fix(db): stop billing cache writes twice in profile cost

Norma normalizes InputTokens to input + cache read + cache write, so both cache buckets are subsets of it. The fresh share billed at the input price is now input minus reads minus writes, still clamped at zero for gateways that report disjoint buckets.

agent/chat.go

@@ -169,9 +169,12 @@ func (c *ChatAgent) Chat(ctx context.Context, agentKey, sessionID, message strin
 	if c.guard != nil {
 		opts.Hooks = c.guard.Hooks()
 	}
+	// The session id is the provider-side identity (session header, usage metering)
+	// with or without persistence; Norma only puts it on ctx when it writes a transcript.
+	opts.SessionID = sessionID
+	ctx = transcript.WithSessionID(ctx, opts.SessionID)
 	if c.tx != nil { // persist raw human↔AI conversation; one accumulating file per thread
 		opts.Transcript = c.tx
-		opts.SessionID = sessionID
 	}
 	// experimental feature: when enabled, noa takes over context compression (archive centralized under <workDir>/noa/<SessionID>, persistent).
 	enableNoa(&opts, c.noaEnabledFn, c.workDir, "chat-"+sessionID, noaWarn("chat-"+sessionID))
@@ -180,8 +183,11 @@ func (c *ChatAgent) Chat(ctx context.Context, agentKey, sessionID, message strin
 	defer s.Close()
 	// reload prior conversation so the agent has context across turns (each Chat is
 	// a fresh session). First turn: no file yet → Resume loads nothing and proceeds.
+	// A corrupt or unreadable transcript stops the turn before any model or tool call.
 	if c.tx != nil {
-		_ = s.Resume(sessionID)
+		if err := resumeSession(s, opts.SessionID); err != nil {
+			return "", err
+		}
 	}
 	// re-unlock skill-gated MCPs from prior Skill() calls in the reloaded history so
 	// revealed tools stay callable across the fresh session.

agent/mainagent.go

@@ -169,14 +169,17 @@ func (m *MainAgent) Chat(ctx context.Context, taskID int64, mainSeg int, as *db.
 	if hooks != nil { // typed-nil guard: only set when concrete (avoids harness panic)
 		opts.Hooks = hooks
 	}
+	// Segment 0 keeps the legacy "exp%d-main" name so existing transcripts still
+	// load; each new session (seg>=1) gets its own file for a clean context. The id
+	// is the provider-side identity (session header, usage metering) with or without
+	// persistence; Norma only puts it on ctx when it writes a transcript.
+	opts.SessionID = fmt.Sprintf("exp%d-main", ts.ID())
+	if mainSeg > 0 {
+		opts.SessionID = fmt.Sprintf("exp%d-main-s%d", ts.ID(), mainSeg)
+	}
+	ctx = transcript.WithSessionID(ctx, opts.SessionID)
 	if m.tx != nil { // persist raw human↔AI conversation; one accumulating file per segment
 		opts.Transcript = m.tx
-		// Segment 0 keeps the legacy "exp%d-main" name so existing transcripts still
-		// load; each new session (seg>=1) gets its own file for a clean context.
-		opts.SessionID = fmt.Sprintf("exp%d-main", ts.ID())
-		if mainSeg > 0 {
-			opts.SessionID = fmt.Sprintf("exp%d-main-s%d", ts.ID(), mainSeg)
-		}
 	}
 	// experimental feature: when enabled, noa takes over context compression (archive centralized under <workDir>/noa/<SessionID>, persistent).
 	// the session id follows the same rule as the transcript (segment-aware), keeping archive and resume aligned.
@@ -191,8 +194,11 @@ func (m *MainAgent) Chat(ctx context.Context, taskID int64, mainSeg int, as *db.
 	// reload the prior conversation from the transcript so the agent has context
 	// across turns (each Chat is a fresh session; without this it can't see earlier
 	// messages). First turn: no file yet → Resume loads nothing and proceeds.
+	// A corrupt or unreadable transcript stops the turn before any model or tool call.
 	if m.tx != nil {
-		_ = s.Resume(opts.SessionID)
+		if err := resumeSession(s, opts.SessionID); err != nil {
+			return "", err
+		}
 	}
 	// C2: this session is fresh each turn; re-unlock skill-gated MCPs from prior
 	// Skill() calls in the reloaded history so revealed tools stay callable.

agent/planner.go

@@ -567,9 +567,12 @@ func (p *Planner) Plan(ctx context.Context, taskID int64, as *db.AssetStore, ts
 	if hooks != nil { // typed-nil guard: only set when concrete (avoids harness panic)
 		opts.Hooks = hooks
 	}
+	// The session id is the provider-side identity (session header, usage metering)
+	// with or without persistence; Norma only puts it on ctx when it writes a transcript.
+	opts.SessionID = fmt.Sprintf("exp%d-planner", ts.ID())
+	ctx = transcript.WithSessionID(ctx, opts.SessionID)
 	if p.tx != nil { // persist raw LLM conversation; one accumulating file per task's planner
 		opts.Transcript = p.tx
-		opts.SessionID = fmt.Sprintf("exp%d-planner", ts.ID())
 	}
 	// Experimental: when on, noa takes over context compression (archives persist under <workDir>/noa/<SessionID>).
 	noaSession := fmt.Sprintf("exp%d-planner", ts.ID())

agent/session.go

@@ -0,0 +1,19 @@
+package agent
+
+import (
+	"fmt"
+
+	"github.com/Autumn-27/norma/agentcore"
+)
+
+// resumeSession reloads the persisted conversation of session id into s. Norma's
+// transcript.Store.Load treats a missing file as a fresh session (no records, no
+// error); any other failure, such as a corrupt line or an unreadable path, is
+// returned so the caller stops before the first model or tool call instead of
+// appending a new conversation to the damaged file.
+func resumeSession(s *agentcore.Session, id string) error {
+	if err := s.Resume(id); err != nil {
+		return fmt.Errorf("restore Norma session %q: %w", id, err)
+	}
+	return nil
+}

