feat: Wave 1 complete — state machine, Paseo hub, collision detection, PTY search

- Task state machine: TIMED_OUT state, retriable steps, timeout detection
- Paseo hub: paseo-client.ts (HTTP+CLI), PaseoBackend (AgentBackend), 14 tests
- Collision detection: collision-detector.ts, conflict-index.ts, ws-frames type
- PTY search: ring buffer, search route, capture-pane fallback

.omo/plans/paseo-orchestrator.md

@@ -0,0 +1,239 @@
+# Paseo-like Orchestrator — Implementation Plan
+
+> **Goal:** Transform BooCode into a Paseo-style thin-client orchestration layer with observability, dynamic workflows, resumability, background subagents, multi-modal, and cache shape telemetry.
+>
+> **Architecture:** Durable agent execution engine beneath thin chat/coder frontends. Trace system as foundation, workflow engine as the structural addition, everything else layered on top.
+>
+> **Inspired by:** Paseo (agent lifecycle, worktree isolation), Whale (workflow engine, cache telemetry), OpenCode (session resume), Claude Code (workflow script format).
+
+---
+
+## TL;DR
+
+> **Quick Summary**: Build a durable orchestration layer with trace observability, dynamic JS workflows, session persistence, background subagents, and multi-modal support over 5 phases.
+>
+> **Deliverables**:
+> - Trace system with DB persistence + viewer UI
+> - Dynamic workflow engine (JS sandbox, agent/parallel/pipeline)
+> - Workflow resumability (hash-based step caching)
+> - Background subagent runtime
+> - Session persistence across refreshes
+> - Cache shape telemetry (DeepSeek KV cache viz)
+> - Multi-modal attachment support
+>
+> **Estimated Effort**: XL — 5 phases, ~2-3 weeks total
+> **Parallel Execution**: YES — phases 1-2 can partially overlap
+> **Critical Path**: Trace system → Workflow engine → All downstream features
+
+---
+
+## Context
+
+### Original Request
+User wants BooCode to become "like Paseo — a thin client" with observability, dynamic workflows, session persistence, background agents, multi-modal, cache shape telemetry, and workflow resumability. They invoked skills across model evaluation, long context, SGLang, LangChain, LangSmith, agentic eval, agent harness construction, agent governance, and chat SDKs — indicating broad ambition for a production-quality AI coding platform.
+
+### Key Decisions
+- **Trace system first**: Foundation for all debugging and optimization
+- **isolated-vm for workflow sandbox**: Node-native, no external deps
+- **DB-backed sessions**: Postgres for trace store + session state
+- **Existing WS frames + new `tool_trace` frame**: Live streaming to frontend
+- **Phase ordering**: Foundation (trace) → UX (persistence) → Power (workflows) → Polish (background/multi-modal/cache)
+
+---
+
+## Phases
+
+### Phase 1: Trace System + Observability
+**Est. effort**: 3-4 days
+
+Core observability infrastructure. Every tool call gets timed, logged, and persisted.
+
+**Deliverables**:
+- `tool_traces` DB table (id, session_id, chat_id, turn_number, tool_name, input, output, started_at, finished_at, latency_ms, tokens_used, cache_tokens, reasoning_tokens, error, outcome)
+- Instrumentation in `tool-phase.ts` wrapping `executeToolCall` with start/end timing
+- `tool_trace` WS frame type for live streaming to frontend
+- GET `/api/chats/:id/traces` endpoint (paginated)
+- Trace viewer pane (collapsible tree, timing bars, expand/collapse per call)
+
+**Files to create**: 5-7 files across server + web + contracts
+**Dependencies**: None — standalone feature
+
+---
+
+### Phase 2: Session Persistence + Resume
+**Est. effort**: 2-3 days
+
+Agent state survives browser refresh. Active sessions can be resumed.
+
+**Deliverables**:
+- Serialize active agent state to DB on each turn boundary
+- Restore state on WS reconnect (existing `snapshot` frame enhanced)
+- Agent session timeline view (history of all turns in a session)
+- Coder pane rehydrates from persisted state
+
+**Files to modify**: ws.ts, useSessionStream.ts, session store, dispatcher
+**Dependencies**: None — standalone, but benefits from Phase 1 trace data
+
+---
+
+### Phase 3: Dynamic Workflow Engine
+**Est. effort**: 5-7 days
+
+JS sandbox for multi-agent orchestration. Claude Code compatible.
+
+**Deliverables**:
+- `isolated-vm` sandbox (or Node `vm` module with restricted context)
+- Workflow API: `agent()`, `parallel()`, `pipeline()`, `phase()`, `budget()`, `log()`, `args`
+- Workflow file discovery (`.boocode/workflows/*.js` → project, `~/.boocode/workflows/*.js` → global)
+- Built-in workflow catalog (deep-research, multi-review, etc.)
+- Workflow manager with concurrency limits, token budgets
+- Integration with existing Orchestrator panel for UI
+
+**Files to create**: 10-15 files (workflow runtime, scheduler, tool bridge, manager, catalog)
+**Dependencies**: Phase 1 traces feed into workflow observability
+
+**Workflow Resumability** (within Phase 3):
+- SHA-256 hash of agent spec (prompt + options)
+- Cache completed results by hash
+- On re-run, skip cached agents, only execute new/changed ones
+- In-memory cache for current session, optional DB persistence
+
+**Est. effort**: 1-2 days within Phase 3
+
+---
+
+### Phase 4: Background Subagents
+**Est. effort**: 2-3 days
+
+Non-blocking subagent execution. `spawn_subagent` returns immediately, results collected later.
+
+**Deliverables**:
+- Background task queue (reuses existing `tasks` table)
+- `spawn_subagent` tool that creates a task and returns immediately
+- `subagent_status` tool to poll completion
+- `subagent_result` tool to retrieve output
+- Background agent pane showing running/completed subagents
+- Notifications via hooks when background tasks complete
+
+**Files to create**: 3-5 files across server + web
+**Dependencies**: Phase 1 traces, Phase 2 session persistence
+
+---
+
+### Phase 5: Multi-modal + Cache Shape (Polish)
+**Est. effort**: 2-3 days
+
+Image/file attachment support + DeepSeek cache hit visualization.
+
+**Deliverables (Multi-modal)**:
+- Image/file attachment storage (tmpfs, referenced in message)
+- Forward image content through DeepSeek API's multimodal support
+- Render attached images in message bubble
+- Model can "see" screenshots, diagrams, UI mocks
+
+**Deliverables (Cache Shape)**:
+- Extract `prompt_cache_hit_tokens` from DeepSeek provider metadata
+- Build cache segment visualization (system prompt, tool schema, conversation)
+- Per-turn cache hit rate in trace viewer
+- Cumulative cache stats in session view
+
+**Files to create**: 3-5 files
+**Dependencies**: Phase 1 traces (for cache shape), existing DeepSeek integration
+
+---
+
+## Execution Strategy
+
+### Parallel Execution Waves
+
+```
+Wave 1 (Start Immediately):
+├── Phase 1: Trace system backend (tool_traces table + instrumentation) [deep]
+├── Phase 1: Trace viewer frontend [visual-engineering]
+└── Phase 2: Session persistence backbone [deep]
+
+Wave 2 (After Wave 1):
+├── Phase 3: Workflow engine sandbox + API surface [deep]
+├── Phase 3: Workflow file discovery + manager [unspecified-high]
+├── Phase 3: Workflow resumability cache [quick]
+└── Phase 4: Background subagent queue + tools [unspecified-high]
+
+Wave 3 (After Wave 2):
+├── Phase 4: Background agent pane + notifications [visual-engineering]
+├── Phase 5: Multi-modal attachment pipeline [deep]
+└── Phase 5: Cache shape telemetry UI [visual-engineering]
+
+Wave FINAL:
+├── F1: Plan compliance audit (oracle)
+├── F2: Code quality review (unspecified-high)
+├── F3: Integration QA (unspecified-high)
+└── F4: Scope fidelity check (deep)
+```
+
+---
+
+## TODOs
+
+> Phase 1: Trace System + Observability
+
+- [ ] 1. Create tool_traces DB table + migration
+
+- [ ] 2. Add tool_trace WS frame + contracts schema
+
+- [ ] 3. Instrument tool-phase.ts with start/end timing
+
+- [ ] 4. Add GET /api/chats/:id/traces endpoint
+
+- [ ] 5. Build trace viewer frontend component
+
+> Phase 2: Session Persistence + Resume
+
+- [ ] 6. Serialize agent state to DB on turn boundaries
+
+- [ ] 7. Restore state on WS reconnect
+
+- [ ] 8. Agent session timeline view
+
+> Phase 3: Dynamic Workflow Engine
+
+- [ ] 9. Create isolated-vm workflow sandbox
+
+- [ ] 10. Implement agent/parallel/pipeline primitives
+
+- [ ] 11. Workflow file discovery system
+
+- [ ] 12. Workflow manager + built-in catalog
+
+- [ ] 13. Workflow resumability (hash-based cache)
+
+- [ ] 14. Workflow UI integration with Orchestrator panel
+
+> Phase 4: Background Subagents
+
+- [ ] 15. Background task queue + spawn_subagent tool
+
+- [ ] 16. subagent_status + subagent_result tools
+
+- [ ] 17. Background agent pane
+
+> Phase 5: Multi-modal + Cache Shape
+
+- [ ] 18. Multi-modal attachment pipeline
+
+- [ ] 19. Image render in message bubble
+
+- [ ] 20. Cache shape telemetry data pipeline
+
+- [ ] 21. Cache shape visualization in trace viewer
+
+---
+
+## Success Criteria
+
+- Tool trace viewer shows every call with timing bars and token costs
+- Browser refresh preserves agent session state
+- Workflow scripts run in isolated sandbox with agent/parallel/pipeline
+- Re-running a workflow skips cached agents (hash-based)
+- Background subagents run independently, results collected later
+- Model can see attached images in chat
+- Cache hit rate visible per-turn and cumulative

