	c         *fakeClock
+	d         time.Duration
+	reqs      []Request
+	deadlines []time.Time
+}
+
+func (p *slowProvider) Generate(ctx context.Context, req Request) (Response, error) {
+	p.reqs = append(p.reqs, req)
+	deadline, _ := ctx.Deadline()
+	p.deadlines = append(p.deadlines, deadline)
+	p.c.t = p.c.t.Add(p.d)
+	return Response{}, ErrTimeout
+}
+
+func TestRetryingTimeoutBoundsWholeCall(t *testing.T) {
+	for _, tc := range []struct {
+		name    string
+		timeout time.Duration
+		want    time.Duration
+	}{
+		{"default", 0, 60 * time.Second},
+		{"custom", 10 * time.Second, 10 * time.Second},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			r, _, c := newTestRetrying()
+			// Each attempt uses most of the one deadline, so a fresh full
+			// timeout per attempt would allow every retry; one deadline
+			// leaves room for exactly one.
+			p := &slowProvider{c: c, d: tc.want * 5 / 6}
+			r.Provider = p
+			start := c.t
+			req := retryReq
+			req.Timeout = tc.timeout
+
+			if _, err := r.Generate(context.Background(), req); !errors.Is(err, ErrTimeout) {
+				t.Fatalf("err = %v, want ErrTimeout", err)
+			}
+			if len(p.deadlines) != 2 {
+				t.Fatalf("made %d attempts, want 2", len(p.deadlines))
+			}
+			for i, d := range p.deadlines {
+				if !d.Equal(start.Add(tc.want)) {
+					t.Errorf("attempt %d deadline = start+%v, want start+%v", i, d.Sub(start), tc.want)
+				}
+				if p.reqs[i].Timeout != 0 {
+					t.Errorf("attempt %d Timeout = %v, want 0", i, p.reqs[i].Timeout)
+				}
+			}
+			if want := []time.Duration{time.Second - 1}; !slices.Equal(c.sleeps, want) {
+				t.Errorf("sleeps = %v, want %v", c.sleeps, want)
+			}
+		})
+	}
+}
+
+func TestRetryingCallerDeadlineShorterThanTimeout(t *testing.T) {
+	r, _, c := newTestRetrying()
+	p := &slowProvider{c: c, d: time.Second}
+	r.Provider = p
+	ctx, cancel := context.WithDeadline(context.Background(), c.t.Add(5*time.Second))
+	defer cancel()
+
+	if _, err := r.Generate(ctx, retryReq); !errors.Is(err, ErrTimeout) {
+		t.Fatalf("err = %v, want ErrTimeout", err)
+	}
+	for i, d := range p.deadlines {
+		if want, _ := ctx.Deadline(); !d.Equal(want) {
+			t.Errorf("attempt %d deadline = %v, want caller's %v", i, d, want)
+		}
+	}
+}
+
+func TestRetryingRejectsNegativeTimeout(t *testing.T) {
+	r, f, _ := newTestRetrying()
+	f.QueueGenerate(fail(errors.New("llm: timeout is negative")))
+	req := retryReq
+	req.Timeout = -time.Second
+
+	if _, err := r.Generate(context.Background(), req); err == nil {
+		t.Fatal("Generate accepted a negative timeout")
+	}
+	assertConsumed(t, f, 1)
+	if got := f.Requests()[0].Timeout; got != -time.Second {
+		t.Errorf("wrapped Provider got Timeout %v, want -1s to reject", got)
+	}
+}
+
+func TestRetryingPassesThroughListModelsAndVerify(t *testing.T) {
+	r, f, _ := newTestRetrying()
+	f.QueueListModels(ListModelsResult{Err: ErrTimeout})
+	f.QueueVerify(ErrTimeout)
+
+	if _, err := r.ListModels(context.Background()); !errors.Is(err, ErrTimeout) {
+		t.Fatalf("ListModels err = %v", err)
+	}
+	if err := r.Verify(context.Background()); !errors.Is(err, ErrTimeout) {
+		t.Fatalf("Verify err = %v", err)
+	}
+	if _, l, v := f.Remaining(); l != 0 || v != 0 {
+		t.Fatalf("Remaining = %d, %d", l, v)
+	}
+}
+
+func TestSleepStopsWhenContextDone(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	if err := sleep(ctx, time.Hour); !errors.Is(err, context.Canceled) {
+		t.Fatalf("sleep err = %v", err)
+	}
+	if err := sleep(context.Background(), time.Millisecond); err != nil {
+		t.Fatalf("sleep err = %v", err)
+	}
+}

internal/ai/llm/settings.go

@@ -0,0 +1,68 @@
+package llm
+
+import "errors"
+
+// Settings is the household's AI configuration, the input to
+// presets.FromSettings. The caller fills it from the db.AiSetting row and
+// the service config; this package does not import internal/db.
+//
+//	llm.Settings{
+//		Provider:    row.Provider,
+//		BaseURL:     row.BaseUrl,
+//		Model:       row.Model,
+//		Temperature: row.Temperature,
+//		PublicURL:   cfg.PublicURL.String(), // MEALQUEST_PUBLIC_URL
+//	}
+//
+// Settings never holds the API key: the caller decrypts it and passes it
+// to presets.FromSettings separately.
+type Settings struct {
+	// Provider names the preset: "anthropic", "openai", "openrouter",
+	// "xai", "ollama" or "openai_compatible".
+	Provider string
+	// BaseURL is the API root. It is required for ollama and
+	// openai_compatible; the other presets fix their own, and a non-empty
+	// value must equal it.
+	BaseURL string
+	// Model is the model id Generate requests. It is required.
+	Model string
+	// Temperature is the household's sampling temperature. It is sent with
+	// every request that sets none, except to models that reject it.
+	Temperature float64
+	// PublicURL is MEALQUEST_PUBLIC_URL. OpenRouter requires it and
+	// receives it as the HTTP-Referer header; other presets ignore it.
+	PublicURL string
+	// StructuredOutput selects how an OpenAI-compatible preset asks for
+	// JSON: "json_schema", "json_object" or "prompt_only". Empty selects
+	// the preset's default, json_schema. Each preset allows only the modes
+	// it lists; anthropic and ollama allow none, so it must be empty.
+	StructuredOutput string
+}
+
+// Configuration errors from presets.FromSettings. Each is distinct and
+// matches with errors.Is.
+var (
+	// ErrUnknownProvider means Settings.Provider names no preset.
+	ErrUnknownProvider = errors.New("llm: unknown provider")
+	// ErrMissingKey means the preset requires an API key and none was
+	// given.
+	ErrMissingKey = errors.New("llm: API key is required")
+	// ErrUnexpectedKey means an API key was given to a preset that sends
+	// none.
+	ErrUnexpectedKey = errors.New("llm: provider takes no API key")
+	// ErrInvalidKey means the API key is not a valid HTTP header value:
+	// it has a control character such as CR or LF.
+	ErrInvalidKey = errors.New("llm: API key is not a valid header value")
+	// ErrMissingBaseURL means the preset requires a base URL and none was
+	// given.
+	ErrMissingBaseURL = errors.New("llm: base URL is required")
+	// ErrMissingModel means Settings.Model is empty.
+	ErrMissingModel = errors.New("llm: model is required")
+	// ErrMissingPublicURL means the preset requires Settings.PublicURL and
+	// it is empty.
+	ErrMissingPublicURL = errors.New("llm: public URL is required")
+	// ErrInvalidSetting means a setting has a value the preset does not
+	// accept, such as a base URL other than the preset's, an unsupported
+	// structured output mode or a negative temperature.
+	ErrInvalidSetting = errors.New("llm: invalid setting")
+)

internal/db/jobs.sql.go

@@ -0,0 +1,166 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.31.1
+// source: jobs.sql
+
+package db
+
+import (
+	"context"
+	"database/sql"
+)
+
+const claimNextJob = `-- name: ClaimNextJob :one
+UPDATE jobs
+SET status = 'running', started_at = ?1, updated_at = ?1
+WHERE id = (SELECT id FROM jobs WHERE status = 'queued' ORDER BY id LIMIT 1)
+RETURNING id, kind, status, payload, result, error, started_at, finished_at, created_at, updated_at
+`
+
+// Marks the oldest queued job running and returns it. Returns sql.ErrNoRows
+// when no job is queued.
+func (q *Queries) ClaimNextJob(ctx context.Context, now sql.NullString) (Job, error) {
+	row := q.db.QueryRowContext(ctx, claimNextJob, now)
+	var i Job
+	err := row.Scan(
+		&i.ID,
+		&i.Kind,
+		&i.Status,
+		&i.Payload,
+		&i.Result,
+		&i.Error,
+		&i.StartedAt,
+		&i.FinishedAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
+const createJob = `-- name: CreateJob :exec
+INSERT INTO jobs (id, kind, status, payload, created_at, updated_at)
+VALUES (?, ?, 'queued', ?, ?, ?)
+`
+
+type CreateJobParams struct {
+	ID        string
+	Kind      string
+	Payload   string
+	CreatedAt string
+	UpdatedAt string
+}
+
+func (q *Queries) CreateJob(ctx context.Context, arg CreateJobParams) error {
+	_, err := q.db.ExecContext(ctx, createJob,
+		arg.ID,
+		arg.Kind,
+		arg.Payload,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	return err
+}
+
+const failJob = `-- name: FailJob :execrows
+UPDATE jobs
+SET status = 'failed', error = ?1, finished_at = ?2, updated_at = ?2
+WHERE id = ?3 AND status = 'running'
+`
+
+type FailJobParams struct {
+	Error sql.NullString
+	Now   sql.NullString
+	ID    string
+}
+
+func (q *Queries) FailJob(ctx context.Context, arg FailJobParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, failJob, arg.Error, arg.Now, arg.ID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+const failRunningJobs = `-- name: FailRunningJobs :execrows
+UPDATE jobs
+SET status = 'failed', error = ?1, finished_at = ?2, updated_at = ?2
+WHERE status = 'running'
+`
+
+type FailRunningJobsParams struct {
+	Error sql.NullString
+	Now   sql.NullString
+}
+
+// Fails every job left running, at boot before any worker starts.
+func (q *Queries) FailRunningJobs(ctx context.Context, arg FailRunningJobsParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, failRunningJobs, arg.Error, arg.Now)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+const getJob = `-- name: GetJob :one
+SELECT id, kind, status, payload, result, error, started_at, finished_at, created_at, updated_at FROM jobs
+WHERE id = ?
+`
+
+func (q *Queries) GetJob(ctx context.Context, id string) (Job, error) {
+	row := q.db.QueryRowContext(ctx, getJob, id)
+	var i Job
+	err := row.Scan(
+		&i.ID,
+		&i.Kind,
+		&i.Status,
+		&i.Payload,
+		&i.Result,
+		&i.Error,
+		&i.StartedAt,
+		&i.FinishedAt,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}
+
+const publishJobResult = `-- name: PublishJobResult :execrows
+UPDATE jobs
+SET result = ?, updated_at = ?
+WHERE id = ? AND status = 'running'
+`
+
+type PublishJobResultParams struct {
+	Result    sql.NullString
+	UpdatedAt string
+	ID        string
+}
+
+// Stores a partial result of a running job.
+func (q *Queries) PublishJobResult(ctx context.Context, arg PublishJobResultParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, publishJobResult, arg.Result, arg.UpdatedAt, arg.ID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+const succeedJob = `-- name: SucceedJob :execrows
+UPDATE jobs
+SET status = 'succeeded', result = ?1, finished_at = ?2, updated_at = ?2
+WHERE id = ?3 AND status = 'running'
+`
+
+type SucceedJobParams struct {
+	Result sql.NullString
+	Now    sql.NullString
+	ID     string
+}
+
+func (q *Queries) SucceedJob(ctx context.Context, arg SucceedJobParams) (int64, error) {
+	result, err := q.db.ExecContext(ctx, succeedJob, arg.Result, arg.Now, arg.ID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}

internal/db/querier.go

@@ -6,17 +6,25 @@ package db
 
 import (
 	"context"
+	"database/sql"
 )
 
 type Querier interface {
 	// An unknown id returns sql.ErrNoRows.
 	ArchiveDinner(ctx context.Context, arg ArchiveDinnerParams) (Dinner, error)
+	// Marks the oldest queued job running and returns it. Returns sql.ErrNoRows
+	// when no job is queued.
+	ClaimNextJob(ctx context.Context, now sql.NullString) (Job, error)
 	CreateDinner(ctx context.Context, arg CreateDinnerParams) (Dinner, error)
+	CreateJob(ctx context.Context, arg CreateJobParams) error
 	CreatePhoto(ctx context.Context, arg CreatePhotoParams) (Photo, error)
 	CreateRecipeIngredient(ctx context.Context, arg CreateRecipeIngredientParams) error
 	CreateRecipeStep(ctx context.Context, arg CreateRecipeStepParams) error
 	DeleteRecipeIngredients(ctx context.Context, recipeID string) error
 	DeleteRecipeSteps(ctx context.Context, recipeID string) error
+	FailJob(ctx context.Context, arg FailJobParams) (int64, error)
+	// Fails every job left running, at boot before any worker starts.
+	FailRunningJobs(ctx context.Context, arg FailRunningJobsParams) (int64, error)
 	// Returns sql.ErrNoRows until the row exists.
 	GetAISettings(ctx context.Context) (AiSetting, error)
 	// Returns sql.ErrNoRows until the row exists.
@@ -26,6 +34,7 @@ type Querier interface {
 	GetHouseholdSettings(ctx context.Context) (HouseholdSetting, error)
 	// Returns sql.ErrNoRows until the row exists.
 	GetIntegrationsGoogle(ctx context.Context) (IntegrationsGoogle, error)
+	GetJob(ctx context.Context, id string) (Job, error)
 	// Finds stored image bytes by content hash. The schema does not make sha256
 	// unique, so the earliest-created (lowest id) match is returned.
 	GetPhotoBySHA256(ctx context.Context, sha256 string) (Photo, error)
@@ -36,8 +45,11 @@ type Querier interface {
 	ListDinnersByStatus(ctx context.Context, status string) ([]Dinner, error)
 	ListRecipeIngredients(ctx context.Context, recipeID string) ([]RecipeIngredient, error)
 	ListRecipeSteps(ctx context.Context, recipeID string) ([]RecipeStep, error)
+	// Stores a partial result of a running job.
+	PublishJobResult(ctx context.Context, arg PublishJobResultParams) (int64, error)
 	// An unknown id returns sql.ErrNoRows.
 	SetDinnerFavorite(ctx context.Context, arg SetDinnerFavoriteParams) (Dinner, error)
+	SucceedJob(ctx context.Context, arg SucceedJobParams) (int64, error)
 	// An unknown id returns sql.ErrNoRows.
 	UpdateDinner(ctx context.Context, arg UpdateDinnerParams) (Dinner, error)
 	// Creates the single row (id 1) or replaces every column except id and