agent/session_test.go

@@ -0,0 +1,305 @@
+package agent
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"iter"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/Autumn-27/artex/db"
+	"github.com/Autumn-27/norma/llm"
+	"github.com/Autumn-27/norma/transcript"
+)
+
+// sessionProbe is a provider that answers every call with one text turn and
+// records the session id it saw on ctx plus the request messages.
+type sessionProbe struct {
+	mu   sync.Mutex
+	ids  []string
+	msgs [][]llm.Message
+}
+
+func (p *sessionProbe) Stream(ctx context.Context, req llm.CompletionRequest) iter.Seq2[llm.StreamEvent, error] {
+	p.mu.Lock()
+	p.ids = append(p.ids, transcript.SessionIDFrom(ctx))
+	p.msgs = append(p.msgs, req.Messages)
+	p.mu.Unlock()
+	return func(yield func(llm.StreamEvent, error) bool) {
+		if yield(llm.StreamEvent{Type: llm.SETextDelta, Text: "done"}, nil) {
+			yield(llm.StreamEvent{Type: llm.SEMessageDelta, StopReason: "end_turn"}, nil)
+		}
+	}
+}
+
+func (p *sessionProbe) Complete(ctx context.Context, req llm.CompletionRequest) (llm.Message, string, llm.Usage, error) {
+	acc := llm.NewAccumulator()
+	for ev, err := range p.Stream(ctx, req) {
+		if err != nil {
+			return llm.Message{}, "", llm.Usage{}, err
+		}
+		acc.Add(ev)
+	}
+	return acc.Message(), acc.StopReason, acc.Usage, nil
+}
+
+func (p *sessionProbe) seen() []string {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	return append([]string(nil), p.ids...)
+}
+
+// jsonlFiles lists every .jsonl file under dir.
+func jsonlFiles(t *testing.T, dir string) []string {
+	t.Helper()
+	var out []string
+	err := filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if !d.IsDir() && strings.HasSuffix(path, ".jsonl") {
+			out = append(out, path)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return out
+}
+
+// damageTranscript makes the main transcript of id corrupt (a non-JSON line) or
+// unreadable (a directory). It returns the bytes a corrupt file must keep.
+func damageTranscript(t *testing.T, store *transcript.Store, id string, unreadable bool) string {
+	t.Helper()
+	path := store.MainPath(id)
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if unreadable {
+		if err := os.Mkdir(path, 0o700); err != nil {
+			t.Fatal(err)
+		}
+		return ""
+	}
+	const original = "{corrupt transcript\n"
+	if err := os.WriteFile(path, []byte(original), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	return original
+}
+
+// assertTranscriptUntouched checks that a damaged transcript was neither
+// rewritten nor appended to.
+func assertTranscriptUntouched(t *testing.T, store *transcript.Store, id, original string, unreadable bool) {
+	t.Helper()
+	path := store.MainPath(id)
+	if unreadable {
+		entries, err := os.ReadDir(path)
+		if err != nil || len(entries) != 0 {
+			t.Fatalf("unreadable transcript changed: entries=%v err=%v", entries, err)
+		}
+		return
+	}
+	b, err := os.ReadFile(path)
+	if err != nil || string(b) != original {
+		t.Fatalf("damaged transcript changed: %q err=%v", b, err)
+	}
+}
+
+func assertRestoreError(t *testing.T, err error, calls int) {
+	t.Helper()
+	if err == nil || !strings.Contains(err.Error(), "restore Norma session") || calls != 0 {
+		t.Fatalf("err=%v provider calls=%d", err, calls)
+	}
+}
+
+var damageCases = []struct {
+	name       string
+	unreadable bool
+}{{"corrupt", false}, {"unreadable-directory", true}}
+
+func TestChatSessionIdentityWithoutTranscript(t *testing.T) {
+	p := &sessionProbe{}
+	workDir := t.TempDir()
+	c := NewChatAgent(p, "test-model", workDir, nil, 100000)
+	for range 2 {
+		if _, err := c.Chat(t.Context(), "assistant", "conv-stable", "hello", 1, 0, false, nil); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if ids := p.seen(); len(ids) != 2 || ids[0] != "conv-stable" || ids[1] != "conv-stable" {
+		t.Fatalf("provider session ids: %v", ids)
+	}
+	if files := jsonlFiles(t, workDir); len(files) != 0 {
+		t.Fatalf("transcript written without persistence: %v", files)
+	}
+}
+
+func TestChatMissingTranscriptStartsFresh(t *testing.T) {
+	store := transcript.NewStore(t.TempDir())
+	p := &sessionProbe{}
+	c := NewChatAgent(p, "test-model", t.TempDir(), store, 100000)
+	if _, err := c.Chat(t.Context(), "assistant", "conv-new", "hello", 1, 0, false, nil); err != nil {
+		t.Fatal(err)
+	}
+	if ids := p.seen(); len(ids) != 1 || ids[0] != "conv-new" {
+		t.Fatalf("provider session ids: %v", ids)
+	}
+	recs, err := store.Load(store.MainPath("conv-new"))
+	if err != nil || len(recs) == 0 {
+		t.Fatalf("fresh transcript not written: %d records, err=%v", len(recs), err)
+	}
+}
+
+func TestChatRefusesDamagedTranscript(t *testing.T) {
+	for _, tc := range damageCases {
+		t.Run(tc.name, func(t *testing.T) {
+			store := transcript.NewStore(t.TempDir())
+			original := damageTranscript(t, store, "conv-broken", tc.unreadable)
+			p := &sessionProbe{}
+			c := NewChatAgent(p, "test-model", t.TempDir(), store, 100000)
+			_, err := c.Chat(t.Context(), "assistant", "conv-broken", "hello", 1, 0, false, nil)
+			assertRestoreError(t, err, len(p.seen()))
+			assertTranscriptUntouched(t, store, "conv-broken", original, tc.unreadable)
+		})
+	}
+}
+
+func TestChatResumesSignedThinkingHistory(t *testing.T) {
+	store := transcript.NewStore(t.TempDir())
+	w := store.NewWriter("conv-signed", "")
+	w.RecordMessage(llm.UserText("earlier question"), llm.Usage{})
+	w.RecordMessage(llm.Message{Role: llm.RoleAssistant, Content: []llm.ContentBlock{
+		{Type: llm.BlockThinking, Thinking: "reasoning", Signature: "signed"},
+		{Type: llm.BlockRedactedThinking, Data: "opaque"},
+		{Type: llm.BlockText, Text: "earlier answer"},
+	}}, llm.Usage{})
+	if err := w.Err(); err != nil {
+		t.Fatal(err)
+	}
+	p := &sessionProbe{}
+	c := NewChatAgent(p, "test-model", t.TempDir(), store, 100000)
+	if _, err := c.Chat(t.Context(), "assistant", "conv-signed", "next question", 1, 0, false, nil); err != nil {
+		t.Fatal(err)
+	}
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	if len(p.msgs) != 1 {
+		t.Fatalf("provider calls: %d", len(p.msgs))
+	}
+	var thinking, redacted bool
+	for _, m := range p.msgs[0] {
+		for _, b := range m.Content {
+			thinking = thinking || (b.Type == llm.BlockThinking && b.Thinking == "reasoning" && b.Signature == "signed")
+			redacted = redacted || (b.Type == llm.BlockRedactedThinking && b.Data == "opaque")
+		}
+	}
+	if !thinking || !redacted {
+		t.Fatalf("resumed history lost signed thinking=%v redacted=%v: %+v", thinking, redacted, p.msgs[0])
+	}
+}
+
+// sessionFixture is one exploration with one intent on the test database.
+type sessionFixture struct {
+	expID    int64
+	intentID int64
+	ts       *db.ExplorationStore
+	intent   *db.Node
+}
+
+func newSessionFixture(t *testing.T) sessionFixture {
+	t.Helper()
+	d := testDB(t)
+	t.Cleanup(func() { _ = d.Close() })
+	expID, err := d.CreateExploration("session identity probe", "keep the session id stable")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _, _ = d.Exec(`DELETE FROM explorations WHERE id=$1`, expID) })
+	ts := d.Exploration(expID)
+	payload := map[string]any{"summary": "session probe"}
+	intentID, err := ts.AddNode("intent", payload, 0, "running", "planner", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	raw, _ := json.Marshal(payload)
+	return sessionFixture{expID: expID, intentID: intentID, ts: ts, intent: &db.Node{ID: intentID, Payload: raw}}
+}
+
+// run drives one agent kind once and returns the session id it should use.
+func (f sessionFixture) run(t *testing.T, kind string, p *sessionProbe, tx *transcript.Store) (string, error) {
+	t.Helper()
+	workDir := t.TempDir()
+	switch kind {
+	case "worker":
+		_, _, err := NewWorker(p, "test-model", workDir, tx, 0, 3).Execute(t.Context(), "work#1", f.expID, nil, f.ts, f.intent, passHooks{}, nil, nil, nil)
+		return WorkerSessionID(f.expID, f.intentID), err
+	case "planner":
+		_, _, err := NewPlanner(p, "test-model", workDir, tx, 0, 3).Plan(t.Context(), f.expID, nil, f.ts, "probe goal", nil, passHooks{}, nil)
+		return fmt.Sprintf("exp%d-planner", f.expID), err
+	case "mainagent":
+		_, err := NewMainAgent(p, "test-model", workDir, tx, 0, 3).Chat(t.Context(), f.expID, 0, nil, f.ts, "probe goal", "status?", passHooks{}, nil, nil, nil, nil, nil)
+		return fmt.Sprintf("exp%d-main", f.expID), err
+	case "mainagent-seg":
+		_, err := NewMainAgent(p, "test-model", workDir, tx, 0, 3).Chat(t.Context(), f.expID, 2, nil, f.ts, "probe goal", "status?", passHooks{}, nil, nil, nil, nil, nil)
+		return fmt.Sprintf("exp%d-main-s2", f.expID), err
+	}
+	t.Fatalf("unknown agent kind %q", kind)
+	return "", nil
+}
+
+func TestAgentSessionIdentityWithAndWithoutTranscript(t *testing.T) {
+	f := newSessionFixture(t)
+	for _, kind := range []string{"worker", "planner", "mainagent", "mainagent-seg"} {
+		t.Run(kind, func(t *testing.T) {
+			bare := &sessionProbe{}
+			want, err := f.run(t, kind, bare, nil)
+			if err != nil {
+				t.Fatal(err)
+			}
+			store := transcript.NewStore(t.TempDir())
+			persisted := &sessionProbe{}
+			if _, err := f.run(t, kind, persisted, store); err != nil {
+				t.Fatal(err)
+			}
+			for _, ids := range [][]string{bare.seen(), persisted.seen()} {
+				if len(ids) == 0 {
+					t.Fatal("provider never called")
+				}
+				for _, id := range ids {
+					if id != want {
+						t.Fatalf("provider session ids %v, want %q", ids, want)
+					}
+				}
+			}
+			if recs, err := store.Load(store.MainPath(want)); err != nil || len(recs) == 0 {
+				t.Fatalf("transcript %q not written under the session id: %d records, err=%v", want, len(recs), err)
+			}
+		})
+	}
+}
+
+func TestAgentRefusesDamagedTranscript(t *testing.T) {
+	f := newSessionFixture(t)
+	for _, kind := range []string{"worker", "mainagent"} {
+		for _, tc := range damageCases {
+			t.Run(kind+"/"+tc.name, func(t *testing.T) {
+				store := transcript.NewStore(t.TempDir())
+				id := WorkerSessionID(f.expID, f.intentID)
+				if kind == "mainagent" {
+					id = fmt.Sprintf("exp%d-main", f.expID)
+				}
+				original := damageTranscript(t, store, id, tc.unreadable)
+				p := &sessionProbe{}
+				_, err := f.run(t, kind, p, store)
+				assertRestoreError(t, err, len(p.seen()))
+				assertTranscriptUntouched(t, store, id, original, tc.unreadable)
+			})
+		}
+	}
+}