apps/booterm/src/index.ts

@@ -5,6 +5,7 @@ import { getPool, closeDb } from './db.js';
 import { registerHealthRoutes } from './routes/health.js';
 import { registerTerminalRoutes } from './routes/terminals.js';
 import { registerSessionRoutes } from './routes/sessions.js';
+import { registerSearchRoutes } from './routes/search.js';
 import { registerWsAttachRoute } from './ws/attach.js';
 
 async function main(): Promise<void> {
@@ -35,6 +36,7 @@ async function main(): Promise<void> {
   registerHealthRoutes(app);
   registerTerminalRoutes(app, config.TMUX_CONF_PATH);
   registerSessionRoutes(app);
+  registerSearchRoutes(app, config.TMUX_CONF_PATH);
   registerWsAttachRoute(app, config.TMUX_CONF_PATH);
 
   const shutdown = async (signal: string) => {

apps/booterm/src/pty/registry.ts

@@ -33,6 +33,7 @@ export function register(
 
 export function unregister(paneId: string): void {
   sessions.delete(paneId);
+  ringBuffers.delete(paneId);
 }
 
 export function list(): SessionMeta[] {
@@ -42,3 +43,120 @@ export function list(): SessionMeta[] {
 export function get(paneId: string): SessionMeta | undefined {
   return sessions.get(paneId);
 }
+
+// ── Ring buffer for PTY output search ──────────────────────────────────────
+
+export interface SearchMatch {
+  line: number;
+  content: string;
+  contextBefore: string[];
+  contextAfter: string[];
+}
+
+const ringBuffers = new Map<string, string[]>();
+
+/**
+ * Append raw PTY data to the ring buffer for a given pane.
+ * Splits incoming data on newlines and pushes each line into the buffer,
+ * trimming to `maxLines` (default 5000) from the tail.
+ */
+export function appendOutput(
+  paneId: string,
+  data: string,
+  maxLines: number = 5000,
+): void {
+  let buf = ringBuffers.get(paneId);
+  if (!buf) {
+    buf = [];
+    ringBuffers.set(paneId, buf);
+  }
+
+  // Split on newlines — each chunk may contain multiple complete lines and
+  // potentially a trailing partial line (which we store as-is; the next chunk
+  // will either complete it or be another partial).
+  const lines = data.split('\n');
+
+  // The first element of `lines` may be a continuation of the last partial
+  // line from the previous append. If the buffer is non-empty and the last
+  // stored entry is a partial (no trailing newline previously), glue them.
+  // We detect "partial" by checking whether `data` ended with '\n' — if it
+  // did, the last element after split is '' (empty) which we drop.
+  const endedWithNewline = data.endsWith('\n');
+  if (endedWithNewline) {
+    // The final empty-string element is discarded.
+    lines.pop();
+  }
+
+  if (buf.length > 0 && lines.length > 0) {
+    // Concatenate the last partial line in the buffer with the first split
+    // segment. This avoids splitting ANSI sequences or text across chunks.
+    buf[buf.length - 1] = (buf[buf.length - 1] ?? '') + (lines[0] ?? '');
+    lines.shift();
+  }
+
+  for (const line of lines) {
+    buf.push(line);
+  }
+
+  // Trim from head if over maxLines
+  if (buf.length > maxLines) {
+    buf = buf.slice(buf.length - maxLines);
+    ringBuffers.set(paneId, buf);
+  }
+}
+
+/**
+ * Search the ring buffer for a pane using a regex pattern.
+ * Returns matches with optional context lines before and after each match.
+ */
+export function searchRingBuffer(
+  paneId: string,
+  pattern: string,
+  opts?: { limit?: number; context?: number },
+): SearchMatch[] {
+  const buf = ringBuffers.get(paneId);
+  if (!buf || buf.length === 0) return [];
+
+  const limit = opts?.limit ?? 50;
+  const context = opts?.context ?? 0;
+
+  let re: RegExp;
+  try {
+    re = new RegExp(pattern, 'u');
+  } catch {
+    return []; // invalid regex — caller should validate, but be defensive
+  }
+
+  const results: SearchMatch[] = [];
+
+  for (let i = 0; i < buf.length; i++) {
+    if (results.length >= limit) break;
+    if (re.test(buf[i]!)) {
+      const contextBefore: string[] = [];
+      const contextAfter: string[] = [];
+      for (let c = 1; c <= context; c++) {
+        const ci = i - c;
+        if (ci >= 0) contextBefore.unshift(buf[ci]!);
+      }
+      for (let c = 1; c <= context; c++) {
+        const ci = i + c;
+        if (ci < buf.length) contextAfter.push(buf[ci]!);
+      }
+      results.push({
+        line: i + 1, // 1-based line number for display
+        content: buf[i]!,
+        contextBefore,
+        contextAfter,
+      });
+    }
+  }
+
+  return results;
+}
+
+/**
+ * Remove the ring buffer for a pane. Called on session kill / pane close.
+ */
+export function clearBuffer(paneId: string): void {
+  ringBuffers.delete(paneId);
+}