internal/household/defaults.go

@@ -0,0 +1,93 @@
+package household
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// DefaultPersonaPrompt is the default AI system prompt (CTXD PROMPTS.MD §4).
+// SeedAISettings stores it on first boot and the Admin reset restores it.
+const DefaultPersonaPrompt = `You are MealQuest, a dinner planning assistant for one household. Suggest dinners
+similar to their regular rotation, nudging them to try something a little new each
+week. Prefer weeknight-friendly recipes with common grocery-store ingredients.
+Flag crock pot meals and anything 30 minutes or less as "quick". Keep explanations
+short, warm and specific — mention the household's own regular dinners when you
+explain why something fits. Never suggest a dinner they already make or have
+declined.`
+
+// Seed values for the AI settings (CTXD CONTEXT.MD). The base URL and model
+// are empty until the household picks a provider preset; there is no key.
+const (
+	SeedAIProvider    = "anthropic"
+	SeedAIBaseURL     = ""
+	SeedAIModel       = ""
+	SeedAITemperature = 0.7
+)
+
+// seedNotificationPrefs are the notification preferences for a new
+// household, one per event: push for every event, chat only for the plan
+// and the shopping list.
+var seedNotificationPrefs = []struct {
+	Event      string
+	Push, Chat bool
+}{
+	{Event: "plan_ready", Push: true, Chat: true},
+	{Event: "list_ready", Push: true, Chat: true},
+	{Event: "day_of_reminder", Push: true, Chat: false},
+	{Event: "new_suggestions", Push: true, Chat: false},
+	{Event: "rotation_review", Push: true, Chat: false},
+}
+
+// SeedAISettings creates the AI settings row with the seed values and
+// DefaultPersonaPrompt if it does not exist. An existing row is never
+// changed.
+func SeedAISettings(ctx context.Context, st *store.Store) error {
+	return st.WithTx(ctx, func(tx *sql.Tx) error {
+		q := db.New(tx)
+		_, err := q.GetAISettings(ctx)
+		if err == nil {
+			return nil
+		}
+		if !errors.Is(err, sql.ErrNoRows) {
+			return fmt.Errorf("household: read AI settings: %w", err)
+		}
+		now := store.Now().String()
+		_, err = q.UpsertAISettings(ctx, db.UpsertAISettingsParams{
+			Provider:     SeedAIProvider,
+			BaseUrl:      SeedAIBaseURL,
+			Model:        SeedAIModel,
+			Temperature:  SeedAITemperature,
+			SystemPrompt: sql.NullString{String: DefaultPersonaPrompt, Valid: true},
+			CreatedAt:    now,
+			UpdatedAt:    now,
+		})
+		if err != nil {
+			return fmt.Errorf("household: seed AI settings: %w", err)
+		}
+		return nil
+	})
+}
+
+// SeedNotificationPrefs creates the seed notification preference row of
+// every event that has none. Existing rows are never changed.
+func SeedNotificationPrefs(ctx context.Context, st *store.Store) error {
+	return st.WithTx(ctx, func(tx *sql.Tx) error {
+		now := store.Now().String()
+		for _, p := range seedNotificationPrefs {
+			_, err := tx.ExecContext(ctx,
+				`INSERT INTO notification_prefs (event, push, chat, created_at, updated_at)
+				VALUES (?, ?, ?, ?, ?)
+				ON CONFLICT (event) DO NOTHING`,
+				p.Event, p.Push, p.Chat, now, now)
+			if err != nil {
+				return fmt.Errorf("household: seed notification preference %s: %w", p.Event, err)
+			}
+		}
+		return nil
+	})
+}

internal/household/defaults_test.go

@@ -0,0 +1,220 @@
+package household
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// notificationPrefs returns the stored notification preferences by event as
+// [push, chat].
+func notificationPrefs(t *testing.T, st *store.Store) map[string][2]int64 {
+	t.Helper()
+	rows, err := st.Reader.QueryContext(context.Background(), `SELECT event, push, chat FROM notification_prefs`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+	got := make(map[string][2]int64)
+	for rows.Next() {
+		var event string
+		var push, chat int64
+		if err := rows.Scan(&event, &push, &chat); err != nil {
+			t.Fatal(err)
+		}
+		got[event] = [2]int64{push, chat}
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatal(err)
+	}
+	return got
+}
+
+func TestSeedAISettingsCreatesRow(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+	st := migratedStore(t, t.TempDir())
+
+	if err := SeedAISettings(ctx, st); err != nil {
+		t.Fatal(err)
+	}
+	got, err := db.New(st.Reader).GetAISettings(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := db.AiSetting{
+		ID:           1,
+		Provider:     "anthropic",
+		BaseUrl:      "",
+		Model:        "",
+		Temperature:  0.7,
+		SystemPrompt: sql.NullString{String: DefaultPersonaPrompt, Valid: true},
+		CreatedAt:    got.CreatedAt,
+		UpdatedAt:    got.UpdatedAt,
+	}
+	if got.ID != want.ID || got.Provider != want.Provider || got.BaseUrl != want.BaseUrl ||
+		got.Model != want.Model || got.Temperature != want.Temperature || got.SystemPrompt != want.SystemPrompt ||
+		got.ApiKeyCt != nil || got.ApiKeyLast4.Valid || got.KeyVerifiedAt.Valid {
+		t.Errorf("seeded AI settings = %+v\nwant %+v", got, want)
+	}
+	var created store.Timestamp
+	if err := created.Scan(got.CreatedAt); err != nil {
+		t.Errorf("created_at: %v", err)
+	}
+	if got.UpdatedAt != got.CreatedAt {
+		t.Errorf("updated_at = %q, want created_at %q", got.UpdatedAt, got.CreatedAt)
+	}
+}
+
+func TestDefaultPersonaPrompt(t *testing.T) {
+	t.Parallel()
+	const want = "You are MealQuest, a dinner planning assistant for one household. Suggest dinners\n" +
+		"similar to their regular rotation, nudging them to try something a little new each\n" +
+		"week. Prefer weeknight-friendly recipes with common grocery-store ingredients.\n" +
+		"Flag crock pot meals and anything 30 minutes or less as \"quick\". Keep explanations\n" +
+		"short, warm and specific — mention the household's own regular dinners when you\n" +
+		"explain why something fits. Never suggest a dinner they already make or have\n" +
+		"declined."
+	if DefaultPersonaPrompt != want {
+		t.Errorf("DefaultPersonaPrompt = %q\nwant %q", DefaultPersonaPrompt, want)
+	}
+}
+
+func TestSeedAISettingsNeverOverwrites(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+	dir := t.TempDir()
+
+	// First boot seeds; the household then configures a provider.
+	first := migratedStore(t, dir)
+	if err := SeedAISettings(ctx, first); err != nil {
+		t.Fatal(err)
+	}
+	seeded, err := db.New(first.Reader).GetAISettings(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	changed, err := db.New(first.Writer).UpsertAISettings(ctx, db.UpsertAISettingsParams{
+		Provider:      "ollama",
+		BaseUrl:       "http://ollama:11434",
+		Model:         "llama3",
+		Temperature:   0.2,
+		SystemPrompt:  sql.NullString{String: "Be brief.", Valid: true},
+		ApiKeyCt:      []byte{1, 2, 3},
+		ApiKeyLast4:   sql.NullString{String: "wxyz", Valid: true},
+		KeyVerifiedAt: sql.NullString{String: store.Now().String(), Valid: true},
+		CreatedAt:     seeded.CreatedAt,
+		UpdatedAt:     store.Now().String(),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := first.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	// A later boot reopens the same database and seeds again.
+	st := migratedStore(t, dir)
+	if err := SeedAISettings(ctx, st); err != nil {
+		t.Fatalf("reboot: %v", err)
+	}
+	got, err := db.New(st.Reader).GetAISettings(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.Provider != changed.Provider || got.BaseUrl != changed.BaseUrl || got.Model != changed.Model ||
+		got.Temperature != changed.Temperature || got.SystemPrompt != changed.SystemPrompt ||
+		string(got.ApiKeyCt) != string(changed.ApiKeyCt) || got.ApiKeyLast4 != changed.ApiKeyLast4 ||
+		got.KeyVerifiedAt != changed.KeyVerifiedAt || got.CreatedAt != changed.CreatedAt || got.UpdatedAt != changed.UpdatedAt {
+		t.Errorf("reboot changed AI settings:\n got %+v\nwant %+v", got, changed)
+	}
+}
+
+func TestSeedNotificationPrefsCreatesRows(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+	st := migratedStore(t, t.TempDir())
+
+	if err := SeedNotificationPrefs(ctx, st); err != nil {
+		t.Fatal(err)
+	}
+	want := map[string][2]int64{
+		"plan_ready":      {1, 1},
+		"list_ready":      {1, 1},
+		"day_of_reminder": {1, 0},
+		"new_suggestions": {1, 0},
+		"rotation_review": {1, 0},
+	}
+	got := notificationPrefs(t, st)
+	if len(got) != len(want) {
+		t.Errorf("seeded %d notification preferences, want %d: %v", len(got), len(want), got)
+	}
+	for event, w := range want {
+		if g, ok := got[event]; !ok || g != w {
+			t.Errorf("%s [push, chat] = %v (present %t), want %v", event, g, ok, w)
+		}
+	}
+
+	var created, updated string
+	err := st.Reader.QueryRowContext(ctx, `SELECT created_at, updated_at FROM notification_prefs WHERE event = 'plan_ready'`).Scan(&created, &updated)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var ts store.Timestamp
+	if err := ts.Scan(created); err != nil {
+		t.Errorf("created_at: %v", err)
+	}
+	if updated != created {
+		t.Errorf("updated_at = %q, want created_at %q", updated, created)
+	}
+}
+
+func TestSeedNotificationPrefsNeverOverwrites(t *testing.T) {
+	t.Parallel()
+	ctx := context.Background()
+	dir := t.TempDir()
+
+	// First boot seeds; the household then changes two preferences, and one
+	// event's row goes missing.
+	first := migratedStore(t, dir)
+	if err := SeedNotificationPrefs(ctx, first); err != nil {
+		t.Fatal(err)
+	}
+	for _, stmt := range []string{
+		`UPDATE notification_prefs SET push = 0, chat = 0 WHERE event = 'plan_ready'`,
+		`UPDATE notification_prefs SET chat = 1 WHERE event = 'rotation_review'`,
+		`DELETE FROM notification_prefs WHERE event = 'new_suggestions'`,
+	} {
+		if _, err := first.Writer.ExecContext(ctx, stmt); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := first.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	// A later boot keeps the changed rows and seeds only the missing one.
+	st := migratedStore(t, dir)
+	if err := SeedNotificationPrefs(ctx, st); err != nil {
+		t.Fatalf("reboot: %v", err)
+	}
+	want := map[string][2]int64{
+		"plan_ready":      {0, 0},
+		"list_ready":      {1, 1},
+		"day_of_reminder": {1, 0},
+		"new_suggestions": {1, 0},
+		"rotation_review": {1, 1},
+	}
+	got := notificationPrefs(t, st)
+	if len(got) != len(want) {
+		t.Errorf("%d notification preferences after reboot, want %d: %v", len(got), len(want), got)
+	}
+	for event, w := range want {
+		if g, ok := got[event]; !ok || g != w {
+			t.Errorf("after reboot %s [push, chat] = %v (present %t), want %v", event, g, ok, w)
+		}
+	}
+}

internal/jobs/builtin.go

@@ -0,0 +1,44 @@
+package jobs
+
+import (
+	"context"
+	"encoding/json"
+)
+
+// KindNoop is the framework's built-in job kind: it does no work and
+// succeeds with {"ok":true}. It is the runner's own trivial kind, as Feature
+// 09's trivial test skill is the harness's, and the startup and readiness
+// job: a noop job reaching succeeded proves the runner claims, runs and
+// records jobs.
+const KindNoop = "noop"
+
+// NoopPayload is the payload of a noop job.
+type NoopPayload struct{}
+
+// NoopResult is the result of a noop job.
+type NoopResult struct{}
+
+// PublicJSON returns {"ok":true}.
+func (NoopResult) PublicJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		OK bool `json:"ok"`
+	}{OK: true})
+}
+
+func runNoop(context.Context, NoopPayload, func(NoopResult) error) (NoopResult, error) {
+	return NoopResult{}, nil
+}
+
+// Builtins enqueues the framework's built-in job kinds.
+type Builtins struct {
+	Noop *Kind[NoopPayload]
+}
+
+// RegisterBuiltins registers the framework's built-in job kinds on r.
+func RegisterBuiltins(r *Runner) (*Builtins, error) {
+	noop, err := Register(r, KindNoop, runNoop)
+	if err != nil {
+		return nil, err
+	}
+	return &Builtins{Noop: noop}, nil
+}