agent/worker.go

@@ -540,9 +540,12 @@ func (w *Worker) execute(ctx context.Context, name string, taskID int64, as *db.
 	if hooks != nil { // typed-nil guard: only set when concrete (avoids harness panic)
 		opts.Hooks = hooks
 	}
+	// The session id is the provider-side identity (session header, usage metering)
+	// with or without persistence; Norma only puts it on ctx when it writes a transcript.
+	opts.SessionID = WorkerSessionID(ts.ID(), intent.ID)
+	ctx = transcript.WithSessionID(ctx, opts.SessionID)
 	if w.tx != nil { // persist raw LLM conversation; one file per worked intent
 		opts.Transcript = w.tx
-		opts.SessionID = WorkerSessionID(ts.ID(), intent.ID)
 	}
 	intentID := intent.ID
 	emitWrap := func(r db.Activity) {
@@ -574,7 +577,12 @@ func (w *Worker) execute(ctx context.Context, name string, taskID int64, as *db.
 	// restarting from scratch.
 	alreadyRecorded := false
 	if w.tx != nil {
-		_ = s.Resume(opts.SessionID)
+		// A corrupt or unreadable transcript stops the run before any model or tool
+		// call. No terminal reason: the engine marks the intent blocked without the
+		// model_error reruns, which would only fail the same way again.
+		if err := resumeSession(s, opts.SessionID); err != nil {
+			return "", tsx.Writes(), err
+		}
 		alreadyRecorded = requestID != "" && hasWorkerChatMessage(s.Messages(), requestID)
 		if len(s.Messages()) > 0 && message == "" {
 			seedUnlockFromHistory(s.Messages(), def.UnlockSkill)

db/llm_usage.go

@@ -341,11 +341,12 @@ func applyCostEur(d *DB, out []ProfileUsage) error {
 		if !ok || (pr.in == 0 && pr.outp == 0 && pr.cr == 0 && pr.cw == 0) {
 			continue
 		}
-		// InputTokens includes the cached subset (Anthropic and OpenAI usage
-		// semantics), so the fresh share is input minus cache reads; charging
-		// both buckets at full input price double-counts the cache. Clamped at
-		// zero for gateways that report the buckets disjointly.
-		fresh := out[i].InputTokens - out[i].CacheReadTokens
+		// InputTokens already includes both cached subsets: Norma normalizes it to
+		// input + cache read + cache write (OpenAI prompt_tokens semantics). The
+		// fresh share is therefore input minus cache reads minus cache writes;
+		// charging either subset at full input price as well bills it twice.
+		// Clamped at zero for gateways that report the buckets disjointly.
+		fresh := out[i].InputTokens - out[i].CacheReadTokens - out[i].CacheWriteTokens
 		if fresh < 0 {
 			fresh = 0
 		}