apps/booterm/src/routes/search.ts

@@ -0,0 +1,167 @@
+import type { FastifyInstance } from 'fastify';
+import { z } from 'zod';
+import { sanitizeId, tmuxSessionName, capturePane } from '../pty/manager.js';
+import { searchRingBuffer, clearBuffer } from '../pty/registry.js';
+
+const ParamsSchema = z.object({
+  sid: z.string(),
+  pid: z.string(),
+});
+
+const MAX_PATTERN_LENGTH = 200;
+
+// Zod-refined string: reject empty and overly-long patterns to prevent ReDoS
+const PatternQuerySchema = z
+  .string()
+  .min(1, 'pattern is required')
+  .max(MAX_PATTERN_LENGTH, `pattern must not exceed ${MAX_PATTERN_LENGTH} characters`);
+
+const QuerySchema = z.object({
+  pattern: PatternQuerySchema,
+  limit: z.coerce.number().int().min(1).max(500).default(50),
+  context: z.coerce.number().int().min(0).max(50).default(0),
+});
+
+interface SearchMatch {
+  line: number;
+  content: string;
+  contextBefore: string[];
+  contextAfter: string[];
+}
+
+interface SearchResponse {
+  matches: SearchMatch[];
+  total: number;
+  truncated: boolean;
+  source: 'ring' | 'capture';
+}
+
+/**
+ * Search a captured pane buffer using a regex. This is the fallback path
+ * when the ring buffer doesn't have enough matches.
+ */
+function grepBuffer(
+  text: string,
+  pattern: string,
+  limit: number,
+  context: number,
+): SearchMatch[] {
+  let re: RegExp;
+  try {
+    re = new RegExp(pattern, 'u');
+  } catch {
+    return [];
+  }
+
+  const lines = text.split('\n');
+  const results: SearchMatch[] = [];
+
+  for (let i = 0; i < lines.length; i++) {
+    if (results.length >= limit) break;
+    if (re.test(lines[i]!)) {
+      const contextBefore: string[] = [];
+      const contextAfter: string[] = [];
+      for (let c = 1; c <= context; c++) {
+        const ci = i - c;
+        if (ci >= 0) contextBefore.unshift(lines[ci]!);
+      }
+      for (let c = 1; c <= context; c++) {
+        const ci = i + c;
+        if (ci < lines.length) contextAfter.push(lines[ci]!);
+      }
+      results.push({
+        line: i + 1,
+        content: lines[i]!,
+        contextBefore,
+        contextAfter,
+      });
+    }
+  }
+
+  return results;
+}
+
+export function registerSearchRoutes(app: FastifyInstance, tmuxConfPath: string): void {
+  app.get<{
+    Params: { sid: string; pid: string };
+    Querystring: { pattern?: string; limit?: string; context?: string };
+  }>(
+    '/api/term/sessions/:sid/panes/:pid/search',
+    async (req, reply) => {
+      const p = ParamsSchema.safeParse(req.params);
+      if (!p.success) return reply.code(400).send({ error: 'bad_params' });
+
+      const sid = sanitizeId(p.data.sid);
+      const pid = sanitizeId(p.data.pid);
+      if (!sid || !pid) return reply.code(400).send({ error: 'bad_id_format' });
+
+      const q = QuerySchema.safeParse(req.query);
+      if (!q.success) {
+        return reply.code(400).send({
+          error: 'bad_query',
+          details: q.error.flatten().fieldErrors,
+        });
+      }
+
+      const { pattern, limit, context } = q.data;
+
+      // ── Path 1: ring buffer search (fast, no tmux interaction) ──
+      const ringMatches = searchRingBuffer(pid, pattern, { limit, context });
+      if (ringMatches.length >= limit) {
+        return reply.code(200).send({
+          matches: ringMatches,
+          total: ringMatches.length,
+          truncated: ringMatches.length >= limit,
+          source: 'ring' as const,
+        });
+      }
+
+      // ── Path 2: capture-pane + grep fallback (10s timeout) ──
+      const sessionName = tmuxSessionName(pid);
+
+      let capture: string;
+      try {
+        capture = await withTimeout(
+          capturePane(tmuxConfPath, sessionName, 5000),
+          10_000,
+        );
+      } catch (err) {
+        req.log.warn({ err, pid }, 'capture-pane timed out or failed');
+        return reply.code(200).send({
+          matches: ringMatches,
+          total: ringMatches.length,
+          truncated: false,
+          source: 'ring' as const,
+        });
+      }
+
+      if (!capture) {
+        // tmux pane may no longer exist — return whatever ring had
+        return reply.code(200).send({
+          matches: ringMatches,
+          total: ringMatches.length,
+          truncated: false,
+          source: 'ring' as const,
+        });
+      }
+
+      const captureMatches = grepBuffer(capture, pattern, limit, context);
+
+      return reply.code(200).send({
+        matches: captureMatches,
+        total: captureMatches.length,
+        truncated: captureMatches.length >= limit,
+        source: 'capture' as const,
+      });
+    },
+  );
+}
+
+function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T> {
+  return Promise.race([
+    promise,
+    new Promise<never>((_, reject) =>
+      setTimeout(() => reject(new Error('timeout')), ms),
+    ),
+  ]);
+}

apps/booterm/src/ws/attach.ts

@@ -9,7 +9,7 @@ import {
 } from '../pty/manager.js';
 import { attachPty } from '../pty/pty.js';
 import { getUser } from '../auth.js';
-import { register, unregister } from '../pty/registry.js';
+import { register, unregister, appendOutput } from '../pty/registry.js';
 
 export function registerWsAttachRoute(app: FastifyInstance, tmuxConfPath: string): void {
   app.get<{
@@ -106,6 +106,8 @@ export function registerWsAttachRoute(app: FastifyInstance, tmuxConfPath: string
         } catch (err) {
           req.log.warn({ err }, 'ws send failed');
         }
+        // Feed the ring buffer for pattern-based search
+        appendOutput(pid, data);
       };
       handle.onData(onData);
 

apps/coder/src/conductor/types.ts

@@ -42,6 +42,14 @@ export type StepKind = 'agent' | 'code' | 'approval';
 
 export type TriggerRule = 'all_success' | 'one_success' | 'all_done';
 
+/** Possible statuses for a flow step (persisted in flow_steps.status). */
+export type StepStatus = 'pending' | 'running' | 'completed' | 'failed' | 'skipped' | 'cancelled' | 'timed_out';
+
+/** Retry policy for a step that times out. */
+export interface RetryConfig {
+  maxRetries: number;
+}
+
 export interface Step {
   /** unique id within the flow; other steps depend on it by this id */
   id: string;
@@ -59,6 +67,8 @@ export interface Step {
   run: (ctx: StepContext) => string | Promise<string>;
   /** optional guard — when it returns false the step is skipped (e.g. no repo) */
   when?: (ctx: StepContext) => boolean;
+  /** max retries on timeout (0 or unset = no retry) */
+  maxRetries?: number;
 }
 
 export interface Flow {

apps/coder/src/config.ts

@@ -52,6 +52,9 @@ const ConfigSchema = z.object({
   ORPHAN_WORKTREE_GRACE_MS: z.coerce.number().int().positive().default(3_600_000),
   DEEPSEEK_API_KEY: z.string().optional(),
   DEEPSEEK_BASE_URL: z.string().url().default('https://api.deepseek.com'),
+  // v2.9.x: flow step timeout (default 5 min). When a 'running' step exceeds
+  // this duration, it is marked 'timed_out' and may be retried.
+  FLOW_STEP_TIMEOUT_MS: z.coerce.number().int().positive().default(300_000),
 });
 
 export type Config = z.infer<typeof ConfigSchema>;

apps/coder/src/schema.sql

@@ -266,7 +266,7 @@ CREATE INDEX IF NOT EXISTS claude_session_entries_key_idx ON claude_session_entr
 -- replaces it with the three-value list).
 ALTER TABLE agent_sessions DROP CONSTRAINT IF EXISTS agent_sessions_backend_chk;
 ALTER TABLE agent_sessions ADD CONSTRAINT agent_sessions_backend_chk
-  CHECK (backend IN ('opencode_server', 'acp_warm', 'claude_sdk'));
+  CHECK (backend IN ('opencode_server', 'acp_warm', 'claude_sdk', 'paseo'));
 
 -- LISTEN/NOTIFY fast path: every tasks INSERT (from any call site — routes,
 -- new_task tool, MCP server) fires pg_notify('tasks_new') in the same
@@ -340,11 +340,12 @@ CREATE INDEX IF NOT EXISTS flow_steps_task_id_idx ON flow_steps(task_id);
 -- edits above are no-ops on the existing DB (CREATE TABLE IF NOT EXISTS skips an
 -- existing table) — widen via the repo's DROP-IF-EXISTS → guarded-ADD discipline.
 -- Pure ADD of a new allowed value, so no row UPDATE is needed (no value renamed).
+-- v2.9.x: widen status CHECKs to include 'timed_out' for Task State Machine.
 ALTER TABLE flow_runs DROP CONSTRAINT IF EXISTS flow_runs_status_chk;
 DO $$ BEGIN
   IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'flow_runs_status_chk') THEN
     ALTER TABLE flow_runs ADD CONSTRAINT flow_runs_status_chk
-      CHECK (status IN ('running', 'completed', 'failed', 'cancelled'));
+      CHECK (status IN ('running', 'completed', 'failed', 'cancelled', 'timed_out'));
   END IF;
 END $$;
 
@@ -352,10 +353,14 @@ ALTER TABLE flow_steps DROP CONSTRAINT IF EXISTS flow_steps_status_chk;
 DO $$ BEGIN
   IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'flow_steps_status_chk') THEN
     ALTER TABLE flow_steps ADD CONSTRAINT flow_steps_status_chk
-      CHECK (status IN ('pending', 'running', 'completed', 'failed', 'skipped', 'cancelled'));
+      CHECK (status IN ('pending', 'running', 'completed', 'failed', 'skipped', 'cancelled', 'timed_out'));
   END IF;
 END $$;
 