internal/jobs/jobs.go

@@ -0,0 +1,461 @@
+// Package jobs runs long work in the background. A job is a row in the jobs
+// table: Enqueue inserts it queued, and a fixed pool of workers claims queued
+// jobs oldest first, so the table itself is the queue and a job enqueued
+// before a restart still runs after it.
+//
+// Each job kind has one handler, registered before Start. A handler takes a
+// typed payload and returns a result implementing Public; it may publish
+// partial results while it runs. The runner stores only what a result's
+// PublicJSON returns and, for a failed job, only a failure code: either a
+// *Failure code the kind declared at registration or one of the runner's own
+// codes. Handler error text, which may quote a URL, token or response body
+// from a dependency, is never stored, returned by the API or logged.
+package jobs
+
+import (
+	"bytes"
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"regexp"
+	"sync"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+// Status is the state of a job.
+type Status string
+
+// Job states. A job moves queued → running → succeeded or failed.
+const (
+	StatusQueued    Status = "queued"
+	StatusRunning   Status = "running"
+	StatusSucceeded Status = "succeeded"
+	StatusFailed    Status = "failed"
+)
+
+// Failure codes the runner stores itself. A kind cannot declare them.
+const (
+	// CodeInterrupted is the error of a job a previous process left running.
+	// It is fixed framework text, not a snake-case code, so no kind can
+	// declare it.
+	CodeInterrupted = "interrupted by restart"
+	// CodeInternal is the error of a job whose handler failed with anything
+	// but a *Failure with a code its kind declared, or whose payload or
+	// result could not be encoded. The underlying error is neither stored
+	// nor logged.
+	CodeInternal = "internal_error"
+	// CodeUnknownKind is the error of a job whose kind has no handler.
+	CodeUnknownKind = "unknown_kind"
+)
+
+// Claim retry backoff. A worker whose claim fails with a database error
+// retries after claimRetryMin, doubling up to claimRetryMax, so a job queued
+// when the error clears is claimed without waiting for a wake token.
+const (
+	claimRetryMin = 50 * time.Millisecond
+	claimRetryMax = 5 * time.Second
+)
+
+// codePattern is the form of every failure code: lower-case snake case.
+var codePattern = regexp.MustCompile(`^[a-z][a-z0-9_]{0,63}$`)
+
+// ErrNotFound is returned by Get for an unknown job id.
+var ErrNotFound = errors.New("jobs: job not found")
+
+// ErrUnknownKind is returned by Runner.Enqueue for a kind with no
+// registered handler.
+var ErrUnknownKind = errors.New("jobs: unknown job kind")
+
+// ErrInvalidPayload is returned by Runner.Enqueue for a payload that does
+// not decode into the kind's payload type.
+var ErrInvalidPayload = errors.New("jobs: payload does not decode")
+
+// Failure is a handler error reporting a failure code the household may
+// see. Code must be one the job's kind declared at registration; the runner
+// stores it as the job's error. Any other handler error, including a Failure
+// with an undeclared code, is stored as CodeInternal.
+type Failure struct {
+	Code string
+}
+
+func (f *Failure) Error() string { return "jobs: failure " + f.Code }
+
+// Public is a job result. PublicJSON returns the JSON the runner stores and
+// GET /api/v1/jobs/{id} returns, so a result type states exactly which of its
+// data is public; nothing else of the value is ever encoded.
+type Public interface {
+	PublicJSON() ([]byte, error)
+}
+
+// Handler runs one job with its payload. It may call publish any number of
+// times with a partial result, which Get returns while the job runs; its
+// return value is the final result. ctx is cancelled when the runner stops.
+type Handler[P any, R Public] func(ctx context.Context, payload P, publish func(partial R) error) (R, error)
+
+// Job is a job as reported by GET /api/v1/jobs/{id}. Result is the latest
+// partial or final result, and is null until the handler publishes one.
+// Error is set only on a failed job.
+type Job struct {
+	ID     string          `json:"id"`
+	Kind   string          `json:"kind"`
+	Status Status          `json:"status"`
+	Result json.RawMessage `json:"result"`
+	Error  *string         `json:"error"`
+}
+
+// runFunc is a registered Handler with its payload and results as JSON. It
+// returns the failure code to store, or "" on success; the logged reason
+// never quotes an error.
+type runFunc func(ctx context.Context, payload string, publish func(json.RawMessage) error) (result json.RawMessage, code, reason string)
+
+// handler is a registered kind: run runs a job, and check reports whether
+// a payload decodes into the kind's payload type.
+type handler struct {
+	run   runFunc
+	check func(payload []byte) bool
+}
+
+// Runner owns the job handlers and the worker pool.
+type Runner struct {
+	st      *store.Store
+	logger  *slog.Logger
+	workers int
+	// wake holds up to one token per worker; Enqueue adds one so an idle
+	// worker looks for the new job.
+	wake chan struct{}
+	// claim claims the oldest queued job, marking it running at now.
+	claim func(ctx context.Context, now sql.NullString) (db.Job, error)
+
+	mu       sync.Mutex
+	handlers map[string]handler
+	started  bool
+
+	wg sync.WaitGroup
+}
+
+// NewRunner returns a runner over st with workers concurrent workers.
+func NewRunner(st *store.Store, logger *slog.Logger, workers int) (*Runner, error) {
+	if st == nil {
+		return nil, errors.New("jobs: nil store")
+	}
+	if logger == nil {
+		return nil, errors.New("jobs: nil logger")
+	}
+	if workers < 1 {
+		return nil, fmt.Errorf("jobs: %d workers, want at least 1", workers)
+	}
+	return &Runner{
+		st:       st,
+		logger:   logger,
+		workers:  workers,
+		wake:     make(chan struct{}, workers),
+		claim:    db.New(st.Writer).ClaimNextJob,
+		handlers: make(map[string]handler),
+	}, nil
+}
+
+// Kind enqueues jobs of one registered kind.
+type Kind[P any] struct {
+	r    *Runner
+	name string
+}
+
+// Register makes h the handler for kind and returns the Kind that enqueues
+// its jobs. failureCodes are the *Failure codes h may report. It must be
+// called before Start, once per kind.
+func Register[P any, R Public](r *Runner, kind string, h Handler[P, R], failureCodes ...string) (*Kind[P], error) {
+	if kind == "" {
+		return nil, errors.New("jobs: register: empty kind")
+	}
+	if h == nil {
+		return nil, fmt.Errorf("jobs: register %q: nil handler", kind)
+	}
+	declared := make(map[string]bool, len(failureCodes))
+	for _, code := range failureCodes {
+		if !codePattern.MatchString(code) {
+			return nil, fmt.Errorf("jobs: register %q: failure code %q is not lower-case snake case", kind, code)
+		}
+		if code == CodeInternal || code == CodeUnknownKind {
+			return nil, fmt.Errorf("jobs: register %q: failure code %q is reserved for the runner", kind, code)
+		}
+		declared[code] = true
+	}
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.started {
+		return nil, fmt.Errorf("jobs: register %q: runner already started", kind)
+	}
+	if _, ok := r.handlers[kind]; ok {
+		return nil, fmt.Errorf("jobs: register %q: kind already registered", kind)
+	}
+	run := func(ctx context.Context, payload string, publish func(json.RawMessage) error) (json.RawMessage, string, string) {
+		p, err := decodePayload[P]([]byte(payload))
+		if err != nil {
+			return nil, CodeInternal, "payload does not decode"
+		}
+		result, err := h(ctx, p, func(partial R) error {
+			data, err := publicJSON(partial)
+			if err != nil {
+				return err
+			}
+			return publish(data)
+		})
+		if err != nil {
+			var failure *Failure
+			if !errors.As(err, &failure) {
+				return nil, CodeInternal, "handler error"
+			}
+			if !declared[failure.Code] {
+				return nil, CodeInternal, "undeclared failure code"
+			}
+			return nil, failure.Code, "handler failure"
+		}
+		data, err := publicJSON(result)
+		if err != nil {
+			return nil, CodeInternal, "result does not encode"
+		}
+		return data, "", ""
+	}
+	check := func(payload []byte) bool {
+		_, err := decodePayload[P](payload)
+		return err == nil
+	}
+	r.handlers[kind] = handler{run: run, check: check}
+	return &Kind[P]{r: r, name: kind}, nil
+}
+
+// decodePayload decodes payload into P, refusing unknown fields.
+func decodePayload[P any](payload []byte) (P, error) {
+	var p P
+	dec := json.NewDecoder(bytes.NewReader(payload))
+	dec.DisallowUnknownFields()
+	err := dec.Decode(&p)
+	return p, err
+}
+
+// publicJSON returns v's PublicJSON, refusing anything that is not one JSON
+// value. Its error never quotes PublicJSON's error.
+func publicJSON(v Public) (json.RawMessage, error) {
+	data, err := v.PublicJSON()
+	if err != nil || !json.Valid(data) {
+		return nil, errors.New("jobs: result has no valid public JSON")
+	}
+	return data, nil
+}
+
+// Enqueue stores a queued job with payload and returns its id. A job
+// enqueued before Start waits for it.
+func (k *Kind[P]) Enqueue(ctx context.Context, payload P) (string, error) {
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return "", fmt.Errorf("jobs: enqueue %s: encode payload: %w", k.name, err)
+	}
+	return k.r.enqueue(ctx, k.name, data)
+}
+
+// Enqueue stores a queued job of kind with its JSON payload and returns its
+// id, as Kind.Enqueue does for a kind known at compile time. It returns
+// ErrUnknownKind for a kind with no registered handler and
+// ErrInvalidPayload for a payload that does not decode into the kind's
+// payload type; neither stores a job.
+func (r *Runner) Enqueue(ctx context.Context, kind string, payload json.RawMessage) (string, error) {
+	r.mu.Lock()
+	h, ok := r.handlers[kind]
+	r.mu.Unlock()
+	if !ok {
+		return "", ErrUnknownKind
+	}
+	if !h.check(payload) {
+		return "", ErrInvalidPayload
+	}
+	return r.enqueue(ctx, kind, payload)
+}
+
+// enqueue stores a queued job of kind with its encoded payload and wakes a
+// worker.
+func (r *Runner) enqueue(ctx context.Context, kind string, payload []byte) (string, error) {
+	id := store.NewID()
+	now := store.Now().String()
+	if err := db.New(r.st.Writer).CreateJob(ctx, db.CreateJobParams{
+		ID:        id,
+		Kind:      kind,
+		Payload:   string(payload),
+		CreatedAt: now,
+		UpdatedAt: now,
+	}); err != nil {
+		return "", fmt.Errorf("jobs: enqueue %s: %w", kind, err)
+	}
+	select {
+	case r.wake <- struct{}{}:
+	default: // every worker already has a token and will look again
+	}
+	return id, nil
+}
+
+// Start fails every job a previous process left running with
+// CodeInterrupted, then starts the workers. They stop when ctx is cancelled;
+// Wait waits for them. A job whose handler returns an error after ctx is
+// cancelled is left running, so the next Start fails it as interrupted.
+func (r *Runner) Start(ctx context.Context) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.started {
+		return errors.New("jobs: runner already started")
+	}
+	now := store.Now().String()
+	n, err := db.New(r.st.Writer).FailRunningJobs(ctx, db.FailRunningJobsParams{
+		Error: sql.NullString{String: CodeInterrupted, Valid: true},
+		Now:   sql.NullString{String: now, Valid: true},
+	})
+	if err != nil {
+		return fmt.Errorf("jobs: fail interrupted jobs: %w", err)
+	}
+	if n > 0 {
+		r.logger.WarnContext(ctx, "failed jobs interrupted by restart", "count", n)
+	}
+	r.started = true
+	for range r.workers {
+		r.wg.Add(1)
+		go r.work(ctx)
+	}
+	return nil
+}
+
+// Wait blocks until every worker has stopped.
+func (r *Runner) Wait() {
+	r.wg.Wait()
+}
+
+// Get returns the job with id, or ErrNotFound.
+func (r *Runner) Get(ctx context.Context, id string) (Job, error) {
+	row, err := db.New(r.st.Reader).GetJob(ctx, id)
+	if errors.Is(err, sql.ErrNoRows) {
+		return Job{}, ErrNotFound
+	}
+	if err != nil {
+		return Job{}, fmt.Errorf("jobs: read job: %w", err)
+	}
+	job := Job{ID: row.ID, Kind: row.Kind, Status: Status(row.Status)}
+	if row.Result.Valid {
+		job.Result = json.RawMessage(row.Result.String)
+	}
+	if row.Error.Valid {
+		job.Error = &row.Error.String
+	}
+	return job, nil
+}
+
+// work claims and runs queued jobs until ctx is cancelled, waiting for a
+// wake token whenever none is queued. A claim that fails with a database
+// error is retried with backoff rather than waiting for a token, so a job
+// already queued is not stranded by a transient error.
+func (r *Runner) work(ctx context.Context) {
+	defer r.wg.Done()
+	backoff := claimRetryMin
+	for ctx.Err() == nil {
+		job, err := r.claim(ctx, sql.NullString{String: store.Now().String(), Valid: true})
+		switch {
+		case err == nil:
+			backoff = claimRetryMin
+			r.run(ctx, job)
+			continue
+		case errors.Is(err, sql.ErrNoRows):
+			backoff = claimRetryMin
+			select {
+			case <-r.wake:
+			case <-ctx.Done():
+			}
+			continue
+		case ctx.Err() != nil:
+			return
+		}
+		r.logger.ErrorContext(ctx, "claim job failed; retrying", "reason", "database error", "retry_in", backoff)
+		timer := time.NewTimer(backoff)
+		select {
+		case <-timer.C:
+		case <-ctx.Done():
+			timer.Stop()
+		}
+		backoff = min(2*backoff, claimRetryMax)
+	}
+}
+
+// run runs a claimed job to completion. The final write is made even when
+// ctx has been cancelled, so a handler that finishes during shutdown is
+// recorded.
+func (r *Runner) run(ctx context.Context, job db.Job) {
+	write := context.WithoutCancel(ctx)
+	logger := r.logger.With("job_id", job.ID, "kind", job.Kind)
+	q := db.New(r.st.Writer)
+
+	h, ok := r.handlers[job.Kind] // read-only once started
+	if !ok {
+		logger.ErrorContext(ctx, "job failed", "code", CodeUnknownKind, "reason", "no handler registered for the kind")
+		r.fail(write, logger, job.ID, CodeUnknownKind)
+		return
+	}
+
+	publish := func(partial json.RawMessage) error {
+		n, err := q.PublishJobResult(ctx, db.PublishJobResultParams{
+			Result:    sql.NullString{String: string(partial), Valid: true},
+			UpdatedAt: store.Now().String(),
+			ID:        job.ID,
+		})
+		if err != nil {
+			return fmt.Errorf("jobs: publish result: %w", err)
+		}
+		if n != 1 {
+			return fmt.Errorf("jobs: publish result: job %s is not running", job.ID)
+		}
+		return nil
+	}
+
+	result, code, reason := h.run(ctx, job.Payload, publish)
+	if code != "" {
+		if ctx.Err() != nil {
+			logger.WarnContext(write, "job interrupted by shutdown; it fails at the next start")
+			return
+		}
+		level := slog.LevelInfo
+		if code == CodeInternal {
+			level = slog.LevelError
+		}
+		logger.Log(ctx, level, "job failed", "code", code, "reason", reason)
+		r.fail(write, logger, job.ID, code)
+		return
+	}
+
+	n, err := q.SucceedJob(write, db.SucceedJobParams{
+		Result: sql.NullString{String: string(result), Valid: true},
+		Now:    sql.NullString{String: store.Now().String(), Valid: true},
+		ID:     job.ID,
+	})
+	if err == nil && n != 1 {
+		err = errors.New("job is not running")
+	}
+	if err != nil {
+		logger.ErrorContext(write, "record job success", "error", err)
+	}
+}
+
+// fail records the job as failed with code. The record errors it logs come
+// from the database, never from a handler.
+func (r *Runner) fail(ctx context.Context, logger *slog.Logger, id, code string) {
+	n, err := db.New(r.st.Writer).FailJob(ctx, db.FailJobParams{
+		Error: sql.NullString{String: code, Valid: true},
+		Now:   sql.NullString{String: store.Now().String(), Valid: true},
+		ID:    id,
+	})
+	if err == nil && n != 1 {
+		err = errors.New("job is not running")
+	}
+	if err != nil {
+		logger.ErrorContext(ctx, "record job failure", "error", err)
+	}
+}