db/llm_usage_cost_test.go

@@ -0,0 +1,125 @@
+package db
+
+import (
+	"fmt"
+	"math"
+	"testing"
+	"time"
+)
+
+// costProfiles saves a priced profile (EUR per million tokens: input 2.00,
+// output 4.00, cache read 0.20, cache write 2.50) and an unpriced one.
+func costProfiles(t *testing.T, d *DB) (priced, unpriced string) {
+	t.Helper()
+	suffix := time.Now().UnixNano()
+	priced, unpriced = fmt.Sprintf("t-cost-priced-%d", suffix), fmt.Sprintf("t-cost-unpriced-%d", suffix)
+	for _, p := range []*LLMProfile{
+		{Name: priced, Format: "anthropic", Model: "m", APIKey: "k",
+			PriceInputPerM: 2, PriceOutputPerM: 4, PriceCacheReadPerM: 0.2, PriceCacheWritePerM: 2.5},
+		{Name: unpriced, Format: "anthropic", Model: "m", APIKey: "k"},
+	} {
+		id, err := d.SaveProfile(p)
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(func() { d.Exec(`DELETE FROM llm_profiles WHERE id=$1`, id) })
+	}
+	return priced, unpriced
+}
+
+func assertCost(t *testing.T, got *float64, want float64) {
+	t.Helper()
+	if got == nil {
+		t.Fatalf("cost=nil, want %.2f", want)
+	}
+	if math.Abs(*got-want) > 1e-9 {
+		t.Fatalf("cost=%.4f, want %.2f", *got, want)
+	}
+}
+
+// InputTokens already includes the cache read and cache write subsets, so only
+// the remainder is billed at the input price.
+func TestCostSeparatesFreshReadAndWriteBuckets(t *testing.T) {
+	d, err := Open(testDSN(t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer d.Close()
+	priced, unpriced := costProfiles(t, d)
+	// Every case adds 100k output tokens: 0.1 × 4.00 = 0.40.
+	for _, tc := range []struct {
+		name            string
+		in, read, write int
+		want            float64
+	}{
+		{"fresh", 1_000_000, 0, 0, 2.40},                          // 1M×2.00 + 0.40
+		{"read_only", 1_000_000, 1_000_000, 0, 0.60},              // 0 fresh + 1M×0.20 + 0.40
+		{"write_only", 1_000_000, 0, 1_000_000, 2.90},             // 0 fresh + 1M×2.50 + 0.40
+		{"mixed", 1_000_000, 200_000, 300_000, 2.19},              // 500k×2.00 + 200k×0.20 + 300k×2.50 + 0.40
+		{"inconsistent_gateway", 100_000, 200_000, 300_000, 1.19}, // fresh clamped to 0 + 0.04 + 0.75 + 0.40
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			out := []ProfileUsage{
+				{ProfileName: priced, InputTokens: tc.in, CacheReadTokens: tc.read, CacheWriteTokens: tc.write, OutputTokens: 100_000},
+				{ProfileName: unpriced, InputTokens: tc.in, CacheReadTokens: tc.read, CacheWriteTokens: tc.write, OutputTokens: 100_000},
+				{ProfileName: "t-cost-unknown-profile", InputTokens: tc.in, OutputTokens: 100_000},
+			}
+			if err := applyCostEur(d, out); err != nil {
+				t.Fatal(err)
+			}
+			assertCost(t, out[0].CostEur, tc.want)
+			if out[1].CostEur != nil || out[2].CostEur != nil {
+				t.Fatalf("unpriced usage got a cost: %v %v", out[1].CostEur, out[2].CostEur)
+			}
+		})
+	}
+}
+
+// Several ledger rows of one profile are summed before pricing; with no clamp
+// involved the profile cost equals the sum of the per-row costs.
+func TestUsageByProfileCostAggregatesRows(t *testing.T) {
+	d, err := Open(testDSN(t))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer d.Close()
+	priced, unpriced := costProfiles(t, d)
+	t.Cleanup(func() { d.Exec(`DELETE FROM llm_usage WHERE profile_name IN ($1,$2)`, priced, unpriced) })
+	rows := []LLMUsage{
+		// fresh 400k×2.00 + 200k×0.20 + 40k×4.00 = 0.80 + 0.04 + 0.16 = 1.00
+		{InputTokens: 600_000, CacheRead: 200_000, OutputTokens: 40_000},
+		// fresh 100k×2.00 + 300k×2.50 + 60k×4.00 = 0.20 + 0.75 + 0.24 = 1.19
+		{InputTokens: 400_000, CacheWrite: 300_000, OutputTokens: 60_000},
+	}
+	for _, profile := range []string{priced, unpriced} {
+		for _, r := range rows {
+			r.ProfileName, r.Model, r.Status = profile, "m", "ok"
+			if err := d.InsertLLMUsage(&r); err != nil {
+				t.Fatal(err)
+			}
+		}
+	}
+	usage, err := d.UsageByProfile()
+	if err != nil {
+		t.Fatal(err)
+	}
+	found := 0
+	for _, p := range usage {
+		switch p.ProfileName {
+		case priced:
+			found++
+			if p.Calls != 2 || p.InputTokens != 1_000_000 || p.CacheReadTokens != 200_000 || p.CacheWriteTokens != 300_000 || p.OutputTokens != 100_000 {
+				t.Fatalf("aggregate %+v", p)
+			}
+			assertCost(t, p.CostEur, 2.19) // = 1.00 + 1.19, the mixed case
+		case unpriced:
+			found++
+			if p.Calls != 2 || p.CostEur != nil {
+				t.Fatalf("unpriced aggregate %+v", p)
+			}
+		}
+	}
+	if found != 2 {
+		t.Fatalf("profiles missing from UsageByProfile: found %d of 2", found)
+	}
+}

llmrec/llmrec.go

@@ -195,11 +195,11 @@ func (r *Recorder) Stream(ctx context.Context, req llm.CompletionRequest) iter.S
 				return
 			}
 			// Always track usage (cheap); accumulate text/thinking only for bodies.
-			// Anthropic (and the other providers) split token usage across events:
-			// message_start carries ONLY the input side (input + cache), message_delta
-			// ONLY the output. They must be FOLDED with Add — overwriting on delta
-			// would zero out the input already counted at start (mirrors the SDK's own
-			// llm.Accumulator; see norma/llm/accumulate.go).
+			// message_start carries the input side (input + cache) and is added.
+			// Since Norma v0.4.7 message_delta also echoes that input side next to the
+			// output, so it is folded with llm.Usage.MergeEcho (max on echoed fields,
+			// sum on output), as llm.Accumulator does; Add would count the input and
+			// cache twice. An output-only delta folds the same either way.
 			switch ev.Type {
 			case llm.SETextDelta:
 				if recordBodies {
@@ -215,7 +215,7 @@ func (r *Recorder) Stream(ctx context.Context, req llm.CompletionRequest) iter.S
 				if ev.StopReason != "" {
 					stopReason = ev.StopReason
 				}
-				usage.Add(ev.Usage)
+				usage.MergeEcho(ev.Usage)
 			}
 			if !yield(ev, err) {
 				return