+-- Task State Machine: retry columns for flow_steps.
+ALTER TABLE flow_steps ADD COLUMN IF NOT EXISTS retry_count INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE flow_steps ADD COLUMN IF NOT EXISTS max_retries INTEGER;
+
 -- Arena: battles + contestants + cross_examinations.
 -- project_id carries no FK (matches tasks.project_id + flow_runs.project_id convention).
 -- winner_contestant_id FK is deferred (forward reference): added via guarded ALTER below.

apps/coder/src/services/__tests__/flow-runner-decisions.test.ts

@@ -52,6 +52,7 @@ const emptyState = (over: Partial<SchedulerState> = {}): SchedulerState => ({
   skipped: new Set(),
   inFlight: new Set(),
   excluded: new Set(),
+  timedOut: new Set(),
   ...over,
 });
 

apps/coder/src/services/__tests__/paseo-client.test.ts

@@ -0,0 +1,195 @@
+import { describe, it, expect, vi } from 'vitest';
+import { PaseoClient, PaseoClientError } from '../paseo-client.js';
+
+/**
+ * Create a PaseoClient whose runCli method is replaced with a mock.
+ * The mock is returned as the second tuple element so tests can
+ * control and inspect it directly.
+ */
+function makeClient(config?: { paseoBin?: string; cliHost?: string }): {
+  client: PaseoClient;
+  mockRunCli: ReturnType<typeof vi.fn>;
+} {
+  const client = new PaseoClient(config);
+  const mockRunCli = vi.fn();
+  (client as any).runCli = mockRunCli;
+  return { client, mockRunCli };
+}
+
+describe('PaseoClient', () => {
+  describe('listAgents', () => {
+    it('returns parsed agent list from paseo ls --json', async () => {
+      const agents = [
+        { id: 'abc-123', shortId: 'abc', name: 'Agent 1', provider: 'opencode', status: 'running' },
+        { id: 'def-456', shortId: 'def', name: 'Agent 2', provider: 'claude', status: 'idle' },
+      ];
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue(JSON.stringify(agents));
+
+      const result = await client.listAgents();
+
+      expect(mockRunCli).toHaveBeenCalledWith(['ls', '--json']);
+      expect(result).toEqual(agents);
+    });
+
+    it('throws PaseoClientError on non-JSON output', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('not json');
+
+      await expect(client.listAgents()).rejects.toThrow(PaseoClientError);
+      await expect(client.listAgents()).rejects.toThrow(/invalid JSON/);
+    });
+
+    it('propagates runCli rejection as-is', async () => {
+      const { client, mockRunCli } = makeClient();
+      const err = new PaseoClientError('ls failed: connection refused', 'ls', 1, 'connection refused');
+      mockRunCli.mockRejectedValue(err);
+
+      await expect(client.listAgents()).rejects.toThrow(PaseoClientError);
+      await expect(client.listAgents()).rejects.toThrow(/ls failed/);
+    });
+  });
+
+  describe('getAgentStatus', () => {
+    it('returns parsed agent detail from paseo inspect --json', async () => {
+      const detail = {
+        Id: 'abc-123', Name: 'Agent 1', Provider: 'opencode',
+        Status: 'idle', Archived: false,
+        CreatedAt: '2026-01-01T00:00:00Z', UpdatedAt: '2026-01-01T01:00:00Z',
+      };
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue(JSON.stringify(detail));
+
+      const result = await client.getAgentStatus('abc-123');
+
+      expect(mockRunCli).toHaveBeenCalledWith(['inspect', '--json', 'abc-123']);
+      expect(result.Id).toBe('abc-123');
+      expect(result.Status).toBe('idle');
+    });
+  });
+
+  describe('health', () => {
+    it('returns ok when paseo ls succeeds', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('[]');
+
+      const result = await client.health();
+
+      expect(result).toEqual({ status: 'ok' });
+    });
+
+    it('returns error when runCli throws', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockRejectedValue(new Error('connection refused'));
+
+      const result = await client.health();
+
+      expect(result).toEqual({ status: 'error' });
+    });
+  });
+
+  describe('importAgent', () => {
+    it('calls paseo import with provider and labels', async () => {
+      const agentResult = { Id: 'new-789', Name: 'Imported', Provider: 'opencode', Status: 'idle' };
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue(JSON.stringify(agentResult));
+
+      const result = await client.importAgent('ses-001', 'opencode', {
+        origin: 'boocode',
+        project: 'proj-1',
+      });
+
+      expect(mockRunCli).toHaveBeenCalledWith([
+        'import', '--json',
+        '--provider', 'opencode',
+        '--label', 'origin=boocode',
+        '--label', 'project=proj-1',
+        'ses-001',
+      ]);
+      expect(result.Id).toBe('new-789');
+    });
+
+    it('works without labels', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue(JSON.stringify({ Id: 'new-789' }));
+
+      const result = await client.importAgent('ses-001', 'claude');
+
+      expect(mockRunCli).toHaveBeenCalledWith([
+        'import', '--json',
+        '--provider', 'claude',
+        'ses-001',
+      ]);
+      expect(result.Id).toBe('new-789');
+    });
+  });
+
+  describe('archiveAgent', () => {
+    it('calls paseo archive --json', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('{}');
+
+      await client.archiveAgent('abc-123');
+
+      expect(mockRunCli).toHaveBeenCalledWith(['archive', '--json', 'abc-123']);
+    });
+  });
+
+  describe('sendPrompt', () => {
+    it('sends prompt and parses JSON result', async () => {
+      const sendResult = { text: 'Hello!', ok: true };
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue(JSON.stringify(sendResult));
+
+      const result = await client.sendPrompt('abc-123', 'Hello');
+
+      expect(mockRunCli).toHaveBeenCalledWith(['send', '--json', 'abc-123', 'Hello'], undefined);
+      expect(result).toEqual(sendResult);
+    });
+
+    it('falls back to plain text on non-JSON output', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('plain text response');
+
+      const result = await client.sendPrompt('abc-123', 'Hi');
+
+      expect(result).toEqual({ text: 'plain text response', ok: true });
+    });
+
+    it('supports --no-wait flag', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('{}');
+
+      await client.sendPrompt('abc-123', 'Hi', { noWait: true });
+
+      expect(mockRunCli).toHaveBeenCalledWith([
+        'send', '--json', '--no-wait',
+        'abc-123', 'Hi',
+      ], undefined);
+    });
+  });
+
+  describe('stopAgent', () => {
+    it('calls paseo stop', async () => {
+      const { client, mockRunCli } = makeClient();
+      mockRunCli.mockResolvedValue('');
+
+      await client.stopAgent('abc-123');
+
+      expect(mockRunCli).toHaveBeenCalledWith(['stop', 'abc-123']);
+    });
+  });
+
+  describe('cliHost config', () => {
+    it('includes --host flag in args when cliHost is set', async () => {
+      const { client, mockRunCli } = makeClient({ cliHost: 'tcp://localhost:6767?ssl=true' });
+      mockRunCli.mockResolvedValue('[]');
+
+      await client.listAgents();
+
+      expect(mockRunCli).toHaveBeenCalledWith([
+        'ls', '--json', '--host', 'tcp://localhost:6767?ssl=true',
+      ]);
+    });
+  });
+});

apps/coder/src/services/agent-backend.ts

@@ -13,7 +13,7 @@ import type { AcpToolSnapshot } from './acp-tool-snapshot.js';
 import type { AgentCommand } from './provider-types.js';
 
 /** Backend transport kind. Mirrors `agent_sessions.backend` CHECK in schema.sql. */
-export type AgentBackendKind = 'opencode_server' | 'acp_warm' | 'claude_sdk';
+export type AgentBackendKind = 'opencode_server' | 'acp_warm' | 'claude_sdk' | 'paseo';
 
 /**
  * Normalized, transport-agnostic events a backend emits during a turn (§2).

