Derive turn event payloads from canonical result fields

internal/agents/antigravity.go

@@ -166,11 +166,6 @@ func (m *Manager) agyTurnEnded(ctx context.Context, l *live, p antigravityProces
 	if !success {
 		r.result = res.Error
 	}
-	r.payload = map[string]any{
-		"subtype":  r.subtype,
-		"is_error": r.isError,
-		"result":   r.result,
-	}
 	return m.turnEnded(ctx, l, r)
 }
 

internal/agents/codex.go

@@ -270,11 +270,6 @@ func (m *Manager) codexTurnCompleted(ctx context.Context, l *live, s *codex.Sess
 			m.mu.Unlock()
 		}
 	}
-	res.payload = map[string]any{
-		"subtype":     res.subtype,
-		"is_error":    res.isError,
-		"result":      res.result,
-		"vendor_uuid": turn.ID,
-	}
+	res.metadata = map[string]any{"vendor_uuid": turn.ID}
 	return m.turnEnded(ctx, l, res)
 }

internal/agents/lead.go

@@ -304,7 +304,7 @@ func (m *Manager) leadTurnEnded(ctx context.Context, l *live, res endResult) err
 	finished := !res.isError && !interrupted && strings.TrimSpace(res.result) != ""
 	handoff := compacting && finished
 
-	payload := res.payload
+	payload := res.payload()
 	if handoff {
 		payload["handoff"] = true
 	}

internal/agents/manager.go

@@ -1086,8 +1086,13 @@ func (m *Manager) handle(ctx context.Context, l *live, ev claude.Event) error {
 			subtype: res.Subtype,
 			isError: res.IsError,
 			result:  res.Result,
-			payload: store.ToPayload(res),
-			window:  res.ModelUsage[l.contextModel].ContextWindow,
+			metadata: map[string]any{
+				"duration_ms":    res.DurationMS,
+				"num_turns":      res.NumTurns,
+				"total_cost_usd": res.TotalCostUSD,
+				"modelUsage":     store.ToPayload(res.ModelUsage),
+			},
+			window: res.ModelUsage[l.contextModel].ContextWindow,
 		})
 
 	case "stream_event":
@@ -1153,11 +1158,22 @@ func (m *Manager) trackSubagents(ctx context.Context, l *live, raw map[string]an
 }
 
 type endResult struct {
-	subtype string
-	isError bool
-	result  string
-	payload map[string]any
-	window  int
+	subtype  string
+	isError  bool
+	result   string
+	metadata map[string]any
+	window   int
+}
+
+func (r endResult) payload() map[string]any {
+	payload := map[string]any{}
+	for key, value := range r.metadata {
+		payload[key] = value
+	}
+	payload["subtype"] = r.subtype
+	payload["is_error"] = r.isError
+	payload["result"] = r.result
+	return payload
 }
 
 func (m *Manager) turnEnded(ctx context.Context, l *live, res endResult) error {
@@ -1178,7 +1194,7 @@ func (m *Manager) turnEnded(ctx context.Context, l *live, res endResult) error {
 
 	finished := !res.isError && !interrupted && strings.TrimSpace(res.result) != ""
 
-	payload := res.payload
+	payload := res.payload()
 	if l.member != "" {
 		payload["member"] = l.member
 	}

internal/agents/review.go

@@ -547,7 +547,7 @@ func (m *Manager) reviewTurnEnded(ctx context.Context, l *live, res endResult) e
 	interrupted := l.interrupted
 	m.mu.Unlock()
 
-	err := m.emit(ctx, l, agentActor, "turn.ended", res.payload)
+	err := m.emit(ctx, l, agentActor, "turn.ended", res.payload())
 	if err != nil {
 		return err
 	}