llmrec/usage_echo_test.go

@@ -0,0 +1,118 @@
+package llmrec
+
+import (
+	"context"
+	"iter"
+	"testing"
+
+	"github.com/Autumn-27/artex/db"
+	"github.com/Autumn-27/norma/llm"
+	"github.com/google/uuid"
+)
+
+// echoStreamProvider streams one message_start and one message_delta with the
+// given (already normalized) usage, as Norma's providers emit them.
+type echoStreamProvider struct {
+	completeProvider
+	start, delta llm.Usage
+}
+
+func (p echoStreamProvider) Stream(context.Context, llm.CompletionRequest) iter.Seq2[llm.StreamEvent, error] {
+	return func(yield func(llm.StreamEvent, error) bool) {
+		for _, ev := range []llm.StreamEvent{
+			{Type: llm.SEMessageStart, Usage: p.start},
+			{Type: llm.SETextDelta, Text: "answer"},
+			{Type: llm.SEMessageDelta, StopReason: "end_turn", Usage: p.delta},
+			{Type: llm.SEMessageStop},
+		} {
+			if !yield(ev, nil) {
+				return
+			}
+		}
+	}
+}
+
+// Norma normalizes Anthropic usage so InputTokens includes the cache read and
+// write subsets, and since v0.4.7 message_delta echoes that input side.
+var usageEchoCases = []struct {
+	name         string
+	start, delta llm.Usage
+	want         llm.Usage
+}{
+	{
+		name:  "full_echo",
+		start: llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3},
+		delta: llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3, OutputTokens: 5},
+		want:  llm.Usage{InputTokens: 23, OutputTokens: 5, CacheReadTokens: 5, CacheWriteTokens: 3},
+	},
+	{
+		// Raw start: input 500, cache read 200, cache creation 40 → normalized 740.
+		// Raw delta: input 500, output 77, no cache fields → normalized 500.
+		name:  "partial_echo",
+		start: llm.Usage{InputTokens: 740, CacheReadTokens: 200, CacheWriteTokens: 40},
+		delta: llm.Usage{InputTokens: 500, OutputTokens: 77},
+		want:  llm.Usage{InputTokens: 740, OutputTokens: 77, CacheReadTokens: 200, CacheWriteTokens: 40},
+	},
+	{
+		name:  "no_echo",
+		start: llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3},
+		delta: llm.Usage{OutputTokens: 5},
+		want:  llm.Usage{InputTokens: 23, OutputTokens: 5, CacheReadTokens: 5, CacheWriteTokens: 3},
+	},
+}
+
+func drainRecorderStream(t *testing.T, ctx context.Context, r *Recorder) {
+	t.Helper()
+	for _, err := range r.Stream(ctx, llm.CompletionRequest{}) {
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+// The metered usage of a streamed call counts an echoed input side once.
+func TestStreamUsageEchoCountedOnce(t *testing.T) {
+	for _, tc := range usageEchoCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var got []llm.Usage
+			ctx := WithUsageSink(t.Context(), func(u llm.Usage) { got = append(got, u) })
+			drainRecorderStream(t, ctx, Wrap(echoStreamProvider{start: tc.start, delta: tc.delta}, nil, "fixture", "profile", "", "", func() bool { return false }))
+			if len(got) != 1 || got[0] != tc.want {
+				t.Fatalf("metered %+v, want one call with %+v", got, tc.want)
+			}
+		})
+	}
+}
+
+// The llm_usage ledger gets one row per streamed call, with the echo counted once.
+func TestStreamUsageEchoLedgerRow(t *testing.T) {
+	dsn, _, err := db.DSN()
+	if err != nil {
+		t.Skipf("no database config (%v)", err)
+	}
+	pg, err := db.Open(dsn)
+	if err != nil {
+		t.Skipf("postgres unavailable (%v)", err)
+	}
+	defer pg.Close()
+	if err := pg.EnsureLLMUsageTable(); err != nil {
+		t.Fatal(err)
+	}
+	for _, tc := range usageEchoCases {
+		t.Run(tc.name, func(t *testing.T) {
+			profile := "usage-echo-" + uuid.NewString()
+			t.Cleanup(func() { _, _ = pg.Exec(`DELETE FROM llm_usage WHERE profile_name=$1`, profile) })
+			drainRecorderStream(t, t.Context(), Wrap(echoStreamProvider{start: tc.start, delta: tc.delta}, pg, "fixture", profile, "", "", func() bool { return false }))
+			var rows int
+			var got llm.Usage
+			err := pg.QueryRow(`SELECT count(*), COALESCE(sum(input_tokens),0), COALESCE(sum(output_tokens),0), COALESCE(sum(cache_read),0), COALESCE(sum(cache_write),0)
+FROM llm_usage WHERE profile_name=$1`, profile).Scan(&rows, &got.InputTokens, &got.OutputTokens, &got.CacheReadTokens, &got.CacheWriteTokens)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if rows != 1 || got != tc.want {
+				t.Fatalf("ledger rows=%d usage=%+v, want 1 row with %+v", rows, got, tc.want)
+			}
+		})
+	}
+}

server/task_llm.go

@@ -317,10 +317,14 @@ func (r *taskLLMRuntime) Complete(ctx context.Context, req llm.CompletionRequest
 }
 
 func completeTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest, hooks taskLLMStreamHooks) (llm.Message, string, llm.Usage, error) {
+	// total is the usage of the logical call: the sum of every physical attempt
+	// (same-provider retries and profile failover). Each attempt is already billed
+	// once by the recorder below; this sum only feeds the caller's accounting.
+	var total llm.Usage
 	for {
 		selection, err := hooks.current(ctx)
 		if err != nil {
-			return llm.Message{}, "", llm.Usage{}, err
+			return llm.Message{}, "", total, err
 		}
 		var (
 			msg     llm.Message
@@ -333,13 +337,14 @@ func completeTaskLLM(ctx context.Context, taskID string, req llm.CompletionReque
 		retries, backoffOf := sameProviderRetryPolicy(selection.retry)
 		for attempt := 0; ; attempt++ {
 			msg, sr, usage, callErr = selection.provider.Complete(ctx, req)
+			total.Add(usage)
 			if callErr != nil && ctx.Err() == nil &&
 				attempt < retries && isRetryableStreamError(callErr) {
 				backoff := backoffOf(attempt)
 				log.Printf("[task-llm] task %s non-streaming call failed, retrying on the same provider after %v (%d/%d): %v",
 					taskID, backoff, attempt+1, retries, callErr)
 				if sleepCtx(ctx, backoff) {
-					break // ctx cancelled during backoff → stop retrying
+					return llm.Message{}, "", total, ctx.Err() // cancelled during backoff → stop
 				}
 				continue
 			}
@@ -347,7 +352,7 @@ func completeTaskLLM(ctx context.Context, taskID string, req llm.CompletionReque
 		}
 		if callErr == nil {
 			resetLLMFailStreak(taskID, selection.profileID)
-			return msg, sr, usage, nil
+			return msg, sr, total, nil
 		}
 		// Non-quota failures on a chain profile escalate after a consecutive
 		// streak (#99): same advance path as quota exhaust, truthful reason.
@@ -356,31 +361,31 @@ func completeTaskLLM(ctx context.Context, taskID string, req llm.CompletionReque
 				cause := fmt.Errorf("profile #%d failed %d consecutive calls (last: %w)", selection.profileID, llmFailStreakThreshold, callErr)
 				transition, markErr := hooks.exhaust(selection, cause)
 				if markErr != nil {
-					return llm.Message{}, "", llm.Usage{}, fmt.Errorf("mark profile exhausted after %v: %w", callErr, markErr)
+					return llm.Message{}, "", total, fmt.Errorf("mark profile exhausted after %v: %w", callErr, markErr)
 				}
 				if transition.Advanced && !transition.Stale && hooks.transition != nil {
 					hooks.transition(selection, transition, callErr)
 				}
 				if !transition.Stale && transition.NextProfileID == nil {
-					return llm.Message{}, "", llm.Usage{}, &taskLLMError{taskID: taskID, chainExhausted: transition.ChainExhausted, cause: callErr}
+					return llm.Message{}, "", total, &taskLLMError{taskID: taskID, chainExhausted: transition.ChainExhausted, cause: callErr}
 				}
 				continue // replay the same logical request on the next profile
 			}
-			return llm.Message{}, "", llm.Usage{}, callErr
+			return llm.Message{}, "", total, callErr
 		}
 		// profileID=0: the explicit chain was cleared; non-quota error: pass through. Neither changes the task failover state.
 		if selection.profileID == 0 || !isQuotaExhaustedError(callErr) {
-			return llm.Message{}, "", llm.Usage{}, callErr
+			return llm.Message{}, "", total, callErr
 		}
 		transition, markErr := hooks.exhaust(selection, callErr)
 		if markErr != nil {
-			return llm.Message{}, "", llm.Usage{}, fmt.Errorf("mark profile quota exhausted after %v: %w", callErr, markErr)
+			return llm.Message{}, "", total, fmt.Errorf("mark profile quota exhausted after %v: %w", callErr, markErr)
 		}
 		if transition.Advanced && !transition.Stale && hooks.transition != nil {
 			hooks.transition(selection, transition, callErr)
 		}
 		if !transition.Stale && transition.NextProfileID == nil {
-			return llm.Message{}, "", llm.Usage{}, &taskLLMError{taskID: taskID, chainExhausted: transition.ChainExhausted, cause: callErr}
+			return llm.Message{}, "", total, &taskLLMError{taskID: taskID, chainExhausted: transition.ChainExhausted, cause: callErr}
 		}
 		// No output has been delivered to the caller, so replaying the same logical request on the next profile is safe.
 	}
@@ -397,6 +402,35 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 			committed := false
 			var pending []llm.StreamEvent
 			var streamErr error
+			// The caller's llm.Accumulator sums usage across the whole logical call
+			// (every attempt and profile): message_start is added, message_delta is
+			// folded with MergeEcho. Folding one attempt's echo against the sum of
+			// earlier attempts would lose input/cache tokens, so each attempt's echoes
+			// are normalized here against that attempt alone and only the increment
+			// is passed on, as a message_start. The recorder below already billed the
+			// physical attempt; this only shapes what the caller adds up.
+			var attemptUsage llm.Usage
+			forward := func(event llm.StreamEvent) bool {
+				switch event.Type {
+				case llm.SEMessageStart:
+					attemptUsage.Add(event.Usage)
+				case llm.SEMessageDelta:
+					next := attemptUsage
+					next.MergeEcho(event.Usage)
+					inc := llm.Usage{
+						InputTokens:      next.InputTokens - attemptUsage.InputTokens,
+						OutputTokens:     next.OutputTokens - attemptUsage.OutputTokens,
+						CacheReadTokens:  next.CacheReadTokens - attemptUsage.CacheReadTokens,
+						CacheWriteTokens: next.CacheWriteTokens - attemptUsage.CacheWriteTokens,
+					}
+					attemptUsage = next
+					if inc != (llm.Usage{}) && !yield(llm.StreamEvent{Type: llm.SEMessageStart, Usage: inc}, nil) {
+						return false
+					}
+					event.Usage = llm.Usage{}
+				}
+				return yield(event, nil)
+			}
 			retries, backoffOf := sameProviderRetryPolicy(selection.retry)
 			// Same-provider safe-window retry: a transient failure before committed
 			// (nothing delivered to the caller yet) can be replayed verbatim without
@@ -405,6 +439,7 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 				committed = false
 				pending = nil
 				streamErr = nil
+				attemptUsage = llm.Usage{}
 				for event, err := range selection.provider.Stream(ctx, req) {
 					if err != nil {
 						streamErr = err
@@ -416,24 +451,34 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 					}
 					if !committed {
 						for _, buffered := range pending {
-							if !yield(buffered, nil) {
+							if !forward(buffered) {
 								return
 							}
 						}
 						pending = nil
 						committed = true
 					}
-					if !yield(event, nil) {
+					if !forward(event) {
 						return
 					}
 				}
+				if streamErr != nil && !committed {
+					// A failed uncommitted attempt delivers none of its events (they are
+					// never replayed), but the usage it reported survives as one
+					// message_start so the logical call still counts it.
+					if u := pendingUsage(pending); u != (llm.Usage{}) && !yield(llm.StreamEvent{Type: llm.SEMessageStart, Usage: u}, nil) {
+						return
+					}
+					pending = nil
+				}
 				if streamErr != nil && !committed && ctx.Err() == nil &&
 					attempt < retries && isRetryableStreamError(streamErr) {
 					backoff := backoffOf(attempt)
 					log.Printf("[task-llm] task %s pre-commit stream failure, retrying on the same provider after %v (%d/%d): %v",
 						taskID, backoff, attempt+1, retries, streamErr)
 					if sleepCtx(ctx, backoff) {
-						break // ctx cancelled during backoff → stop retrying
+						yield(llm.StreamEvent{}, ctx.Err()) // cancelled during backoff → stop
+						return
 					}
 					continue
 				}
@@ -442,7 +487,7 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 			if streamErr == nil {
 				resetLLMFailStreak(taskID, selection.profileID)
 				for _, buffered := range pending {
-					if !yield(buffered, nil) {
+					if !forward(buffered) {
 						return
 					}
 				}
@@ -474,11 +519,6 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 			// bundle was still in use. Agent/global fallback errors follow the legacy
 			// behavior and never mutate task failover state.
 			if selection.profileID == 0 || !isQuotaExhaustedError(streamErr) {
-				for _, buffered := range pending {
-					if !yield(buffered, nil) {
-						return
-					}
-				}
 				yield(llm.StreamEvent{}, streamErr)
 				return
 			}
@@ -508,9 +548,25 @@ func streamTaskLLM(ctx context.Context, taskID string, req llm.CompletionRequest
 	}
 }
 