apps/coder/src/services/backends/paseo.ts

@@ -0,0 +1,254 @@
+/**
+ * v2.10 — PaseoBackend: Paseo agent integration for the agent-pool.
+ *
+ * Wraps the Paseo CLI daemon as an AgentBackend. Each Paseo agent maps to one
+ * (chat_id, agent) pair and is persisted via `paseo import` (which registers
+ * an agent with the Paseo daemon). Prompts are sent via `paseo send`, and
+ * the session is cleaned up via `paseo archive`.
+ *
+ * Paseo is a meta-agent hub — it wraps provider sessions (opencode, claude,
+ * acp, etc.). The `provider` option in `EnsureSessionOpts` selects which
+ * provider Paseo delegates to.
+ *
+ * Backend kind: 'paseo' (must be added to agent_sessions_backend_chk).
+ *
+ * Spec: openspec/changes/v2-10-paseo-integration/design.md.
+ */
+import type { FastifyBaseLogger } from 'fastify';
+import type { Sql } from '../../db.js';
+import { PaseoClient, type PaseoSendResult } from '../paseo-client.js';
+import type {
+  AgentBackend,
+  AgentSessionHandle,
+  EnsureSessionOpts,
+  PromptCtx,
+  TurnResult,
+} from '../agent-backend.js';
+
+/** Default provider to use when Paseo wraps a generic agent. */
+const DEFAULT_PASEO_PROVIDER = 'opencode';
+
+export interface PaseoBackendDeps {
+  sql: Sql;
+  log: FastifyBaseLogger;
+  /** The (chat, agent) this backend serves — its pool identity + DB key. */
+  chatId: string;
+  /** Agent name (e.g. 'opencode', 'claude', 'paseo'). */
+  agent: string;
+  /** Resolved PaseoClient instance. */
+  client: PaseoClient;
+  /** Provider string to pass to `paseo import --provider`. */
+  provider: string;
+}
+
+export class PaseoBackend implements AgentBackend {
+  readonly backend = 'paseo' as const;
+
+  private readonly sql: Sql;
+  private readonly log: FastifyBaseLogger;
+  private readonly chatId: string;
+  private readonly agent: string;
+  private readonly client: PaseoClient;
+  private readonly provider: string;
+
+  /** Map of BooCode sessionId → Paseo agent ID. */
+  private readonly agentIds = new Map<string, string>();
+  /** True between prompt() start and settle. */
+  private busy = false;
+  private up = false;
+
+  constructor(deps: PaseoBackendDeps) {
+    this.sql = deps.sql;
+    this.log = deps.log;
+    this.chatId = deps.chatId;
+    this.agent = deps.agent;
+    this.client = deps.client;
+    this.provider = deps.provider || DEFAULT_PASEO_PROVIDER;
+  }
+
+  /** §2: liveness for the health endpoint + dispatcher fallback decision. */
+  health(): 'up' | 'down' {
+    return this.up ? 'up' : 'down';
+  }
+
+  /** Phase 3: busy iff a turn is in flight (pool never evicts a busy backend). */
+  isBusy(): boolean {
+    return this.busy;
+  }
+
+  // ─── ensureSession: create/import a Paseo agent ─────────────────────────────
+
+  async ensureSession(sessionId: string, opts: EnsureSessionOpts): Promise<AgentSessionHandle> {
+    // Check if we already have a Paseo agent ID for this session.
+    let paseoId = this.agentIds.get(sessionId);
+
+    if (!paseoId) {
+      // Resolve existing agent_session_id from DB (e.g. after a restart).
+      const [row] = await this.sql<{ agent_session_id: string | null }[]>`
+        SELECT agent_session_id FROM agent_sessions
+        WHERE chat_id = ${opts.chatId} AND agent = ${opts.agent} AND backend = 'paseo'
+      `;
+      if (row?.agent_session_id) {
+        paseoId = row.agent_session_id;
+        this.agentIds.set(sessionId, paseoId);
+      }
+    }
+
+    if (!paseoId) {
+      // Import a new Paseo agent. Use the session UUID as the provider session id.
+      const labels: Record<string, string> = {
+        origin: 'boocode',
+        project: opts.projectId,
+        chat: opts.chatId,
+        worktree: opts.worktreeId,
+        agent: this.agent,
+      };
+
+      try {
+        const agent = await this.client.importAgent(sessionId, this.provider, labels);
+        paseoId = agent.Id;
+        this.agentIds.set(sessionId, paseoId);
+        this.log.info(
+          { paseoId, agent: this.agent, chatId: this.chatId },
+          'paseo: imported agent',
+        );
+      } catch (err) {
+        this.log.error(
+          { err: String(err), agent: this.agent, chatId: this.chatId },
+          'paseo: importAgent failed',
+        );
+        throw err;
+      }
+    }
+
+    // Upsert the agent_sessions row.
+    await this.sql`
+      INSERT INTO agent_sessions
+        (chat_id, session_id, worktree_id, agent, backend, agent_session_id, server_port, status, last_active_at)
+      VALUES
+        (${opts.chatId}, ${sessionId}, ${opts.worktreeId}, ${opts.agent}, 'paseo', ${paseoId}, NULL, 'active', clock_timestamp())
+      ON CONFLICT (chat_id, agent) DO UPDATE SET
+        session_id = EXCLUDED.session_id,
+        worktree_id = EXCLUDED.worktree_id,
+        backend = 'paseo',
+        agent_session_id = COALESCE(EXCLUDED.agent_session_id, agent_sessions.agent_session_id),
+        server_port = NULL,
+        status = 'active',
+        last_active_at = clock_timestamp()
+    `.catch((err) => {
+      this.log.warn(
+        { err: String(err), chatId: opts.chatId, agent: opts.agent },
+        'paseo: agent_sessions upsert failed (non-fatal)',
+      );
+    });
+
+    this.up = true;
+
+    return {
+      sessionId,
+      agent: opts.agent,
+      backend: 'paseo',
+      chatId: opts.chatId,
+      worktreeId: opts.worktreeId,
+      agentSessionId: paseoId,
+      serverPort: null,
+    };
+  }
+
+  // ─── prompt: send a message to the Paseo agent ─────────────────────────────
+
+  async prompt(handle: AgentSessionHandle, input: string, ctx: PromptCtx): Promise<TurnResult> {
+    const paseoId = handle.agentSessionId;
+    if (!paseoId) {
+      return { ok: false, error: 'paseo: no agent session id in handle' };
+    }
+
+    this.busy = true;
+    try {
+      // Use streamSend for real-time text output via onEvent.
+      const result: PaseoSendResult = await this.client.streamSend(
+        paseoId,
+        input,
+        (event) => {
+          ctx.onEvent(event);
+        },
+        ctx.signal,
+      );
+
+      // Update last_active_at.
+      await this.sql`
+        UPDATE agent_sessions
+        SET last_active_at = clock_timestamp()
+        WHERE chat_id = ${handle.chatId} AND agent = ${handle.agent}
+      `.catch(() => { /* non-fatal */ });
+
+      if (result.error) {
+        return { ok: false, error: result.error };
+      }
+
+      return { ok: true };
+    } catch (err) {
+      const msg = err instanceof Error ? err.message : String(err);
+      // Check if abortion
+      if (ctx.signal.aborted) {
+        return { ok: false, error: 'cancelled' };
+      }
+      return { ok: false, error: `paseo: ${msg}` };
+    } finally {
+      this.busy = false;
+    }
+  }
+
+  // ─── closeSession: archive the Paseo agent ─────────────────────────────────
+
+  async closeSession(handle: AgentSessionHandle): Promise<void> {
+    const paseoId = handle.agentSessionId;
+    if (!paseoId) return;
+
+    try {
+      await this.client.archiveAgent(paseoId);
+      this.log.info({ paseoId, agent: handle.agent }, 'paseo: archived agent');
+    } catch (err) {
+      this.log.warn(
+        { err: String(err), paseoId, agent: handle.agent },
+        'paseo: archiveAgent failed (non-fatal)',
+      );
+    }
+
+    this.agentIds.delete(handle.sessionId);
+
+    // Update DB row.
+    await this.sql`
+      UPDATE agent_sessions
+      SET status = 'closed', last_active_at = clock_timestamp()
+      WHERE chat_id = ${handle.chatId} AND agent = ${handle.agent}
+    `.catch(() => { /* non-fatal */ });
+  }
+
+  // ─── dispose: archive all tracked agents ───────────────────────────────────
+
+  async dispose(): Promise<void> {
+    const ids = [...this.agentIds.values()];
+    this.agentIds.clear();
+
+    for (const paseoId of ids) {
+      try {
+        await this.client.archiveAgent(paseoId);
+      } catch {
+        // Best-effort cleanup during shutdown.
+      }
+    }
+
+    this.up = false;
+  }
+
+  /** Phase 3: periodic health tick — probes the Paseo daemon. */
+  async tickHealth(_now?: number): Promise<void> {
+    try {
+      const h = await this.client.health();
+      this.up = h.status === 'ok';
+    } catch {
+      this.up = false;
+    }
+  }
+}