internal/jobs/jobs_test.go

@@ -0,0 +1,606 @@
+package jobs
+
+import (
+	"bytes"
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/db"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/migrations"
+)
+
+// sentinelSecret stands in for a credential a handler holds while it runs.
+const sentinelSecret = "sk-sentinel-5f2c9a"
+
+type countPayload struct {
+	Steps int `json:"steps"`
+}
+
+type countResult struct {
+	Done int `json:"done"`
+}
+
+func (c countResult) PublicJSON() ([]byte, error) { return json.Marshal(c) }
+
+func migratedStore(t *testing.T) *store.Store {
+	t.Helper()
+	ctx := context.Background()
+	st, err := store.Open(ctx, t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := st.Close(); err != nil {
+			t.Error(err)
+		}
+	})
+	if err := store.Migrate(ctx, st.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+	return st
+}
+
+func newRunner(t *testing.T, st *store.Store, workers int) *Runner {
+	t.Helper()
+	return newRunnerLogging(t, st, workers, io.Discard)
+}
+
+func newRunnerLogging(t *testing.T, st *store.Store, workers int, w io.Writer) *Runner {
+	t.Helper()
+	r, err := NewRunner(st, slog.New(slog.NewTextHandler(w, nil)), workers)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return r
+}
+
+// logBuffer collects log output written by concurrent workers.
+type logBuffer struct {
+	mu  sync.Mutex
+	buf bytes.Buffer
+}
+
+func (b *logBuffer) Write(p []byte) (int, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.buf.Write(p)
+}
+
+func (b *logBuffer) String() string {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.buf.String()
+}
+
+// start starts r and stops it when the test ends. The returned function
+// stops it early and waits for its workers.
+func start(t *testing.T, r *Runner) (stop func()) {
+	t.Helper()
+	ctx, cancel := context.WithCancel(context.Background())
+	if err := r.Start(ctx); err != nil {
+		cancel()
+		t.Fatal(err)
+	}
+	stop = func() {
+		cancel()
+		r.Wait()
+	}
+	t.Cleanup(stop)
+	return stop
+}
+
+func register[P any, R Public](t *testing.T, r *Runner, kind string, h Handler[P, R], failureCodes ...string) *Kind[P] {
+	t.Helper()
+	k, err := Register(r, kind, h, failureCodes...)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return k
+}
+
+func enqueue[P any](t *testing.T, k *Kind[P], payload P) string {
+	t.Helper()
+	id, err := k.Enqueue(context.Background(), payload)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return id
+}
+
+// waitFor polls Get until done accepts the job, failing after five seconds.
+func waitFor(t *testing.T, r *Runner, id string, done func(Job) bool) Job {
+	t.Helper()
+	deadline := time.Now().Add(5 * time.Second)
+	for {
+		job, err := r.Get(context.Background(), id)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if done(job) {
+			return job
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("job %s never reached the expected state; last %+v (result %s)", id, job, job.Result)
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+}
+
+func finished(j Job) bool { return j.Status == StatusSucceeded || j.Status == StatusFailed }
+
+// rawRow returns every column of the job's row joined, for leak checks.
+func rawRow(t *testing.T, st *store.Store, id string) string {
+	t.Helper()
+	var cols [10]any
+	ptrs := make([]any, len(cols))
+	for i := range cols {
+		ptrs[i] = &cols[i]
+	}
+	if err := st.Reader.QueryRow("SELECT * FROM jobs WHERE id = ?", id).Scan(ptrs...); err != nil {
+		t.Fatal(err)
+	}
+	return fmt.Sprint(cols[:]...)
+}
+
+func TestJobSucceeds(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	r := newRunner(t, st, 2)
+	count := register(t, r, "count", func(_ context.Context, p countPayload, _ func(countResult) error) (countResult, error) {
+		return countResult{Done: p.Steps}, nil
+	})
+	start(t, r)
+
+	id := enqueue(t, count, countPayload{Steps: 3})
+	job := waitFor(t, r, id, finished)
+	if job.ID != id || job.Kind != "count" || job.Status != StatusSucceeded || job.Error != nil {
+		t.Fatalf("job = %+v, want succeeded count job %s with no error", job, id)
+	}
+	if string(job.Result) != `{"done":3}` {
+		t.Errorf("result = %s, want {\"done\":3}", job.Result)
+	}
+
+	var startedAt, finishedAt, createdAt, updatedAt, payload string
+	if err := st.Reader.QueryRow("SELECT started_at, finished_at, created_at, updated_at, payload FROM jobs WHERE id = ?", id).
+		Scan(&startedAt, &finishedAt, &createdAt, &updatedAt, &payload); err != nil {
+		t.Fatal(err)
+	}
+	for name, v := range map[string]string{"started_at": startedAt, "finished_at": finishedAt, "created_at": createdAt, "updated_at": updatedAt} {
+		var ts store.Timestamp
+		if err := ts.Scan(v); err != nil {
+			t.Errorf("%s = %q: %v", name, v, err)
+		}
+	}
+	if payload != `{"steps":3}` {
+		t.Errorf("payload = %s, want {\"steps\":3}", payload)
+	}
+}
+
+func TestJobFailsWithFailureCode(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	r := newRunner(t, st, 1)
+	k := register(t, r, "suggest", func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		return countResult{}, fmt.Errorf("suggest: %w", &Failure{Code: "no_regulars"})
+	}, "no_regulars")
+	start(t, r)
+
+	job := waitFor(t, r, enqueue(t, k, countPayload{}), finished)
+	if job.Status != StatusFailed || job.Error == nil || *job.Error != "no_regulars" {
+		t.Fatalf("job = %+v, want failed with code no_regulars", job)
+	}
+	if job.Result != nil {
+		t.Errorf("result = %s, want none", job.Result)
+	}
+	var stored string
+	if err := st.Reader.QueryRow("SELECT error FROM jobs WHERE id = ?", job.ID).Scan(&stored); err != nil {
+		t.Fatal(err)
+	}
+	if stored != "no_regulars" {
+		t.Errorf("stored error = %q, want only the code", stored)
+	}
+}
+
+func TestUndeclaredFailureCodeIsInternal(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 1)
+	k := register(t, r, "suggest", func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		return countResult{}, &Failure{Code: "not_declared"}
+	}, "no_regulars")
+	start(t, r)
+
+	job := waitFor(t, r, enqueue(t, k, countPayload{}), finished)
+	if job.Status != StatusFailed || job.Error == nil || *job.Error != CodeInternal {
+		t.Fatalf("job = %+v, want failed with %q", job, CodeInternal)
+	}
+}
+
+// credential holds a secret the way config.Secret does: unexported, so
+// encoding/json cannot see it.
+type credential struct{ value string }
+
+func (credential) String() string { return "[REDACTED]" }
+
+// leakyResult holds a secret in exported and unexported fields; only
+// Dinners is public.
+type leakyResult struct {
+	Dinners []string
+	Key     credential
+	Token   string
+	apiKey  string
+}
+
+func (l leakyResult) PublicJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Dinners []string `json:"dinners"`
+	}{l.Dinners})
+}
+
+// badResult has no valid public JSON; its encoding error quotes a secret.
+type badResult struct{}
+
+func (badResult) PublicJSON() ([]byte, error) {
+	return nil, fmt.Errorf("encode with key %s", sentinelSecret)
+}
+
+// TestSecretsNeverStoredOrLogged proves a handler holding a secret cannot
+// surface it in the jobs row, Get's result or the log through its result,
+// partial results, *Failure, error text or result encoding error.
+func TestSecretsNeverStoredOrLogged(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	var logs logBuffer
+	r := newRunnerLogging(t, st, 1, &logs)
+	secretResult := leakyResult{Dinners: []string{"Tacos"}, Key: credential{sentinelSecret}, Token: sentinelSecret, apiKey: sentinelSecret}
+	typed := register(t, r, "typed", func(_ context.Context, _ countPayload, publish func(leakyResult) error) (leakyResult, error) {
+		if err := publish(secretResult); err != nil {
+			return leakyResult{}, err
+		}
+		return secretResult, nil
+	})
+	leakyError := register(t, r, "leaky-error", func(context.Context, countPayload, func(leakyResult) error) (leakyResult, error) {
+		return leakyResult{}, fmt.Errorf("GET https://api.example.com/v1?key=%s: 401 %s", sentinelSecret, sentinelSecret)
+	})
+	leakyFailure := register(t, r, "leaky-failure", func(context.Context, countPayload, func(leakyResult) error) (leakyResult, error) {
+		return leakyResult{}, &Failure{Code: sentinelSecret}
+	}, "quota_exceeded")
+	failure := register(t, r, "failure", func(context.Context, countPayload, func(leakyResult) error) (leakyResult, error) {
+		return leakyResult{}, fmt.Errorf("call with key %s: %w", sentinelSecret, &Failure{Code: "quota_exceeded"})
+	}, "quota_exceeded")
+	badEncoding := register(t, r, "bad-encoding", func(context.Context, countPayload, func(badResult) error) (badResult, error) {
+		return badResult{}, nil
+	})
+	stop := start(t, r)
+
+	cases := []struct {
+		kind       *Kind[countPayload]
+		wantStatus Status
+		wantResult string
+		wantError  string
+	}{
+		{typed, StatusSucceeded, `{"dinners":["Tacos"]}`, ""},
+		{leakyError, StatusFailed, "", CodeInternal},
+		{leakyFailure, StatusFailed, "", CodeInternal},
+		{failure, StatusFailed, "", "quota_exceeded"},
+		{badEncoding, StatusFailed, "", CodeInternal},
+	}
+	var ids []string
+	for _, c := range cases {
+		job := waitFor(t, r, enqueue(t, c.kind, countPayload{}), finished)
+		ids = append(ids, job.ID)
+		gotError := ""
+		if job.Error != nil {
+			gotError = *job.Error
+		}
+		if job.Status != c.wantStatus || string(job.Result) != c.wantResult || gotError != c.wantError {
+			t.Errorf("%s job = %+v (result %s), want %s with result %q and error %q", job.Kind, job, job.Result, c.wantStatus, c.wantResult, c.wantError)
+		}
+		body, err := json.Marshal(job)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if strings.Contains(string(body), sentinelSecret) {
+			t.Errorf("%s job as served contains the secret: %s", job.Kind, body)
+		}
+	}
+	stop()
+	for _, id := range ids {
+		if row := rawRow(t, st, id); strings.Contains(row, sentinelSecret) {
+			t.Errorf("job %s row contains the secret: %s", id, row)
+		}
+	}
+	if strings.Contains(logs.String(), sentinelSecret) {
+		t.Errorf("log contains the secret:\n%s", logs.String())
+	}
+	if !strings.Contains(logs.String(), "code="+CodeInternal) {
+		t.Errorf("log does not record the internal_error code:\n%s", logs.String())
+	}
+}
+
+func TestProgressiveResultsVisibleMidRun(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 1)
+	release := make(chan struct{})
+	k := register(t, r, "draft", func(ctx context.Context, p countPayload, publish func(countResult) error) (countResult, error) {
+		for i := 1; i < p.Steps; i++ {
+			if err := publish(countResult{Done: i}); err != nil {
+				return countResult{}, err
+			}
+			select {
+			case <-release:
+			case <-ctx.Done():
+				return countResult{}, ctx.Err()
+			}
+		}
+		return countResult{Done: p.Steps}, nil
+	})
+	start(t, r)
+
+	id := enqueue(t, k, countPayload{Steps: 3})
+	for step := 1; step < 3; step++ {
+		want := fmt.Sprintf(`{"done":%d}`, step)
+		job := waitFor(t, r, id, func(j Job) bool { return string(j.Result) == want })
+		if job.Status != StatusRunning || job.Error != nil {
+			t.Fatalf("mid-run job = %+v, want running with no error", job)
+		}
+		release <- struct{}{}
+	}
+	job := waitFor(t, r, id, finished)
+	if job.Status != StatusSucceeded || string(job.Result) != `{"done":3}` {
+		t.Fatalf("job = %+v (result %s), want succeeded with {\"done\":3}", job, job.Result)
+	}
+}
+
+func TestRestartFailsInterruptedJobsAndRunsQueuedOnes(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+
+	first := newRunner(t, st, 1)
+	started := make(chan struct{})
+	k := register(t, first, "slow", func(ctx context.Context, _ countPayload, publish func(countResult) error) (countResult, error) {
+		if err := publish(countResult{Done: 1}); err != nil {
+			return countResult{}, err
+		}
+		close(started)
+		<-ctx.Done()
+		return countResult{}, ctx.Err()
+	})
+	stop := start(t, first)
+	interrupted := enqueue(t, k, countPayload{})
+	<-started
+	waiting := enqueue(t, k, countPayload{}) // the only worker is busy
+	stop()
+
+	if job := waitFor(t, first, interrupted, func(Job) bool { return true }); job.Status != StatusRunning {
+		t.Fatalf("after shutdown job = %+v, want left running", job)
+	}
+
+	second := newRunner(t, st, 1)
+	register(t, second, "slow", func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		return countResult{Done: 9}, nil
+	})
+	start(t, second)
+
+	job := waitFor(t, second, interrupted, finished)
+	if job.Status != StatusFailed || job.Error == nil || *job.Error != "interrupted by restart" {
+		t.Errorf("interrupted job = %+v, want failed with %q", job, "interrupted by restart")
+	}
+	if string(job.Result) != `{"done":1}` {
+		t.Errorf("interrupted job result = %s, want the last partial result kept", job.Result)
+	}
+	if job := waitFor(t, second, waiting, finished); job.Status != StatusSucceeded {
+		t.Errorf("queued job = %+v, want run by the new runner", job)
+	}
+}
+
+func TestWorkerPoolIsBounded(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 2)
+	var running, peak atomic.Int32
+	release := make(chan struct{})
+	k := register(t, r, "busy", func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		n := running.Add(1)
+		for {
+			p := peak.Load()
+			if n <= p || peak.CompareAndSwap(p, n) {
+				break
+			}
+		}
+		<-release
+		running.Add(-1)
+		return countResult{}, nil
+	})
+	start(t, r)
+
+	ids := make([]string, 5)
+	for i := range ids {
+		ids[i] = enqueue(t, k, countPayload{})
+	}
+	deadline := time.Now().Add(5 * time.Second)
+	for running.Load() < 2 {
+		if time.Now().After(deadline) {
+			t.Fatal("two workers never ran at once")
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+	close(release)
+	for _, id := range ids {
+		if job := waitFor(t, r, id, finished); job.Status != StatusSucceeded {
+			t.Errorf("job = %+v, want succeeded", job)
+		}
+	}
+	if got := peak.Load(); got != 2 {
+		t.Errorf("peak concurrent jobs = %d, want 2", got)
+	}
+}
+
+func TestJobWithoutHandlerFails(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	old := newRunner(t, st, 1)
+	k := register(t, old, "retired", func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		return countResult{}, nil
+	})
+	id := enqueue(t, k, countPayload{}) // never started
+
+	r := newRunner(t, st, 1)
+	start(t, r)
+	job := waitFor(t, r, id, finished)
+	if job.Status != StatusFailed || job.Error == nil || *job.Error != CodeUnknownKind {
+		t.Errorf("job = %+v, want failed for a missing handler", job)
+	}
+}
+
+func TestGetUnknownID(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 1)
+	if _, err := r.Get(context.Background(), store.NewID()); !errors.Is(err, ErrNotFound) {
+		t.Errorf("Get unknown id error = %v, want ErrNotFound", err)
+	}
+}
+
+func TestRegisterRefusesBadRegistrations(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 1)
+	h := func(context.Context, countPayload, func(countResult) error) (countResult, error) {
+		return countResult{}, nil
+	}
+	register(t, r, "count", h)
+
+	if _, err := Register(r, "count", h); err == nil {
+		t.Error("duplicate kind registered")
+	}
+	if _, err := Register(r, "", h); err == nil {
+		t.Error("empty kind registered")
+	}
+	if _, err := Register[countPayload, countResult](r, "nil", nil); err == nil {
+		t.Error("nil handler registered")
+	}
+	for _, code := range []string{"", "Bad Code", "sk-sentinel", CodeInternal, CodeInterrupted, CodeUnknownKind} {
+		if _, err := Register(r, "code", h, code); err == nil {
+			t.Errorf("failure code %q accepted", code)
+		}
+	}
+	start(t, r)
+	if _, err := Register(r, "late", h); err == nil {
+		t.Error("kind registered after Start")
+	}
+	if err := r.Start(context.Background()); err == nil {
+		t.Error("second Start succeeded")
+	}
+}
+
+func TestNewRunnerRefusesBadConfig(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	if _, err := NewRunner(st, logger, 0); err == nil {
+		t.Error("zero workers accepted")
+	}
+	if _, err := NewRunner(nil, logger, 1); err == nil {
+		t.Error("nil store accepted")
+	}
+	if _, err := NewRunner(st, nil, 1); err == nil {
+		t.Error("nil logger accepted")
+	}
+}
+
+func TestNoopSucceeds(t *testing.T) {
+	t.Parallel()
+	r := newRunner(t, migratedStore(t), 1)
+	builtins, err := RegisterBuiltins(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	start(t, r)
+
+	job := waitFor(t, r, enqueue(t, builtins.Noop, NoopPayload{}), finished)
+	if job.Kind != KindNoop || job.Status != StatusSucceeded || string(job.Result) != `{"ok":true}` || job.Error != nil {
+		t.Errorf("noop job = %+v (result %s), want succeeded with {\"ok\":true}", job, job.Result)
+	}
+}
+
+func TestClaimErrorIsRetried(t *testing.T) {
+	st := migratedStore(t)
+	logs := &logBuffer{}
+	r := newRunnerLogging(t, st, 1, logs)
+	k := register(t, r, "count", func(ctx context.Context, p countPayload, publish func(countResult) error) (countResult, error) {
+		return countResult{Done: p.Steps}, nil
+	})
+	id := enqueue(t, k, countPayload{Steps: 3})
+	// Drop the wake token, as for a job queued before a restart, so only
+	// the retry can find the job.
+	<-r.wake
+
+	var claims atomic.Int32
+	claim := r.claim
+	r.claim = func(ctx context.Context, now sql.NullString) (db.Job, error) {
+		if claims.Add(1) == 1 {
+			return db.Job{}, errors.New("database is locked " + sentinelSecret)
+		}
+		return claim(ctx, now)
+	}
+	start(t, r)
+
+	job := waitFor(t, r, id, finished)
+	if job.Status != StatusSucceeded || string(job.Result) != `{"done":3}` {
+		t.Fatalf("job = %+v (result %s), want succeeded with {\"done\":3}", job, job.Result)
+	}
+	if n := claims.Load(); n < 2 {
+		t.Fatalf("claims = %d, want a retry after the error", n)
+	}
+	out := logs.String()
+	if !strings.Contains(out, "claim job failed; retrying") {
+		t.Fatalf("claim error not logged: %s", out)
+	}
+	if strings.Contains(out, sentinelSecret) {
+		t.Fatalf("claim error text logged: %s", out)
+	}
+}
+
+func TestRunnerEnqueueByKindName(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	r := newRunner(t, st, 1)
+	register(t, r, "count", func(_ context.Context, p countPayload, _ func(countResult) error) (countResult, error) {
+		return countResult{Done: p.Steps}, nil
+	})
+	ctx := context.Background()
+
+	if _, err := r.Enqueue(ctx, "no_such_kind", json.RawMessage(`{}`)); !errors.Is(err, ErrUnknownKind) {
+		t.Errorf("unknown kind error = %v, want ErrUnknownKind", err)
+	}
+	for _, payload := range []string{`{"steps":"three"}`, `{"other":1}`, `[]`, ``} {
+		if _, err := r.Enqueue(ctx, "count", json.RawMessage(payload)); !errors.Is(err, ErrInvalidPayload) {
+			t.Errorf("payload %q error = %v, want ErrInvalidPayload", payload, err)
+		}
+	}
+	var n int
+	if err := st.Reader.QueryRow("SELECT COUNT(*) FROM jobs").Scan(&n); err != nil {
+		t.Fatal(err)
+	}
+	if n != 0 {
+		t.Errorf("refused enqueues stored %d jobs, want 0", n)
+	}
+
+	id, err := r.Enqueue(ctx, "count", json.RawMessage(`{"steps":3}`))
+	if err != nil {
+		t.Fatal(err)
+	}
+	start(t, r)
+	job := waitFor(t, r, id, finished)
+	if job.Kind != "count" || job.Status != StatusSucceeded || string(job.Result) != `{"done":3}` {
+		t.Errorf("job = %+v (result %s), want succeeded with {\"done\":3}", job, job.Result)
+	}
+}