+// pendingUsage is the usage the buffered (uncommitted) events of one attempt
+// reported. Only message_start can be buffered: message_delta commits.
+func pendingUsage(pending []llm.StreamEvent) llm.Usage {
+	var u llm.Usage
+	for _, ev := range pending {
+		if ev.Type == llm.SEMessageStart {
+			u.Add(ev.Usage)
+		}
+	}
+	return u
+}
+
+// streamEventCommitsOutput reports whether delivering event makes the attempt
+// unreplayable. Signed and redacted thinking and tool-use signatures are opaque
+// output the model bound to this exact response, so they commit like text.
 func streamEventCommitsOutput(event llm.StreamEvent) bool {
 	switch event.Type {
-	case llm.SETextDelta, llm.SEThinkingDelta, llm.SEToolInputJSON:
+	case llm.SETextDelta, llm.SEThinkingDelta, llm.SEToolInputJSON,
+		llm.SEThinkingSignature, llm.SERedactedThinking, llm.SEToolUseSignature:
 		return event.Text != ""
 	case llm.SEToolUseStart, llm.SEMessageDelta, llm.SEMessageStop:
 		return true

server/task_llm_usage_test.go

@@ -0,0 +1,286 @@
+package server
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"iter"
+	"testing"
+	"time"
+
+	"github.com/Autumn-27/artex/agent"
+	"github.com/Autumn-27/artex/db"
+	"github.com/Autumn-27/artex/llmrec"
+	"github.com/Autumn-27/norma/llm"
+)
+
+// Usage reported by one failed attempt, and by a successful one. A stream
+// reports the input side in message_start and echoes it, with the output, in
+// message_delta; the atomic path returns the attempt's normalized usage.
+var (
+	failedAttemptUsage = llm.Usage{InputTokens: 11, OutputTokens: 2, CacheReadTokens: 3, CacheWriteTokens: 2}
+	okStartUsage       = llm.Usage{InputTokens: 13, CacheReadTokens: 3, CacheWriteTokens: 2}
+	okDeltaUsage       = llm.Usage{InputTokens: 17, OutputTokens: 5, CacheReadTokens: 4, CacheWriteTokens: 2}
+	okAttemptUsage     = llm.Usage{InputTokens: 17, OutputTokens: 5, CacheReadTokens: 4, CacheWriteTokens: 2}
+)
+
+// usageAttemptProvider fails its first fail attempts (always, when fail < 0)
+// after reporting failedAttemptUsage, then answers "done".
+type usageAttemptProvider struct {
+	fail    int
+	failErr error
+	onFail  func()
+	// extra events a failed stream attempt emits before its error.
+	failEvents []llm.StreamEvent
+	calls      int
+}
+
+func (p *usageAttemptProvider) failing() bool {
+	p.calls++
+	failed := p.fail < 0 || p.calls <= p.fail
+	if failed && p.onFail != nil {
+		p.onFail()
+	}
+	return failed
+}
+
+func (p *usageAttemptProvider) Complete(context.Context, llm.CompletionRequest) (llm.Message, string, llm.Usage, error) {
+	if p.failing() {
+		return llm.Message{}, "", failedAttemptUsage, p.failErr
+	}
+	return llm.Message{Role: llm.RoleAssistant, Content: []llm.ContentBlock{llm.TextBlock("done")}}, "end_turn", okAttemptUsage, nil
+}
+
+func (p *usageAttemptProvider) Stream(context.Context, llm.CompletionRequest) iter.Seq2[llm.StreamEvent, error] {
+	return func(yield func(llm.StreamEvent, error) bool) {
+		if p.failing() {
+			events := append([]llm.StreamEvent{{Type: llm.SEMessageStart, Usage: failedAttemptUsage}}, p.failEvents...)
+			for _, ev := range events {
+				if !yield(ev, nil) {
+					return
+				}
+			}
+			yield(llm.StreamEvent{}, p.failErr)
+			return
+		}
+		for _, ev := range []llm.StreamEvent{
+			{Type: llm.SEMessageStart, Usage: okStartUsage},
+			{Type: llm.SETextDelta, Text: "done"},
+			{Type: llm.SEMessageDelta, StopReason: "end_turn", Usage: okDeltaUsage},
+			{Type: llm.SEMessageStop},
+		} {
+			if !yield(ev, nil) {
+				return
+			}
+		}
+	}
+}
+
+// logicalResult is what the SDK sees for one logical call.
+type logicalResult struct {
+	usage  llm.Usage
+	text   string
+	events []llm.StreamEvent
+	err    error
+}
+
+func runLogicalCall(ctx context.Context, stream bool, taskID string, hooks taskLLMStreamHooks) logicalResult {
+	if !stream {
+		msg, _, usage, err := completeTaskLLM(ctx, taskID, llm.CompletionRequest{}, hooks)
+		return logicalResult{usage: usage, text: msg.Text(), err: err}
+	}
+	var r logicalResult
+	acc := llm.NewAccumulator()
+	for ev, err := range streamTaskLLM(ctx, taskID, llm.CompletionRequest{}, hooks) {
+		if err != nil {
+			r.err = err
+			break
+		}
+		r.events = append(r.events, ev)
+		acc.Add(ev)
+	}
+	r.usage, r.text = acc.Usage, acc.Message().Text()
+	return r
+}
+
+func singleProfileHooks(p llm.Provider, retry agent.RetryConfig) taskLLMStreamHooks {
+	return taskLLMStreamHooks{
+		current: func(context.Context) (taskLLMSelection, error) {
+			return taskLLMSelection{provider: p, retry: retry}, nil
+		},
+		exhaust: func(taskLLMSelection, error) (db.TaskLLMTransition, error) {
+			return db.TaskLLMTransition{}, nil
+		},
+	}
+}
+
+func sumUsage(us ...llm.Usage) llm.Usage {
+	var t llm.Usage
+	for _, u := range us {
+		t.Add(u)
+	}
+	return t
+}
+
+var usageModes = []struct {
+	name   string
+	stream bool
+}{{"atomic", false}, {"stream", true}}
+
+func TestTaskLLMRetrySumsAttemptUsage(t *testing.T) {
+	for _, m := range usageModes {
+		t.Run(m.name, func(t *testing.T) {
+			p := &usageAttemptProvider{fail: 1, failErr: errors.New("connection reset by peer")}
+			r := runLogicalCall(t.Context(), m.stream, "p12-retry", singleProfileHooks(p, agent.RetryConfig{StreamAttempts: 1, StreamInterval: time.Millisecond}))
+			if r.err != nil {
+				t.Fatal(r.err)
+			}
+			want := sumUsage(failedAttemptUsage, okAttemptUsage) // {28 7 7 4}
+			if r.usage != want || p.calls != 2 || r.text != "done" {
+				t.Fatalf("usage=%+v want %+v, calls=%d, text=%q", r.usage, want, p.calls, r.text)
+			}
+		})
+	}
+}
+
+func TestTaskLLMExhaustedRetriesReturnSummedUsage(t *testing.T) {
+	for _, m := range usageModes {
+		t.Run(m.name, func(t *testing.T) {
+			p := &usageAttemptProvider{fail: -1, failErr: errors.New("connection reset by peer")}
+			r := runLogicalCall(t.Context(), m.stream, "p12-exhausted", singleProfileHooks(p, agent.RetryConfig{StreamAttempts: 1, StreamInterval: time.Millisecond}))