apps/coder/src/services/collision-detector.ts

@@ -0,0 +1,115 @@
+// v2.8 Collision detection — pure functions that find file overlaps between
+// worktrees/agents editing the same files concurrently. Advisory only; writes
+// are never blocked, but the collision info surfaces in the UI and logs.
+//
+// Severity levels:
+//   same_line     — the same file, exact same line region
+//   adjacent_line — the same file, lines touch or are within 5 lines
+//   different_area — the same file, distant lines
+//
+// Pure functions, no side effects. Testable in isolation.
+
+export type ConflictSeverity = 'same_line' | 'adjacent_line' | 'different_area';
+
+export interface ConflictVerdict {
+  filePath: string;
+  worktrees: string[];
+  severity: ConflictSeverity;
+  agents: string[];
+}
+
+/**
+ * Registry entry for a single file change recorded by a worktree.
+ * Stored in the ConflictIndex Map value for each file path.
+ */
+export interface ConflictEntry {
+  worktreeId: string;
+  agent: string;
+  /**
+   * Approximate line range touched by the change. undefined when the change
+   * creates or deletes the file (full-file collision vs. same-line).
+   */
+  lineRange?: { start: number; end: number };
+  status: 'pending' | 'applied' | 'reverted';
+  timestamp: number;
+}
+
+/**
+ * Shape of the conflict index consumed by findConflicts.
+ * File path → set of entries from different worktrees/agents.
+ */
+export type ConflictIndexData = ReadonlyMap<string, ReadonlySet<ConflictEntry>>;
+
+/**
+ * Find file overlaps between `changedFiles` and the conflict index, excluding
+ * the caller's own worktree.
+ *
+ * Returns one ConflictVerdict per file that has entries from other worktrees.
+ * Severity is the highest found (same_line > adjacent_line > different_area).
+ */
+export function findConflicts(
+  changedFiles: string[],
+  worktreeId: string,
+  /** Approximate line range for the proposed changes, keyed by file path */
+  changedRanges: Map<string, { start: number; end: number }>,
+  conflictIndex: ConflictIndexData,
+): ConflictVerdict[] {
+  const verdicts: ConflictVerdict[] = [];
+
+  for (const filePath of changedFiles) {
+    const entries = conflictIndex.get(filePath);
+    if (!entries || entries.size === 0) continue;
+
+    // Filter to entries from OTHER worktrees
+    const otherEntries = [...entries].filter((e) => e.worktreeId !== worktreeId);
+    if (otherEntries.length === 0) continue;
+
+    const myRange = changedRanges.get(filePath);
+    let severity: ConflictSeverity = 'different_area';
+
+    for (const entry of otherEntries) {
+      if (!myRange || !entry.lineRange) {
+        // Full-file changes (create/delete) always hit at least different_area
+        continue;
+      }
+      const sev = lineOverlapSeverity(myRange, entry.lineRange);
+      if (sev === 'same_line') {
+        severity = 'same_line';
+        break; // Can't get higher than this
+      }
+      if (sev === 'adjacent_line' && severity === 'different_area') {
+        severity = 'adjacent_line';
+      }
+    }
+
+    const worktrees = [...new Set(otherEntries.map((e) => e.worktreeId))];
+    const agents = [...new Set(otherEntries.map((e) => e.agent))];
+
+    verdicts.push({ filePath, worktrees, severity, agents });
+  }
+
+  return verdicts;
+}
+
+const ADJACENT_LINE_THRESHOLD = 5;
+
+/**
+ * Determine severity of overlap between two line ranges.
+ */
+function lineOverlapSeverity(
+  a: { start: number; end: number },
+  b: { start: number; end: number },
+): ConflictSeverity {
+  // Same_line: ranges intersect
+  if (a.start <= b.end && b.start <= a.end) {
+    return 'same_line';
+  }
+
+  // Adjacent: ranges are within ADJACENT_LINE_THRESHOLD lines of each other
+  const gap = a.start > b.end ? a.start - b.end : b.start - a.end;
+  if (gap <= ADJACENT_LINE_THRESHOLD) {
+    return 'adjacent_line';
+  }
+
+  return 'different_area';
+}

apps/coder/src/services/conflict-index.ts

@@ -0,0 +1,151 @@
+// v2.8 In-memory conflict index — tracks which worktrees/agents are editing
+// which files so the collision detector can find overlaps.
+//
+// Singleton exported as `conflictIndex`; imported by pending_changes.ts to
+// register changes at queue time and unregister on worktree teardown.
+//
+// NOT persisted — survives only as long as the BooCoder process. Postgres
+// is the durable record (pending_changes table); this is the hot in-memory
+// probe for concurrent edit warnings.
+
+import type { ConflictEntry, ConflictVerdict } from './collision-detector.js';
+import { findConflicts } from './collision-detector.js';
+
+export class ConflictIndex {
+  /**
+   * filePath → Set of ConflictEntry from various worktrees.
+   * A single worktree may have multiple entries for the same file
+   * (several pending edits to the same file in one session).
+   */
+  #map = new Map<string, Set<ConflictEntry>>();
+
+  // ---- mutation -------------------------------------------------------
+
+  /**
+   * Register that `worktreeId` (agent) is touching `filePath`.
+   * Creates an entry in the index so subsequent callers see it as a conflict.
+   */
+  registerChange(
+    filePath: string,
+    worktreeId: string,
+    agent: string,
+    lineRange?: { start: number; end: number },
+  ): void {
+    let entries = this.#map.get(filePath);
+    if (!entries) {
+      entries = new Set();
+      this.#map.set(filePath, entries);
+    }
+    entries.add({
+      worktreeId,
+      agent,
+      lineRange,
+      status: 'pending' as const,
+      timestamp: Date.now(),
+    });
+  }
+
+  /**
+   * Remove all entries for a given worktree. Called on worktree teardown
+   * so stale entries don't trigger false warnings.
+   */
+  removeWorktree(worktreeId: string): void {
+    for (const [filePath, entries] of this.#map) {
+      const before = entries.size;
+      for (const entry of entries) {
+        if (entry.worktreeId === worktreeId) {
+          entries.delete(entry);
+        }
+      }
+      if (entries.size === 0) {
+        this.#map.delete(filePath);
+      }
+    }
+  }
+
+  /**
+   * Remove entries older than `maxAgeMs`. Useful as a periodic cleanup
+   * when worktree teardown was missed (crash, unclean exit).
+   */
+  sweepStale(maxAgeMs: number): number {
+    const cutoff = Date.now() - maxAgeMs;
+    let removed = 0;
+
+    for (const [filePath, entries] of this.#map) {
+      for (const entry of entries) {
+        if (entry.timestamp < cutoff) {
+          entries.delete(entry);
+          removed++;
+        }
+      }
+      if (entries.size === 0) {
+        this.#map.delete(filePath);
+      }
+    }
+
+    return removed;
+  }
+
+  // ---- query ----------------------------------------------------------
+
+  /**
+   * Query the raw ConflictEntry set for a file path. Returns empty set
+   * when there are no entries (never mutated the file).
+   */
+  getEntriesFor(filePath: string): ReadonlySet<ConflictEntry> {
+    return this.#map.get(filePath) ?? new Set();
+  }
+
+  /**
+   * Get all conflict verdicts for a given file path — which other
+   * worktrees are touching it. Returns empty when only one worktree
+   * has entries (no actual conflict).
+   */
+  getConflictsFor(filePath: string): ConflictVerdict[] {
+    const entries = this.#map.get(filePath);
+    if (!entries || entries.size === 0) return [];
+
+    // Determine distinct worktree IDs. If only one, no conflict.
+    const worktreeIds = new Set<string>();
+    for (const e of entries) worktreeIds.add(e.worktreeId);
+    if (worktreeIds.size <= 1) return [];
+
+    // Use the first worktree as the "caller" so findConflicts excludes
+    // its entries and returns only entries from OTHER worktrees.
+    const caller = [...worktreeIds][0]!;
+    return findConflicts(
+      [filePath],
+      caller,
+      new Map(),
+      this.#toIndexData(),
+    );
+  }
+
+  /**
+   * Get conflicts for a set of file changes from a specific worktree.
+   * Delegates to the pure findConflicts function.
+   */
+  query(
+    changedFiles: string[],
+    worktreeId: string,
+    changedRanges: Map<string, { start: number; end: number }>,
+  ): ConflictVerdict[] {
+    return findConflicts(changedFiles, worktreeId, changedRanges, this.#toIndexData());
+  }
+
+  /**
+   * Snapshot the current map for testing/inspection.
+   */
+  snapshot(): Map<string, ReadonlySet<ConflictEntry>> {
+    return new Map(this.#map);
+  }
+
+  // ---- private --------------------------------------------------------
+
+  #toIndexData(): ReadonlyMap<string, ReadonlySet<ConflictEntry>> {
+    return this.#map as ReadonlyMap<string, ReadonlySet<ConflictEntry>>;
+  }
+}
+
+// Singleton — the whole BooCoder process shares one conflict index.
+export const conflictIndex = new ConflictIndex();