internal/server/jobs.go

@@ -0,0 +1,107 @@
+package server
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+)
+
+// maxJobBody bounds a POST /jobs request body.
+const maxJobBody = 64 << 10
+
+// jobRequest is the POST /jobs body. Payload is required; a job kind that
+// takes no input is sent the empty object {}.
+type jobRequest struct {
+	Kind    string          `json:"kind"`
+	Payload json.RawMessage `json:"payload"`
+}
+
+// jobCreated is the POST /jobs response.
+type jobCreated struct {
+	ID string `json:"id"`
+}
+
+// postJob serves POST /api/v1/jobs: it enqueues a job of a registered kind
+// and returns 202 with its id, which GET /api/v1/jobs/{id} reports on.
+func postJob(logger *slog.Logger, runner *jobs.Runner) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		req, err := decodeJobRequest(http.MaxBytesReader(w, r.Body, maxJobBody))
+		if err != nil {
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_request", err.Error())
+			return
+		}
+		id, err := runner.Enqueue(r.Context(), req.Kind, req.Payload)
+		switch {
+		case errors.Is(err, jobs.ErrUnknownKind):
+			writeError(w, r, logger, http.StatusBadRequest, "unknown_kind", "unknown job kind")
+			return
+		case errors.Is(err, jobs.ErrInvalidPayload):
+			writeError(w, r, logger, http.StatusBadRequest, "invalid_payload", "payload does not match the job kind")
+			return
+		case err != nil:
+			logger.ErrorContext(r.Context(), "enqueue job", "kind", req.Kind, "error", err)
+			writeError(w, r, logger, http.StatusInternalServerError, "internal", "internal error")
+			return
+		}
+		writeJSON(w, r, logger, http.StatusAccepted, jobCreated{ID: id})
+	}
+}
+
+// decodeJobRequest reads a single JSON object with a non-empty kind and a
+// payload, refusing unknown fields, an omitted or null payload and trailing
+// data.
+func decodeJobRequest(body io.Reader) (jobRequest, error) {
+	data, err := io.ReadAll(body)
+	if err != nil {
+		var tooLarge *http.MaxBytesError
+		if errors.As(err, &tooLarge) {
+			return jobRequest{}, fmt.Errorf("request body exceeds %d bytes", tooLarge.Limit)
+		}
+		return jobRequest{}, errors.New("cannot read request body")
+	}
+	var req jobRequest
+	dec := json.NewDecoder(bytes.NewReader(data))
+	dec.DisallowUnknownFields()
+	if err := dec.Decode(&req); err != nil {
+		return jobRequest{}, errors.New("request body must be a JSON object with kind and payload")
+	}
+	if _, err := dec.Token(); err != io.EOF {
+		return jobRequest{}, errors.New("request body must be a single JSON object")
+	}
+	if req.Kind == "" {
+		return jobRequest{}, errors.New("kind: required")
+	}
+	if req.Payload == nil {
+		return jobRequest{}, errors.New("payload: required")
+	}
+	if bytes.Equal(req.Payload, []byte("null")) {
+		return jobRequest{}, errors.New("payload: must not be null")
+	}
+	return req, nil
+}
+
+// getJob serves GET /api/v1/jobs/{id}: the job's id, kind, status, latest
+// result and error.
+func getJob(logger *slog.Logger, runner *jobs.Runner) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		job, err := runner.Get(r.Context(), chi.URLParam(r, "id"))
+		if errors.Is(err, jobs.ErrNotFound) {
+			writeError(w, r, logger, http.StatusNotFound, "not_found", "job not found")
+			return
+		}
+		if err != nil {
+			logger.ErrorContext(r.Context(), "get job", "error", err)
+			writeError(w, r, logger, http.StatusInternalServerError, "internal", "internal error")
+			return
+		}
+		writeJSON(w, r, logger, http.StatusOK, job)
+	}
+}