+			if r.err == nil || r.err.Error() != "connection reset by peer" {
+				t.Fatalf("err=%v", r.err)
+			}
+			want := sumUsage(failedAttemptUsage, failedAttemptUsage)
+			if r.usage != want || p.calls != 2 {
+				t.Fatalf("usage=%+v want %+v, calls=%d", r.usage, want, p.calls)
+			}
+		})
+	}
+}
+
+func TestTaskLLMProfileFailoverSumsUsage(t *testing.T) {
+	for _, m := range usageModes {
+		t.Run(m.name, func(t *testing.T) {
+			first := &usageAttemptProvider{fail: -1, failErr: errors.New("openai: status 402: insufficient_quota")}
+			second := &usageAttemptProvider{}
+			active := int64(11)
+			hooks := taskLLMStreamHooks{
+				current: func(context.Context) (taskLLMSelection, error) {
+					if active == 11 {
+						return taskLLMSelection{profileID: 11, provider: first}, nil
+					}
+					return taskLLMSelection{profileID: 22, provider: second}, nil
+				},
+				exhaust: func(taskLLMSelection, error) (db.TaskLLMTransition, error) {
+					active = 22
+					next := active
+					return db.TaskLLMTransition{PreviousProfileID: 11, NextProfileID: &next, Advanced: true}, nil
+				},
+			}
+			r := runLogicalCall(t.Context(), m.stream, "p12-failover-"+m.name, hooks)
+			if r.err != nil {
+				t.Fatal(r.err)
+			}
+			want := sumUsage(failedAttemptUsage, okAttemptUsage)
+			if r.usage != want || first.calls != 1 || second.calls != 1 || r.text != "done" {
+				t.Fatalf("usage=%+v want %+v, calls first=%d second=%d, text=%q", r.usage, want, first.calls, second.calls, r.text)
+			}
+		})
+	}
+}
+
+func TestTaskLLMCancelDuringBackoffStops(t *testing.T) {
+	for _, m := range usageModes {
+		t.Run(m.name, func(t *testing.T) {
+			ctx, cancel := context.WithCancel(t.Context())
+			defer cancel()
+			p := &usageAttemptProvider{fail: -1, failErr: errors.New("connection reset by peer")}
+			// Cancel once the retry is waiting out its (long) backoff.
+			p.onFail = func() { time.AfterFunc(20*time.Millisecond, cancel) }
+			r := runLogicalCall(ctx, m.stream, "p12-cancel", singleProfileHooks(p, agent.RetryConfig{StreamAttempts: 2, StreamInterval: time.Minute}))
+			if !errors.Is(r.err, context.Canceled) {
+				t.Fatalf("err=%v, want context.Canceled", r.err)
+			}
+			if p.calls != 1 || r.usage != failedAttemptUsage {
+				t.Fatalf("calls=%d usage=%+v", p.calls, r.usage)
+			}
+		})
+	}
+}
+
+func TestTaskLLMUncommittedStreamAttemptKeepsUsageWithoutReplay(t *testing.T) {
+	p := &usageAttemptProvider{
+		fail:    1,
+		failErr: errors.New("anthropic: overloaded_error"),
+		// Buffered, non-committing events of the failed attempt.
+		failEvents: []llm.StreamEvent{{Type: llm.SEThinkingDelta}, {Type: llm.SEToolInputJSON}},
+	}
+	r := runLogicalCall(t.Context(), true, "p12-uncommitted", singleProfileHooks(p, agent.RetryConfig{StreamAttempts: 1, StreamInterval: time.Millisecond}))
+	if r.err != nil {
+		t.Fatal(r.err)
+	}
+	if want := sumUsage(failedAttemptUsage, okAttemptUsage); r.usage != want {
+		t.Fatalf("usage=%+v want %+v", r.usage, want)
+	}
+	if r.text != "done" {
+		t.Fatalf("text=%q, want the second attempt's only", r.text)
+	}
+	// The failed attempt contributes one usage-only message_start, nothing else.
+	if len(r.events) == 0 || r.events[0].Type != llm.SEMessageStart || r.events[0].Usage != failedAttemptUsage {
+		t.Fatalf("first event %+v", r.events)
+	}
+	for _, ev := range r.events {
+		if ev.Type == llm.SEThinkingDelta || ev.Type == llm.SEToolInputJSON {
+			t.Fatalf("buffered event of the failed attempt was delivered: %+v", r.events)
+		}
+	}
+}
+
+func TestTaskLLMOpaqueThinkingCommitsStream(t *testing.T) {
+	defer withZeroRetryBackoff()()
+	for _, kind := range []llm.StreamEventType{llm.SEThinkingSignature, llm.SERedactedThinking, llm.SEToolUseSignature} {
+		t.Run(string(kind), func(t *testing.T) {
+			if !streamEventCommitsOutput(llm.StreamEvent{Type: kind, Text: "opaque"}) {
+				t.Fatalf("%s does not commit", kind)
+			}
+			// A retryable failure after the opaque block is surfaced, not replayed.
+			p := &scriptedLLMProvider{events: []llm.StreamEvent{{Type: kind, Text: "opaque"}}, err: errors.New("connection reset by peer")}
+			events, err := collectTaskLLMStream(streamTaskLLM(t.Context(), "p12-opaque", llm.CompletionRequest{}, singleProfileHooks(p, agent.RetryConfig{})))
+			if err == nil || p.calls != 1 || len(events) != 1 || events[0].Type != kind {
+				t.Fatalf("calls=%d events=%+v err=%v", p.calls, events, err)
+			}
+		})
+	}
+}
+
+// The recorder below the task router writes one llm_usage row per physical
+// attempt; summing the attempts for the logical call adds no row.
+func TestTaskLLMRetryKeepsOneLedgerRowPerPhysicalCall(t *testing.T) {
+	m, err := NewManager(t.TempDir(), "")
+	if err != nil {
+		t.Skipf("postgres unavailable (%v) — skipping", err)
+	}
+	defer m.Close()
+	pg := m.PG()
+	for _, mode := range usageModes {
+		t.Run(mode.name, func(t *testing.T) {
+			taskID := fmt.Sprintf("p12-ledger-%s-%d", mode.name, time.Now().UnixNano())
+			t.Cleanup(func() { _, _ = pg.Exec(`DELETE FROM llm_usage WHERE task_id=$1`, taskID) })
+			p := &usageAttemptProvider{fail: 1, failErr: errors.New("connection reset by peer")}
+			rec := llmrec.Wrap(p, pg, "test-model", "test-profile", "", "", func() bool { return false })
+			ctx := llmrec.WithTaskID(t.Context(), taskID)
+			r := runLogicalCall(ctx, mode.stream, taskID, singleProfileHooks(rec, agent.RetryConfig{StreamAttempts: 1, StreamInterval: time.Millisecond}))
+			if r.err != nil {
+				t.Fatal(r.err)
+			}
+			var rows, failed int
+			if err := pg.QueryRow(`SELECT count(*), count(*) FILTER (WHERE status='error') FROM llm_usage WHERE task_id=$1`, taskID).Scan(&rows, &failed); err != nil {
+				t.Fatal(err)
+			}
+			if rows != 2 || failed != 1 || p.calls != 2 {
+				t.Fatalf("llm_usage rows=%d (error %d), physical calls=%d; want 2 rows, 1 error", rows, failed, p.calls)
+			}
+		})
+	}
+}