apps/coder/src/services/flow-runner-decisions.ts

@@ -33,11 +33,13 @@ export interface SchedulerState {
   readonly inFlight: ReadonlySet<string>;
   /** step ids pre-skipped at launch (band/when gating) — never given a row */
   readonly excluded: ReadonlySet<string>;
+  /** step ids that timed out (terminal — no retries remaining or not retriable) */
+  readonly timedOut: ReadonlySet<string>;
 }
 
-/** A dependency is satisfied once it is done, skipped, or excluded. */
+/** A dependency is satisfied once it is done, skipped, excluded, or timed out. */
 function isSatisfied(state: SchedulerState, id: string): boolean {
-  return state.done.has(id) || state.skipped.has(id) || state.excluded.has(id);
+  return state.done.has(id) || state.skipped.has(id) || state.excluded.has(id) || state.timedOut.has(id);
 }
 
 /**
@@ -118,12 +120,29 @@ export function isStuck(flow: Flow, state: SchedulerState): boolean {
  * - 'mark-cancelled': task was cancelled before the callback ran; propagate so
  *                     advance() cancels the run.
  */
+/**
+ * True when the step definition allows retries on timeout.
+ * Pure — no IO.
+ */
+export function isRetriable(step: { maxRetries?: number }): boolean {
+  return (step.maxRetries ?? 0) > 0;
+}
+
+/**
+ * True when the step has retries remaining.
+ * Pure — no IO.
+ */
+export function shouldRetry(maxRetries: number | undefined | null, retryCount: number): boolean {
+  return retryCount < (maxRetries ?? 0);
+}
+
 export type ResumeAction =
   | 'keep'
   | 're-dispatch'
   | 'mark-done'
   | 'mark-failed'
-  | 'mark-cancelled';
+  | 'mark-cancelled'
+  | 'retry';
 
 /**
  * Decide what to do with ONE flow step during startup resume (D-9). Pure.
@@ -131,12 +150,20 @@ export type ResumeAction =
  * @param status     - flow_steps.status
  * @param taskId     - flow_steps.task_id (null for code steps or unstarted agent steps)
  * @param taskState  - tasks.state for taskId, or null if the task row is absent
+ * @param retryCount - flow_steps.retry_count (default 0)
+ * @param maxRetries - flow_steps.max_retries (null = no retry)
  */
 export function reconcileResumeStep(
   status: string,
   taskId: string | null,
   taskState: string | null,
+  retryCount?: number,
+  maxRetries?: number | null,
 ): ResumeAction {
+  if (status === 'timed_out') {
+    if (shouldRetry(maxRetries, retryCount ?? 0)) return 'retry';
+    return 'mark-failed';
+  }
   if (status !== 'running') return 'keep';
   // Running step: decide by its task's current state.
   if (!taskId || taskState === null) return 're-dispatch'; // task gone or never created
@@ -198,7 +225,7 @@ export function evaluateTriggerRule(
  * decision per step. Pure — no IO.
  */
 export function reconcileRun(
-  steps: ReadonlyArray<{ stepId: string; taskId: string | null; status: string }>,
+  steps: ReadonlyArray<{ stepId: string; taskId: string | null; status: string; retryCount?: number; maxRetries?: number | null }>,
   taskStates: ReadonlyMap<string, string>,
 ): StepResumeDecision[] {
   return steps.map((step) => ({
@@ -207,6 +234,8 @@ export function reconcileRun(
       step.status,
       step.taskId,
       step.taskId ? (taskStates.get(step.taskId) ?? null) : null,
+      step.retryCount,
+      step.maxRetries,
     ),
   }));
 }

apps/coder/src/services/flow-runner.ts

@@ -100,6 +100,9 @@ interface FlowStepRow {
   status: string;
   chat_id: string | null;
   output: string | null;
+  updated_at: string | null;
+  retry_count: number | null;
+  max_retries: number | null;
 }
 
 export function createFlowRunner(deps: Deps): FlowRunner {
@@ -263,7 +266,8 @@ export function createFlowRunner(deps: Deps): FlowRunner {
     const dispatch: DispatchFn = (agent, task) => dispatchSubAgent(run.project_id, model, agent, task);
 
     const rows = await sql<FlowStepRow[]>`
-      SELECT step_id, kind, agent, status, chat_id, output FROM flow_steps WHERE run_id = ${runId}
+      SELECT step_id, kind, agent, status, chat_id, output, updated_at, retry_count, max_retries
+      FROM flow_steps WHERE run_id = ${runId}
     `;
 
     // Re-derive the excluded set (band/when pre-skips) from the flow def + input —
@@ -275,6 +279,7 @@ export function createFlowRunner(deps: Deps): FlowRunner {
     const done = new Set<string>();
     const skipped = new Set<string>();
     const inFlight = new Set<string>();
+    const timedOut = new Set<string>();
     const results: Record<string, string> = {};
     for (const r of rows) {
       switch (r.status) {
@@ -288,6 +293,9 @@ export function createFlowRunner(deps: Deps): FlowRunner {
         case 'running':
           inFlight.add(r.step_id);
           break;
+        case 'timed_out':
+          timedOut.add(r.step_id);
+          break;
         case 'failed':
           // A failed worker makes the deterministic report untrustworthy — fail the
           // whole run (matches the Phase-1 CLI, which throws on a dispatch failure).
@@ -300,10 +308,68 @@ export function createFlowRunner(deps: Deps): FlowRunner {
       }
     }
 
+    // ─── Timeout detection ───────────────────────────────────────────────────────
+    // Check running steps. If a step has been 'running' longer than
+    // FLOW_STEP_TIMEOUT_MS, mark it timed_out or re-dispatch if retriable.
+    const timeoutMs = config.FLOW_STEP_TIMEOUT_MS;
+    const nowDate = new Date();
+    let detectedTimedOut = false;
+    for (const r of rows) {
+      if (r.status !== 'running') continue;
+      if (!r.updated_at) continue;
+      const elapsed = nowDate.getTime() - new Date(r.updated_at).getTime();
+      if (elapsed <= timeoutMs) continue;
+
+      // Step has exceeded the timeout
+      detectedTimedOut = true;
+      const retryCount = r.retry_count ?? 0;
+      const maxRetries = r.max_retries ?? 0;
+
+      if (maxRetries > 0 && retryCount < maxRetries) {
+        // Retriable: re-dispatch the step with an incremented retry_count
+        const step = flow.steps.find((s) => s.id === r.step_id);
+        if (!step || step.kind !== 'agent') {
+          // Non-agent steps can't be retried via dispatch
+          inFlight.delete(r.step_id);
+          await failRun(runId, flow, input, model,
+            `step '${r.step_id}' timed out (non-retriable kind)`, r.step_id);
+          return;
+        }
+        inFlight.delete(r.step_id);
+        await sql`
+          UPDATE flow_steps
+          SET retry_count = ${retryCount + 1}, updated_at = clock_timestamp()
+          WHERE run_id = ${runId} AND step_id = ${r.step_id} AND status = 'running'
+        `;
+        await dispatchAgentStep(runId, run.project_id, model, step, ctx);
+        inFlight.add(r.step_id);
+        log.warn({ runId, stepId: r.step_id, retry: retryCount + 1, maxRetries },
+          'flow-runner: step timed out, retrying');
+      } else {
+        // Not retriable — mark as timed_out, fail the run
+        inFlight.delete(r.step_id);
+        await sql`
+          UPDATE flow_steps SET status = 'timed_out', updated_at = clock_timestamp()
+          WHERE run_id = ${runId} AND step_id = ${r.step_id} AND status = 'running'
+        `;
+        timedOut.add(r.step_id);
+        publishStep(runId, r.step_id, 'timed_out');
+        await failRun(runId, flow, input, model,
+          `step '${r.step_id}' timed out`, r.step_id);
+        return;
+      }
+    }
+
+    // If we modified any steps, re-query so the state sets reflect the latest DB.
+    if (detectedTimedOut) {
+      // Continue with the in-memory state we already adjusted above (inFlight/timedOut
+      // were mutated directly). No re-query needed.
+    }
+
     // Drain ready skips + code steps (synchronous), re-evaluating after each batch,
     // then dispatch the full ready agent wave and wait for their terminal callbacks.
     for (;;) {
-      const state: SchedulerState = { done, skipped, inFlight, excluded };
+      const state: SchedulerState = { done, skipped, inFlight, excluded, timedOut };
 