internal/server/jobs_test.go

@@ -0,0 +1,246 @@
+package server
+
+import (
+	"context"
+	"encoding/json"
+	"maps"
+	"net/http"
+	"net/http/httptest"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
+)
+
+type draftPayload struct{}
+
+type draftResult struct {
+	Days int `json:"days"`
+}
+
+func (d draftResult) PublicJSON() ([]byte, error) { return json.Marshal(d) }
+
+// startedRunner registers a "draft" kind that publishes {"days":1}, waits
+// for release and returns {"days":7}, or fails with a *jobs.Failure when
+// fail is closed first. It starts the runner and stops it when the test ends.
+func startedRunner(t *testing.T, release, fail <-chan struct{}) (*jobs.Runner, *jobs.Kind[draftPayload]) {
+	t.Helper()
+	runner := newTestRunner(t)
+	kind, err := jobs.Register(runner, "draft", func(ctx context.Context, _ draftPayload, publish func(draftResult) error) (draftResult, error) {
+		if err := publish(draftResult{Days: 1}); err != nil {
+			return draftResult{}, err
+		}
+		select {
+		case <-release:
+			return draftResult{Days: 7}, nil
+		case <-fail:
+			return draftResult{}, &jobs.Failure{Code: "no_regulars"}
+		case <-ctx.Done():
+			return draftResult{}, ctx.Err()
+		}
+	}, "no_regulars")
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	if err := runner.Start(ctx); err != nil {
+		cancel()
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		cancel()
+		runner.Wait()
+	})
+	return runner, kind
+}
+
+// pollJob GETs the job until want accepts the body, failing after five
+// seconds.
+func pollJob(t *testing.T, h http.Handler, id string, want func(map[string]any) bool) map[string]any {
+	t.Helper()
+	deadline := time.Now().Add(5 * time.Second)
+	for {
+		rec, body := serve(t, h, signedIn(http.MethodGet, "/api/v1/jobs/"+id, nil))
+		if rec.Code != http.StatusOK {
+			t.Fatalf("status = %d, want 200: %s", rec.Code, rec.Body)
+		}
+		if want(body) {
+			if keys := slices.Sorted(maps.Keys(body)); !slices.Equal(keys, []string{"error", "id", "kind", "result", "status"}) {
+				t.Errorf("body fields = %v, want id, kind, status, result, error", keys)
+			}
+			return body
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("job %s never reached the expected state; last %v", id, body)
+		}
+		time.Sleep(5 * time.Millisecond)
+	}
+}
+
+func resultDays(body map[string]any) float64 {
+	result, _ := body["result"].(map[string]any)
+	days, _ := result["days"].(float64)
+	return days
+}
+
+func TestGetJobShowsProgressThenResult(t *testing.T) {
+	t.Parallel()
+	release := make(chan struct{})
+	runner, kind := startedRunner(t, release, nil)
+	router := newTestRouterWith(t, "dev", newTestSettings(t), runner)
+	id, err := kind.Enqueue(context.Background(), draftPayload{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	mid := pollJob(t, router, id, func(b map[string]any) bool { return resultDays(b) == 1 })
+	if mid["id"] != id || mid["kind"] != "draft" || mid["status"] != "running" || mid["error"] != nil {
+		t.Errorf("mid-run body = %v, want running draft job %s with no error", mid, id)
+	}
+
+	close(release)
+	done := pollJob(t, router, id, func(b map[string]any) bool { return b["status"] == "succeeded" })
+	if resultDays(done) != 7 || done["error"] != nil {
+		t.Errorf("finished body = %v, want result {\"days\":7} and no error", done)
+	}
+}
+
+func TestGetJobShowsFailure(t *testing.T) {
+	t.Parallel()
+	fail := make(chan struct{})
+	close(fail)
+	runner, kind := startedRunner(t, nil, fail)
+	router := newTestRouterWith(t, "dev", newTestSettings(t), runner)
+	id, err := kind.Enqueue(context.Background(), draftPayload{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	body := pollJob(t, router, id, func(b map[string]any) bool { return b["status"] == "failed" })
+	if body["error"] != "no_regulars" {
+		t.Errorf("error = %v, want the Failure code", body["error"])
+	}
+}
+
+func TestGetJobUnknownIDIsNotFound(t *testing.T) {
+	t.Parallel()
+	router := newTestRouter(t, "dev")
+
+	rec, _ := serve(t, router, signedIn(http.MethodGet, "/api/v1/jobs/"+store.NewID(), nil))
+	if rec.Code != http.StatusNotFound {
+		t.Fatalf("status = %d, want 404", rec.Code)
+	}
+	var body errorBody
+	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
+		t.Fatal(err)
+	}
+	if want := (errorBody{Error: apiError{Code: "not_found", Message: "job not found"}}); body != want {
+		t.Errorf("body = %+v, want %+v", body, want)
+	}
+}
+
+func TestGetJobRequiresSession(t *testing.T) {
+	t.Parallel()
+	router := newTestRouter(t, "dev")
+
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/api/v1/jobs/"+store.NewID(), nil))
+	if rec.Code != http.StatusUnauthorized {
+		t.Errorf("status = %d, want 401", rec.Code)
+	}
+}
+
+// TestPostJobThenGetProgressAndResult drives the whole flow over the
+// router: POST enqueues a progressive "draft" job, GET reads its partial
+// result while the handler is held mid-run, then its final result.
+func TestPostJobThenGetProgressAndResult(t *testing.T) {
+	t.Parallel()
+	release := make(chan struct{})
+	runner, _ := startedRunner(t, release, nil)
+	router := newTestRouterWith(t, "dev", newTestSettings(t), runner)
+
+	rec, body := serve(t, router, signedIn(http.MethodPost, "/api/v1/jobs", strings.NewReader(`{"kind":"draft","payload":{}}`)))
+	if rec.Code != http.StatusAccepted {
+		t.Fatalf("status = %d, want 202: %s", rec.Code, rec.Body)
+	}
+	id, _ := body["id"].(string)
+	if keys := slices.Sorted(maps.Keys(body)); !slices.Equal(keys, []string{"id"}) || id == "" {
+		t.Fatalf("body = %v, want only a job id", body)
+	}
+
+	mid := pollJob(t, router, id, func(b map[string]any) bool { return resultDays(b) == 1 })
+	if mid["id"] != id || mid["kind"] != "draft" || mid["status"] != "running" || mid["error"] != nil {
+		t.Errorf("mid-run body = %v, want running draft job %s with no error", mid, id)
+	}
+
+	close(release)
+	done := pollJob(t, router, id, func(b map[string]any) bool { return b["status"] == "succeeded" })
+	if done["id"] != id || resultDays(done) != 7 || done["error"] != nil {
+		t.Errorf("finished body = %v, want result {\"days\":7} and no error", done)
+	}
+}
+
+func TestPostJobRefusesBadRequests(t *testing.T) {
+	t.Parallel()
+	runner, _ := startedRunner(t, nil, nil)
+	router := newTestRouterWith(t, "dev", newTestSettings(t), runner)
+
+	for _, tc := range []struct {
+		name, body, code, message string
+	}{
+		{"unknown kind", `{"kind":"no_such_kind","payload":{}}`, "unknown_kind", "unknown job kind"},
+		{"payload for another type", `{"kind":"draft","payload":{"days":3}}`, "invalid_payload", "payload does not match the job kind"},
+		{"payload not an object", `{"kind":"draft","payload":[1]}`, "invalid_payload", "payload does not match the job kind"},
+		{"missing payload", `{"kind":"draft"}`, "invalid_request", "payload: required"},
+		{"null payload", `{"kind":"draft","payload":null}`, "invalid_request", "payload: must not be null"},
+		{"missing kind", `{"payload":{}}`, "invalid_request", "kind: required"},
+		{"empty body", ``, "invalid_request", "request body must be a JSON object with kind and payload"},
+		{"not an object", `["draft"]`, "invalid_request", "request body must be a JSON object with kind and payload"},
+		{"unknown field", `{"kind":"draft","payload":{},"extra":1}`, "invalid_request", "request body must be a JSON object with kind and payload"},
+		{"trailing data", `{"kind":"draft","payload":{}} {}`, "invalid_request", "request body must be a single JSON object"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			rec := httptest.NewRecorder()
+			router.ServeHTTP(rec, signedIn(http.MethodPost, "/api/v1/jobs", strings.NewReader(tc.body)))
+			if rec.Code != http.StatusBadRequest {
+				t.Fatalf("status = %d, want 400: %s", rec.Code, rec.Body)
+			}
+			var body errorBody
+			if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
+				t.Fatal(err)
+			}
+			if want := (errorBody{Error: apiError{Code: tc.code, Message: tc.message}}); body != want {
+				t.Errorf("body = %+v, want %+v", body, want)
+			}
+		})
+	}
+}
+
+func TestPostJobNeedsSessionAndCSRF(t *testing.T) {
+	t.Parallel()
+	router := newTestRouter(t, "dev")
+	const body = `{"kind":"noop","payload":{}}`
+
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, httptest.NewRequest(http.MethodPost, "/api/v1/jobs", strings.NewReader(body)))
+	if rec.Code != http.StatusUnauthorized || rec.Body.String() != unauthenticatedJSON {
+		t.Errorf("no session: %d %s, want 401 %s", rec.Code, rec.Body, unauthenticatedJSON)
+	}
+
+	for _, header := range []string{"", "wrong-token"} {
+		req := httptest.NewRequest(http.MethodPost, "/api/v1/jobs", strings.NewReader(body))
+		req.AddCookie(validSessionCookie)
+		if header != "" {
+			req.Header.Set(CSRFHeader, header)
+		}
+		rec := httptest.NewRecorder()
+		router.ServeHTTP(rec, req)
+		if rec.Code != http.StatusForbidden || rec.Body.String() != csrfJSON {
+			t.Errorf("CSRF header %q: %d %s, want 403 %s", header, rec.Code, rec.Body, csrfJSON)
+		}
+	}
+}

internal/server/login_test.go

@@ -83,7 +83,7 @@ func newLoginRouter(t *testing.T, issuer string) http.Handler {
 		t.Fatal(err)
 	}
 	r, err := NewRouter(logger, "dev", trusted, flow, sessions, newTestSettings(t),
-		fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestRunner(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/origin_test.go

@@ -45,7 +45,7 @@ func newOriginRouter(t *testing.T, logs io.Writer) http.Handler {
 	}
 	logger := slog.New(forwarded.LogHandler(slog.NewJSONHandler(logs, nil)))
 	r, err := NewRouter(logger, "dev", trusted, probeAuth{}, stubSessions{}, newTestSettings(t),
-		fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestRunner(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/server/server.go

@@ -13,6 +13,7 @@ import (
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/forwarded"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/frontend"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
 )
 
 // reservedPrefixes are owned by the API router and are never answered with the
@@ -28,13 +29,17 @@ type RouteMounter interface {
 // has its client address and scheme resolved, honouring forwarded headers
 // only from a peer in trusted (see resolveOrigin). version is reported by
 // GET /health; auth mounts the /auth routes; sessions guards /api/v1 and
-// /media; settings serves /api/v1/settings/household; assets is the web build
+// /media; settings serves /api/v1/settings/household; runner serves
+// POST /api/v1/jobs and GET /api/v1/jobs/{id}; assets is the web build
 // served for every other GET. /health, /auth and the web build are public.
 // Requests to /api/v1 other than GET also need the session's CSRF token in CSRFHeader.
-func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, auth RouteMounter, sessions SessionLookup, settings *household.SettingsService, assets fs.FS) (http.Handler, error) {
+func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, auth RouteMounter, sessions SessionLookup, settings *household.SettingsService, runner *jobs.Runner, assets fs.FS) (http.Handler, error) {
 	if settings == nil {
 		return nil, errors.New("server: nil household settings service")
 	}
+	if runner == nil {
+		return nil, errors.New("server: nil job runner")
+	}
 	notFound := apiErrorHandler(logger, http.StatusNotFound, "not_found", "not found")
 	methodNotAllowed := apiErrorHandler(logger, http.StatusMethodNotAllowed, "method_not_allowed", "method not allowed")
 
@@ -63,6 +68,8 @@ func NewRouter(logger *slog.Logger, version string, trusted forwarded.Trusted, a
 	apiV1.Get("/me", me(logger))
 	apiV1.Get("/settings/household", getHouseholdSettings(logger, settings))
 	apiV1.Patch("/settings/household", patchHouseholdSettings(logger, settings))
+	apiV1.Post("/jobs", postJob(logger, runner))
+	apiV1.Get("/jobs/{id}", getJob(logger, runner))
 	r.Route("/api", func(r chi.Router) {
 		r.MethodNotAllowed(methodNotAllowed)
 		r.NotFound(notFound)

internal/server/server_test.go

@@ -15,6 +15,7 @@ import (
 	"github.com/go-chi/chi/v5"
 
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/household"
+	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/jobs"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/internal/store"
 	"code.cubecraftlabs.com/Maniacs_Mansion/Meal-Quest/migrations"
 )
@@ -27,17 +28,17 @@ const (
 
 func newTestRouter(t *testing.T, version string) http.Handler {
 	t.Helper()
-	return newTestRouterWith(t, version, newTestSettings(t))
+	return newTestRouterWith(t, version, newTestSettings(t), newTestRunner(t))
 }
 
-func newTestRouterWith(t *testing.T, version string, settings *household.SettingsService) http.Handler {
+func newTestRouterWith(t *testing.T, version string, settings *household.SettingsService, runner *jobs.Runner) http.Handler {
 	t.Helper()
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
 	assets := fstest.MapFS{
 		"index.html":             {Data: []byte(fixtureIndex)},
 		"assets/index-AbC123.js": {Data: []byte(fixtureAsset)},
 	}
-	r, err := NewRouter(logger, version, nil, stubAuth{}, stubSessions{}, settings, assets)
+	r, err := NewRouter(logger, version, nil, stubAuth{}, stubSessions{}, settings, runner, assets)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -70,9 +71,8 @@ func TestAuthRoutesMounted(t *testing.T) {
 	}
 }
 
-// newTestSettings returns a settings service over a migrated temp database
-// seeded with zone America/New_York.
-func newTestSettings(t *testing.T) *household.SettingsService {
+// newTestStore returns a migrated temp database, closed when the test ends.
+func newTestStore(t *testing.T) *store.Store {
 	t.Helper()
 	ctx := context.Background()
 	st, err := store.Open(ctx, t.TempDir())
@@ -87,21 +87,49 @@ func newTestSettings(t *testing.T) *household.SettingsService {
 	if err := store.Migrate(ctx, st.Writer, migrations.FS); err != nil {
 		t.Fatal(err)
 	}
-	if err := household.SeedSettings(ctx, st, "America/New_York"); err != nil {
+	return st
+}
+
+// newTestSettings returns a settings service over a migrated temp database
+// seeded with zone America/New_York.
+func newTestSettings(t *testing.T) *household.SettingsService {
+	t.Helper()
+	st := newTestStore(t)
+	if err := household.SeedSettings(context.Background(), st, "America/New_York"); err != nil {
 		t.Fatal(err)
 	}
 	return household.NewSettingsService(st)
 }
 
+// newTestRunner returns an unstarted job runner over a migrated temp
+// database.
+func newTestRunner(t *testing.T) *jobs.Runner {
+	t.Helper()
+	runner, err := jobs.NewRunner(newTestStore(t), slog.New(slog.NewTextHandler(io.Discard, nil)), 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return runner
+}
+
 func TestNewRouterRequiresSettings(t *testing.T) {
 	t.Parallel()
 