sidequestion/service.go

@@ -32,8 +32,11 @@ func (s SideQuestionService) Answer(ctx context.Context, req llm.CompletionReque
 				out.Text += ev.Text
 			case llm.SEToolUseStart:
 				out.ToolUse = true
-			case llm.SEMessageStart, llm.SEMessageDelta:
+			case llm.SEMessageStart:
 				out.Usage.Add(ev.Usage)
+			case llm.SEMessageDelta:
+				// message_delta may echo message_start's input side: MergeEcho, not Add.
+				out.Usage.MergeEcho(ev.Usage)
 			case llm.SEMessageStop:
 				complete = true
 			}

sidequestion/usage_echo_test.go

@@ -0,0 +1,52 @@
+package sidequestion
+
+import (
+	"context"
+	"iter"
+	"testing"
+
+	"github.com/Autumn-27/norma/llm"
+)
+
+// A streamed side answer counts message_delta's echo of the input side once.
+func TestAnswerStreamUsageEchoCountedOnce(t *testing.T) {
+	for _, tc := range []struct {
+		name         string
+		start, delta llm.Usage
+		want         llm.Usage
+	}{
+		{"full_echo",
+			llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3},
+			llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3, OutputTokens: 5},
+			llm.Usage{InputTokens: 23, OutputTokens: 5, CacheReadTokens: 5, CacheWriteTokens: 3}},
+		{"partial_echo",
+			llm.Usage{InputTokens: 740, CacheReadTokens: 200, CacheWriteTokens: 40},
+			llm.Usage{InputTokens: 500, OutputTokens: 77},
+			llm.Usage{InputTokens: 740, OutputTokens: 77, CacheReadTokens: 200, CacheWriteTokens: 40}},
+		{"no_echo",
+			llm.Usage{InputTokens: 23, CacheReadTokens: 5, CacheWriteTokens: 3},
+			llm.Usage{OutputTokens: 5},
+			llm.Usage{InputTokens: 23, OutputTokens: 5, CacheReadTokens: 5, CacheWriteTokens: 3}},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			p := fakeProvider{stream: func(context.Context, llm.CompletionRequest) iter.Seq2[llm.StreamEvent, error] {
+				return func(yield func(llm.StreamEvent, error) bool) {
+					for _, ev := range []llm.StreamEvent{
+						{Type: llm.SEMessageStart, Usage: tc.start},
+						{Type: llm.SETextDelta, Text: "answer"},
+						{Type: llm.SEMessageDelta, StopReason: "end_turn", Usage: tc.delta},
+						{Type: llm.SEMessageStop},
+					} {
+						if !yield(ev, nil) {
+							return
+						}
+					}
+				}
+			}}
+			out, err := (SideQuestionService{Provider: p}).Answer(t.Context(), llm.CompletionRequest{}, true, nil)
+			if err != nil || out.Text != "answer" || out.Usage != tc.want {
+				t.Fatalf("answer=%+v err=%v, want usage %+v", out, err, tc.want)
+			}
+		})
+	}
+}

web/package.json

@@ -21,7 +21,6 @@
   },
   "dependencies": {
     "@antv/g6": "^5.1.1",
-    "@antv/graphin": "^3.0.5",
     "@base-ui/react": "^1.6.0",
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/modifiers": "^9.0.0",
@@ -40,7 +39,7 @@
     "geist": "^1.7.2",
     "input-otp": "^1.4.2",
     "lucide-react": "^1.22.0",
-    "next": "^16.2.9",
+    "next": "^16.4.6",
     "next-themes": "^0.4.6",
     "radix-ui": "^1.6.0",
     "react": "^19.2.7",
@@ -52,7 +51,6 @@
     "react-resizable-panels": "^4.12.0",
     "recharts": "^3.8.0",
     "remark-gfm": "^4.0.1",
-    "shadcn": "^4.12.0",
     "simple-icons": "^16.24.1",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.6.0",
@@ -74,6 +72,7 @@
     "husky": "^9.1.7",
     "lint-staged": "^16.4.0",
     "postcss": "^8.5.16",
+    "shadcn": "^4.12.0",
     "tailwindcss": "^4.1.5",
     "ts-node": "^10.9.2",
     "tw-animate-css": "^1.4.0",