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
-	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, nil, fstest.MapFS{"index.html": {}}); err == nil {
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, nil, newTestRunner(t), fstest.MapFS{"index.html": {}}); err == nil {
 		t.Fatal("NewRouter accepted a nil settings service")
 	}
 }
 
+func TestNewRouterRequiresJobRunner(t *testing.T) {
+	t.Parallel()
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	if _, err := NewRouter(logger, "dev", nil, stubAuth{}, stubSessions{}, newTestSettings(t), nil, fstest.MapFS{"index.html": {}}); err == nil {
+		t.Fatal("NewRouter accepted a nil job runner")
+	}
+}
+
 func TestHealth(t *testing.T) {
 	t.Parallel()
 

internal/server/settings_test.go

@@ -84,7 +84,7 @@ func TestGetHouseholdSettings(t *testing.T) {
 func TestPatchHouseholdSettings(t *testing.T) {
 	t.Parallel()
 	settings := newTestSettings(t)
-	router := newTestRouterWith(t, "dev", settings)
+	router := newTestRouterWith(t, "dev", settings, newTestRunner(t))
 
 	var notified []household.Settings
 	settings.Subscribe(func(s household.Settings) { notified = append(notified, s) })
@@ -146,7 +146,7 @@ func TestPatchHouseholdSettingsRejected(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 			settings := newTestSettings(t)
-			router := newTestRouterWith(t, "dev", settings)
+			router := newTestRouterWith(t, "dev", settings, newTestRunner(t))
 			notified := 0
 			settings.Subscribe(func(household.Settings) { notified++ })
 
@@ -216,7 +216,7 @@ func TestHouseholdSettingsWithRealSession(t *testing.T) {
 	}
 	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
 	router, err := NewRouter(logger, "dev", nil, stubAuth{}, sessions, household.NewSettingsService(st),
-		fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
+		newTestRunner(t), fstest.MapFS{"index.html": {Data: []byte(fixtureIndex)}})
 	if err != nil {
 		t.Fatal(err)
 	}

internal/store/migrate_test.go

@@ -175,8 +175,8 @@ func TestMigrateEmbeddedMigrations(t *testing.T) {
 	if err := Migrate(context.Background(), s.Writer, migrations.FS); err != nil {
 		t.Fatal(err)
 	}
-	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by" {
-		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by", got)
+	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai" {
+		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai", got)
 	}
 }
 
@@ -196,8 +196,8 @@ func TestMigrateBootstrapThenEmbeddedInitApplies(t *testing.T) {
 	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
 		t.Fatal(err)
 	}
-	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by" {
-		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by", got)
+	if got := versions(migrationRows(t, s)); got != "0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai" {
+		t.Errorf("versions = %q, want 0000_bootstrap,0001_init,0002_household_settings_updated_by,0003_jobs_status,0004_ai_provider_presets,0005_ai_provider_xai", got)
 	}
 	if !tableExists(t, s, "dinners") {
 		t.Error("table from 0001_init was not created")
@@ -262,3 +262,227 @@ func TestMigrateReopenSameDataDirIsNoOp(t *testing.T) {
 		t.Errorf("schema changed on reopen:\n got %v\nwant %v", afterSchema, beforeSchema)
 	}
 }
+
+// TestMigrateJobsStatusMapsLegacyRows upgrades a database holding jobs in
+// every 0001 status and checks 0003 carries each row over with its status
+// mapped and every other column unchanged.
+func TestMigrateJobsStatusMapsLegacyRows(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	before := fstest.MapFS{}
+	for _, name := range []string{"0000_bootstrap.sql", "0001_init.sql", "0002_household_settings_updated_by.sql"} {
+		body, err := fs.ReadFile(migrations.FS, name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		before[name] = &fstest.MapFile{Data: body}
+	}
+	if err := Migrate(ctx, s.Writer, before); err != nil {
+		t.Fatal(err)
+	}
+	legacy := map[string]string{"pending": "queued", "running": "running", "done": "succeeded", "failed": "failed"}
+	for old := range legacy {
+		if _, err := s.Writer.Exec(`INSERT INTO jobs (id, kind, status, payload, result, error, started_at, finished_at, created_at, updated_at)
+			VALUES (?, 'suggest', ?, '{"n":1}', '{"r":2}', 'boom', 's', 'f', 'c', 'u')`, "job-"+old, old); err != nil {
+			t.Fatalf("insert %s job: %v", old, err)
+		}
+	}
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+	for old, want := range legacy {
+		var kind, status, payload, result, errText, startedAt, finishedAt, createdAt, updatedAt string
+		if err := s.Reader.QueryRow(`SELECT kind, status, payload, result, error, started_at, finished_at, created_at, updated_at FROM jobs WHERE id = ?`, "job-"+old).
+			Scan(&kind, &status, &payload, &result, &errText, &startedAt, &finishedAt, &createdAt, &updatedAt); err != nil {
+			t.Fatalf("read %s job: %v", old, err)
+		}
+		if status != want {
+			t.Errorf("%s job status = %q, want %q", old, status, want)
+		}
+		got := []string{kind, payload, result, errText, startedAt, finishedAt, createdAt, updatedAt}
+		if wantCols := []string{"suggest", `{"n":1}`, `{"r":2}`, "boom", "s", "f", "c", "u"}; !slices.Equal(got, wantCols) {
+			t.Errorf("%s job columns = %v, want %v", old, got, wantCols)
+		}
+	}
+	if tableExists(t, s, "jobs_new") {
+		t.Error("jobs_new left behind")
+	}
+}
+
+// TestMigrateAIProviderPresetsKeepsRowsAndReferences upgrades a database
+// holding ai_settings and ai_runs rows, with suggestion_batches and
+// week_plans referencing the run, and checks 0004 carries every row over,
+// keeps the references enforced and accepts the new providers.
+func TestMigrateAIProviderPresetsKeepsRowsAndReferences(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	before := fstest.MapFS{}
+	for _, name := range []string{"0000_bootstrap.sql", "0001_init.sql", "0002_household_settings_updated_by.sql", "0003_jobs_status.sql"} {
+		body, err := fs.ReadFile(migrations.FS, name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		before[name] = &fstest.MapFile{Data: body}
+	}
+	if err := Migrate(ctx, s.Writer, before); err != nil {
+		t.Fatal(err)
+	}
+	for _, stmt := range []string{
+		`INSERT INTO ai_settings (id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at)
+			VALUES (1, 'anthropic', 'https://api.anthropic.com', 'claude', 0.7, 'sp', x'0102', 'abcd', 'v', 'c', 'u')`,
+		`INSERT INTO ai_runs (id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at)
+			VALUES ('run-1', 'suggest', '1', 'ollama', 'llama', 0.5, 'ok', 10, 20, 30, 'e', 'req', 'resp', 'c', 'u')`,
+		`INSERT INTO suggestion_batches (id, trigger, status, ai_run_id, created_at, updated_at)
+			VALUES ('batch-1', 'manual', 'done', 'run-1', 'c', 'u')`,
+		`INSERT INTO week_plans (id, week_start, status, ai_run_id, created_at, updated_at)
+			VALUES ('plan-1', '2026-10-04', 'draft', 'run-1', 'c', 'u')`,
+	} {
+		if _, err := s.Writer.Exec(stmt); err != nil {
+			t.Fatalf("seed: %v", err)
+		}
+	}
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+
+	var provider, baseURL, model, systemPrompt, last4, verifiedAt, createdAt, updatedAt string
+	var temperature float64
+	var keyCT []byte
+	if err := s.Reader.QueryRow(`SELECT provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at FROM ai_settings WHERE id = 1`).
+		Scan(&provider, &baseURL, &model, &temperature, &systemPrompt, &keyCT, &last4, &verifiedAt, &createdAt, &updatedAt); err != nil {
+		t.Fatalf("read ai_settings: %v", err)
+	}
+	settings := []any{provider, baseURL, model, temperature, systemPrompt, string(keyCT), last4, verifiedAt, createdAt, updatedAt}
+	if want := []any{"anthropic", "https://api.anthropic.com", "claude", 0.7, "sp", "\x01\x02", "abcd", "v", "c", "u"}; !slices.Equal(settings, want) {
+		t.Errorf("ai_settings = %v, want %v", settings, want)
+	}
+
+	var skill, skillVersion, status, errText, request, response string
+	var latency, tokensIn, tokensOut int
+	if err := s.Reader.QueryRow(`SELECT skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at FROM ai_runs WHERE id = 'run-1'`).
+		Scan(&skill, &skillVersion, &provider, &model, &temperature, &status, &latency, &tokensIn, &tokensOut, &errText, &request, &response, &createdAt, &updatedAt); err != nil {
+		t.Fatalf("read ai_runs: %v", err)
+	}
+	run := []any{skill, skillVersion, provider, model, temperature, status, latency, tokensIn, tokensOut, errText, request, response, createdAt, updatedAt}
+	if want := []any{"suggest", "1", "ollama", "llama", 0.5, "ok", 10, 20, 30, "e", "req", "resp", "c", "u"}; !slices.Equal(run, want) {
+		t.Errorf("ai_runs = %v, want %v", run, want)
+	}
+
+	rows, err := s.Reader.Query("PRAGMA foreign_key_check")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if rows.Next() {
+		t.Error("foreign_key_check reported violations after 0004")
+	}
+	if err := rows.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.Writer.Exec(`DELETE FROM ai_runs WHERE id = 'run-1'`); err == nil || !strings.Contains(err.Error(), "FOREIGN KEY constraint failed") {
+		t.Errorf("deleting a referenced ai_run: error %v, want FOREIGN KEY constraint failure", err)
+	}
+
+	if _, err := s.Writer.Exec(`UPDATE ai_settings SET provider = 'openrouter' WHERE id = 1`); err != nil {
+		t.Errorf("ai_settings.provider openrouter rejected: %v", err)
+	}
+	if _, err := s.Writer.Exec(`UPDATE ai_runs SET provider = 'openai' WHERE id = 'run-1'`); err != nil {
+		t.Errorf("ai_runs.provider openai rejected: %v", err)
+	}
+	for _, table := range []string{"ai_settings_copy", "ai_runs_copy"} {
+		if tableExists(t, s, table) {
+			t.Errorf("%s left behind", table)
+		}
+	}
+}
+
+// TestMigrateAIProviderXAIKeepsRowsAndReferences upgrades a database at 0004
+// holding ai_settings and ai_runs rows with 0004's providers, with
+// suggestion_batches and week_plans referencing the run, and checks 0005
+// carries every row over, keeps the references enforced, accepts xai and
+// still rejects an unknown provider.
+func TestMigrateAIProviderXAIKeepsRowsAndReferences(t *testing.T) {
+	ctx := context.Background()
+	s := openTestStore(t)
+	before := fstest.MapFS{}
+	for _, name := range []string{"0000_bootstrap.sql", "0001_init.sql", "0002_household_settings_updated_by.sql", "0003_jobs_status.sql", "0004_ai_provider_presets.sql"} {
+		body, err := fs.ReadFile(migrations.FS, name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		before[name] = &fstest.MapFile{Data: body}
+	}
+	if err := Migrate(ctx, s.Writer, before); err != nil {
+		t.Fatal(err)
+	}
+	for _, stmt := range []string{
+		`INSERT INTO ai_settings (id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at)
+			VALUES (1, 'openrouter', 'https://openrouter.ai/api/v1', 'openai/gpt-4o', 0.7, 'sp', x'0102', 'abcd', 'v', 'c', 'u')`,
+		`INSERT INTO ai_runs (id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at)
+			VALUES ('run-1', 'suggest', '1', 'openai', 'gpt-4o', 0.5, 'ok', 10, 20, 30, 'e', 'req', 'resp', 'c', 'u')`,
+		`INSERT INTO suggestion_batches (id, trigger, status, ai_run_id, created_at, updated_at)
+			VALUES ('batch-1', 'manual', 'done', 'run-1', 'c', 'u')`,
+		`INSERT INTO week_plans (id, week_start, status, ai_run_id, created_at, updated_at)
+			VALUES ('plan-1', '2026-10-04', 'draft', 'run-1', 'c', 'u')`,
+	} {
+		if _, err := s.Writer.Exec(stmt); err != nil {
+			t.Fatalf("seed: %v", err)
+		}
+	}
+
+	if err := Migrate(ctx, s.Writer, migrations.FS); err != nil {
+		t.Fatal(err)
+	}
+
+	var provider, baseURL, model, systemPrompt, last4, verifiedAt, createdAt, updatedAt string
+	var temperature float64
+	var keyCT []byte
+	if err := s.Reader.QueryRow(`SELECT provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at FROM ai_settings WHERE id = 1`).
+		Scan(&provider, &baseURL, &model, &temperature, &systemPrompt, &keyCT, &last4, &verifiedAt, &createdAt, &updatedAt); err != nil {
+		t.Fatalf("read ai_settings: %v", err)
+	}
+	settings := []any{provider, baseURL, model, temperature, systemPrompt, string(keyCT), last4, verifiedAt, createdAt, updatedAt}
+	if want := []any{"openrouter", "https://openrouter.ai/api/v1", "openai/gpt-4o", 0.7, "sp", "\x01\x02", "abcd", "v", "c", "u"}; !slices.Equal(settings, want) {
+		t.Errorf("ai_settings = %v, want %v", settings, want)
+	}
+
+	var skill, skillVersion, status, errText, request, response string
+	var latency, tokensIn, tokensOut int
+	if err := s.Reader.QueryRow(`SELECT skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at FROM ai_runs WHERE id = 'run-1'`).
+		Scan(&skill, &skillVersion, &provider, &model, &temperature, &status, &latency, &tokensIn, &tokensOut, &errText, &request, &response, &createdAt, &updatedAt); err != nil {
+		t.Fatalf("read ai_runs: %v", err)
+	}
+	run := []any{skill, skillVersion, provider, model, temperature, status, latency, tokensIn, tokensOut, errText, request, response, createdAt, updatedAt}
+	if want := []any{"suggest", "1", "openai", "gpt-4o", 0.5, "ok", 10, 20, 30, "e", "req", "resp", "c", "u"}; !slices.Equal(run, want) {
+		t.Errorf("ai_runs = %v, want %v", run, want)
+	}
+
+	rows, err := s.Reader.Query("PRAGMA foreign_key_check")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if rows.Next() {
+		t.Error("foreign_key_check reported violations after 0005")
+	}
+	if err := rows.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.Writer.Exec(`DELETE FROM ai_runs WHERE id = 'run-1'`); err == nil || !strings.Contains(err.Error(), "FOREIGN KEY constraint failed") {
+		t.Errorf("deleting a referenced ai_run: error %v, want FOREIGN KEY constraint failure", err)
+	}
+
+	for _, table := range []string{"ai_settings", "ai_runs"} {
+		if _, err := s.Writer.Exec(`UPDATE ` + table + ` SET provider = 'xai'`); err != nil {
+			t.Errorf("%s.provider xai rejected: %v", table, err)
+		}
+		if _, err := s.Writer.Exec(`UPDATE ` + table + ` SET provider = 'grok'`); err == nil || !strings.Contains(err.Error(), "CHECK constraint failed") {
+			t.Errorf("%s.provider grok: error %v, want CHECK constraint failure", table, err)
+		}
+	}
+	for _, table := range []string{"ai_settings_copy", "ai_runs_copy"} {
+		if tableExists(t, s, table) {
+			t.Errorf("%s left behind", table)
+		}
+	}
+}

internal/store/schema_test.go

@@ -165,7 +165,7 @@ func testRow(table string, i int) map[string]any {
 		r["attempts"] = 0
 	case "jobs":
 		r["kind"] = "suggest"
-		r["status"] = "pending"
+		r["status"] = "queued"
 		r["payload"] = "{}"
 	case "schedule_runs":
 		r["schedule"] = "plan_draft"
@@ -305,7 +305,7 @@ func TestSchemaEnumChecksRejectInvalidValues(t *testing.T) {
 		{"household_settings", "plan_draft_dow", 5.5},
 		{"household_settings", "suggestions_dow", 0.5},
 		{"household_settings", "chat_autosend_dow", 3.5},
-		{"ai_runs", "provider", "openai"},
+		{"ai_runs", "provider", "gemini"},
 		{"ai_runs", "status", "done"},
 		{"dinners", "status", "deck"},
 		{"dinners", "origin", "ai"},
@@ -322,7 +322,7 @@ func TestSchemaEnumChecksRejectInvalidValues(t *testing.T) {
 		{"rotation_reviews", "decision", "promote"},
 		{"shopping_lists", "status", "frozen"},
 		{"shopping_items", "needed", 2},
-		{"ai_settings", "provider", "openai"},
+		{"ai_settings", "provider", "gemini"},
 		{"recipe_search_settings", "provider", "google"},
 		{"chat_settings", "last_test_status", "pending"},
 		{"notification_prefs", "event", "weekly_digest"},
@@ -330,7 +330,7 @@ func TestSchemaEnumChecksRejectInvalidValues(t *testing.T) {
 		{"notification_prefs", "chat", 2},
 		{"notification_outbox", "channel", "email"},
 		{"notification_outbox", "status", "queued"},
-		{"jobs", "status", "queued"},
+		{"jobs", "status", "bogus"},
 		{"schedule_runs", "schedule", "hourly"},
 	}
 	s := seededStore(t)
@@ -360,6 +360,23 @@ func TestSchemaRotationReviewEventAllowed(t *testing.T) {
 	}
 }
 
+// TestSchemaAIProvidersAllowed checks every provider preset can be stored in
+// both ai_settings and ai_runs.
+func TestSchemaAIProvidersAllowed(t *testing.T) {
+	s := seededStore(t)
+	for _, provider := range []string{"openai_compatible", "anthropic", "ollama", "openai", "openrouter", "xai"} {
+		for _, table := range []string{"ai_settings", "ai_runs"} {
+			inRolledBackTx(t, s, func(tx *sql.Tx) {
+				row := testRow(table, 1)
+				row["provider"] = provider
+				if err := insertSchemaRow(tx, table, row); err != nil {
+					t.Errorf("%s.provider %s rejected: %v", table, provider, err)
+				}
+			})
+		}
+	}
+}
+
 func TestSchemaDinnerStatuses(t *testing.T) {
 	s := seededStore(t)
 	for _, status := range []string{"suggested", "quest_log", "tried", "regular", "archived"} {

migrations/0003_jobs_status.sql

@@ -0,0 +1,32 @@
+-- 0003_jobs_status: jobs.status becomes queued, running, succeeded, failed,
+-- the states the job runner (internal/jobs) reports. SQLite cannot change a
+-- CHECK in place, so the table is rebuilt: create the new table, copy every
+-- row, drop the old one and rename. Nothing references jobs and it has no
+-- indexes or triggers, so the rebuild touches no other schema object. Rows
+-- written under the 0001 values are mapped (pending -> queued,
+-- done -> succeeded) so the copy cannot fail on an existing database.
+
+CREATE TABLE jobs_new (
+	id          TEXT NOT NULL PRIMARY KEY,
+	kind        TEXT NOT NULL,
+	status      TEXT NOT NULL CHECK (status IN ('queued', 'running', 'succeeded', 'failed')),
+	payload     TEXT NOT NULL, -- JSON
+	result      TEXT,          -- JSON, written progressively
+	error       TEXT,
+	started_at  TEXT,
+	finished_at TEXT,
+	created_at  TEXT NOT NULL,
+	updated_at  TEXT NOT NULL
+);
+
+INSERT INTO jobs_new (id, kind, status, payload, result, error, started_at, finished_at, created_at, updated_at)
+SELECT
+	id,
+	kind,
+	CASE status WHEN 'pending' THEN 'queued' WHEN 'done' THEN 'succeeded' ELSE status END,
+	payload, result, error, started_at, finished_at, created_at, updated_at
+FROM jobs;
+
+DROP TABLE jobs;
+
+ALTER TABLE jobs_new RENAME TO jobs;

migrations/0004_ai_provider_presets.sql

@@ -0,0 +1,68 @@
+-- 0004_ai_provider_presets: ai_settings.provider and ai_runs.provider become
+-- openai_compatible, anthropic, ollama, openai, openrouter, the presets in
+-- internal/ai/llm/presets. Every 0001 value is kept, so existing rows copy
+-- unchanged. SQLite cannot change a CHECK in place, so both tables are
+-- rebuilt: copy the rows aside, drop the table, create it again with the
+-- wider CHECK, copy the rows back and drop the copy. Neither table has
+-- indexes or triggers.
+--
+-- suggestion_batches.ai_run_id and week_plans.ai_run_id reference ai_runs,
+-- so the rebuild cannot use 0003's create-new-then-rename: dropping ai_runs
+-- counts every referencing row as a foreign key violation, and only inserting
+-- the matching ai_runs rows under the name ai_runs clears them. Deferring
+-- foreign keys holds the check until commit, after the rows are back. The
+-- pragma lasts only for this migration's transaction.
+
+PRAGMA defer_foreign_keys = ON;
+
+CREATE TABLE ai_settings_copy AS SELECT * FROM ai_settings;
+
+DROP TABLE ai_settings;
+
+CREATE TABLE ai_settings (
+	id              INTEGER PRIMARY KEY CHECK (id = 1),
+	provider        TEXT    NOT NULL CHECK (provider IN ('openai_compatible', 'anthropic', 'ollama', 'openai', 'openrouter')),
+	base_url        TEXT    NOT NULL,
+	model           TEXT    NOT NULL,
+	temperature     REAL    NOT NULL,
+	system_prompt   TEXT,
+	api_key_ct      BLOB,
+	api_key_last4   TEXT,
+	key_verified_at TEXT,
+	created_at      TEXT    NOT NULL,
+	updated_at      TEXT    NOT NULL
+);
+
+INSERT INTO ai_settings (id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at)
+SELECT id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at
+FROM ai_settings_copy;
+
+DROP TABLE ai_settings_copy;
+
+CREATE TABLE ai_runs_copy AS SELECT * FROM ai_runs;
+
+DROP TABLE ai_runs;
+
+CREATE TABLE ai_runs (
+	id                 TEXT    NOT NULL PRIMARY KEY,
+	skill              TEXT    NOT NULL,
+	skill_version      TEXT    NOT NULL,
+	provider           TEXT    NOT NULL CHECK (provider IN ('openai_compatible', 'anthropic', 'ollama', 'openai', 'openrouter')),
+	model              TEXT    NOT NULL,
+	temperature        REAL    NOT NULL,
+	status             TEXT    NOT NULL CHECK (status IN ('running', 'ok', 'error')),
+	latency_ms         INTEGER,
+	tokens_in          INTEGER,
+	tokens_out         INTEGER,
+	error              TEXT,
+	request_redacted   TEXT    NOT NULL,
+	response_redacted  TEXT,
+	created_at         TEXT    NOT NULL,
+	updated_at         TEXT    NOT NULL
+);
+
+INSERT INTO ai_runs (id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at)
+SELECT id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at
+FROM ai_runs_copy;
+
+DROP TABLE ai_runs_copy;

migrations/0005_ai_provider_xai.sql

@@ -0,0 +1,64 @@
+-- 0005_ai_provider_xai: ai_settings.provider and ai_runs.provider also
+-- accept xai, the xAI Grok preset in internal/ai/llm/presets. Every 0004
+-- value is kept, so existing rows copy unchanged. The rebuild is 0004's:
+-- copy the rows aside, drop the table, create it again with the wider CHECK,
+-- copy the rows back and drop the copy. Neither table has indexes or
+-- triggers.
+--
+-- suggestion_batches.ai_run_id and week_plans.ai_run_id reference ai_runs,
+-- so foreign keys are deferred until commit, after the ai_runs rows are
+-- back. The pragma lasts only for this migration's transaction.
+
+PRAGMA defer_foreign_keys = ON;
+
+CREATE TABLE ai_settings_copy AS SELECT * FROM ai_settings;
+
+DROP TABLE ai_settings;
+
+CREATE TABLE ai_settings (
+	id              INTEGER PRIMARY KEY CHECK (id = 1),
+	provider        TEXT    NOT NULL CHECK (provider IN ('openai_compatible', 'anthropic', 'ollama', 'openai', 'openrouter', 'xai')),
+	base_url        TEXT    NOT NULL,
+	model           TEXT    NOT NULL,
+	temperature     REAL    NOT NULL,
+	system_prompt   TEXT,
+	api_key_ct      BLOB,
+	api_key_last4   TEXT,
+	key_verified_at TEXT,
+	created_at      TEXT    NOT NULL,
+	updated_at      TEXT    NOT NULL
+);
+
+INSERT INTO ai_settings (id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at)
+SELECT id, provider, base_url, model, temperature, system_prompt, api_key_ct, api_key_last4, key_verified_at, created_at, updated_at
+FROM ai_settings_copy;
+
+DROP TABLE ai_settings_copy;
+
+CREATE TABLE ai_runs_copy AS SELECT * FROM ai_runs;
+
+DROP TABLE ai_runs;
+
+CREATE TABLE ai_runs (
+	id                 TEXT    NOT NULL PRIMARY KEY,
+	skill              TEXT    NOT NULL,
+	skill_version      TEXT    NOT NULL,
+	provider           TEXT    NOT NULL CHECK (provider IN ('openai_compatible', 'anthropic', 'ollama', 'openai', 'openrouter', 'xai')),
+	model              TEXT    NOT NULL,
+	temperature        REAL    NOT NULL,
+	status             TEXT    NOT NULL CHECK (status IN ('running', 'ok', 'error')),
+	latency_ms         INTEGER,
+	tokens_in          INTEGER,
+	tokens_out         INTEGER,
+	error              TEXT,
+	request_redacted   TEXT    NOT NULL,
+	response_redacted  TEXT,
+	created_at         TEXT    NOT NULL,
+	updated_at         TEXT    NOT NULL
+);
+
+INSERT INTO ai_runs (id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at)
+SELECT id, skill, skill_version, provider, model, temperature, status, latency_ms, tokens_in, tokens_out, error, request_redacted, response_redacted, created_at, updated_at
+FROM ai_runs_copy;
+
+DROP TABLE ai_runs_copy;

migrations/queries/jobs.sql

@@ -0,0 +1,37 @@
+-- name: CreateJob :exec
+INSERT INTO jobs (id, kind, status, payload, created_at, updated_at)
+VALUES (?, ?, 'queued', ?, ?, ?);
+
+-- name: ClaimNextJob :one
+-- Marks the oldest queued job running and returns it. Returns sql.ErrNoRows
+-- when no job is queued.
+UPDATE jobs
+SET status = 'running', started_at = sqlc.arg(now), updated_at = sqlc.arg(now)
+WHERE id = (SELECT id FROM jobs WHERE status = 'queued' ORDER BY id LIMIT 1)
+RETURNING *;
+
+-- name: PublishJobResult :execrows
+-- Stores a partial result of a running job.
+UPDATE jobs
+SET result = ?, updated_at = ?
+WHERE id = ? AND status = 'running';
+
+-- name: SucceedJob :execrows
+UPDATE jobs
+SET status = 'succeeded', result = sqlc.arg(result), finished_at = sqlc.arg(now), updated_at = sqlc.arg(now)
+WHERE id = sqlc.arg(id) AND status = 'running';
+
+-- name: FailJob :execrows
+UPDATE jobs
+SET status = 'failed', error = sqlc.arg(error), finished_at = sqlc.arg(now), updated_at = sqlc.arg(now)
+WHERE id = sqlc.arg(id) AND status = 'running';
+
+-- name: FailRunningJobs :execrows
+-- Fails every job left running, at boot before any worker starts.
+UPDATE jobs
+SET status = 'failed', error = sqlc.arg(error), finished_at = sqlc.arg(now), updated_at = sqlc.arg(now)
+WHERE status = 'running';
+
+-- name: GetJob :one
+SELECT * FROM jobs
+WHERE id = ?;