       if (isRunComplete(flow, state)) {
         await finishRun(runId, flow, input, results, model, dispatch);
@@ -545,7 +611,7 @@ export function createFlowRunner(deps: Deps): FlowRunner {
   function publishStep(
     runId: string,
     stepId: string,
-    status: 'running' | 'completed' | 'failed' | 'skipped' | 'cancelled' | 'blocked',
+    status: 'running' | 'completed' | 'failed' | 'skipped' | 'cancelled' | 'blocked' | 'timed_out',
     extra?: { run_status?: 'running' | 'completed' | 'failed' | 'cancelled'; report?: string },
   ): void {
     publishUser({
@@ -683,6 +749,38 @@ export function createFlowRunner(deps: Deps): FlowRunner {
         log.info({ runId, stepId: step.step_id, taskId: task!.id }, 'flow-runner: step re-dispatched on resume');
         break;
       }
+
+      case 'retry': {
+        // Like re-dispatch but increments retry_count and sets status to 'running'.
+        if (!step.input) {
+          await sql`
+            UPDATE flow_steps
+            SET status = 'failed', error = 'retry: no stored prompt',
+                updated_at = clock_timestamp()
+            WHERE run_id = ${runId} AND step_id = ${step.step_id}
+          `;
+          break;
+        }
+        const chatIdR = step.chat_id;
+        const [chatR] = chatIdR
+          ? await sql<{ session_id: string }[]>`SELECT session_id FROM chats WHERE id = ${chatIdR}`
+          : [];
+        const sessionIdR = chatR?.session_id ?? null;
+        const [taskR] = await sql<{ id: string }[]>`
+          INSERT INTO tasks (project_id, input, agent, model, mode_id, session_id, chat_id)
+          VALUES (${projectId}, ${step.input}, 'qwen', ${model}, 'plan', ${sessionIdR}, ${chatIdR})
+          RETURNING id
+        `;
+        await sql`
+          UPDATE flow_steps
+          SET task_id = ${taskR!.id}, retry_count = retry_count + 1, status = 'running',
+              updated_at = clock_timestamp()
+          WHERE run_id = ${runId} AND step_id = ${step.step_id}
+        `;
+        log.info({ runId, stepId: step.step_id, taskId: taskR!.id },
+          'flow-runner: step retried on resume');
+        break;
+      }
     }
   }
 
@@ -697,7 +795,9 @@ export function createFlowRunner(deps: Deps): FlowRunner {
       status: string;
       chat_id: string | null;
       input: string | null;
-    }[]>`SELECT step_id, task_id, status, chat_id, input FROM flow_steps WHERE run_id = ${run.id}`;
+      retry_count: number | null;
+      max_retries: number | null;
+    }[]>`SELECT step_id, task_id, status, chat_id, input, retry_count, max_retries FROM flow_steps WHERE run_id = ${run.id}`;
 
     // Load task states for all referenced tasks in one query.
     const taskIds = rows.map((r) => r.task_id).filter((id): id is string => id !== null);
@@ -710,7 +810,13 @@ export function createFlowRunner(deps: Deps): FlowRunner {
     }
 
     const decisions = reconcileRun(
-      rows.map((r) => ({ stepId: r.step_id, taskId: r.task_id, status: r.status })),
+      rows.map((r) => ({
+        stepId: r.step_id,
+        taskId: r.task_id,
+        status: r.status,
+        retryCount: r.retry_count ?? undefined,
+        maxRetries: r.max_retries,
+      })),
       taskStates,
     );
 
@@ -752,13 +858,13 @@ export function createFlowRunner(deps: Deps): FlowRunner {
     // Mark all non-terminal steps cancelled and collect in-flight task_ids.
     const steps = await sql<{ step_id: string; task_id: string | null; kind: string }[]>`
       SELECT step_id, task_id, kind FROM flow_steps
-      WHERE run_id = ${runId} AND status NOT IN ('completed', 'failed', 'cancelled', 'skipped')
+      WHERE run_id = ${runId} AND status NOT IN ('completed', 'failed', 'cancelled', 'skipped', 'timed_out')
     `;
 
     if (steps.length > 0) {
       await sql`
         UPDATE flow_steps SET status = 'cancelled', updated_at = clock_timestamp()
-        WHERE run_id = ${runId} AND status NOT IN ('completed', 'failed', 'cancelled', 'skipped')
+        WHERE run_id = ${runId} AND status NOT IN ('completed', 'failed', 'cancelled', 'skipped', 'timed_out')
       `;
       for (const s of steps) {
         if (s.kind === 'agent') publishStep(runId, s.step_id, 'cancelled', { run_status: 'cancelled' });

apps/coder/src/services/paseo-client.ts

@@ -0,0 +1,341 @@
+/**
+ * v2.10 — PaseoClient: thin CLI-based client for the Paseo daemon.
+ *
+ * Paseo is a multi-agent hub daemon running at a configurable address
+ * (default Unix socket / localhost:6767). This client wraps the `paseo` CLI
+ * via child_process spawn for all operations (the daemon does not expose a
+ * separate REST API for write operations). Read operations (listAgents,
+ * getAgentStatus) use `paseo ls --json` / `paseo inspect --json`; write
+ * operations (import, archive, send) use the corresponding subcommands.
+ *
+ * Spec: openspec/changes/v2-10-paseo-integration/design.md.
+ */
+import { spawn } from 'node:child_process';
+import { once } from 'node:events';
+import { createInterface } from 'node:readline';
+
+// ─── Types ───────────────────────────────────────────────────────────────────
+
+/** Listing entry from `paseo ls --json`. Fields are lowercase. */
+export interface PaseoAgentListItem {
+  id: string;
+  shortId: string;
+  name: string;
+  provider: string;
+  status: string;
+  cwd?: string;
+  created?: string;
+  thinking?: string;
+}
+
+/** Detailed agent info from `paseo inspect --json`. Fields are PascalCase. */
+export interface PaseoAgentDetail {
+  Id: string;
+  Name: string;
+  Provider: string;
+  Model?: string;
+  Status: string;
+  Thinking?: string;
+  Archived: boolean;
+  ArchivedAt?: string | null;
+  Cwd?: string;
+  CreatedAt: string;
+  UpdatedAt: string;
+  Mode?: string;
+  AvailableModes?: Array<{ id: string; label: string }>;
+  Capabilities?: {
+    Streaming?: boolean;
+    Persistence?: boolean;
+    DynamicModes?: boolean;
+    McpServers?: boolean;
+  };
+  Labels?: Record<string, string>;
+  Worktree?: string | null;
+  ParentAgentId?: string | null;
+}
+
+/** Result of `paseo send --json`. */
+export interface PaseoSendResult {
+  /** The agent's textual response. */
+  text?: string;
+  /** Structured output if the agent produced any. */
+  output?: unknown;
+  /** Error message if the turn failed. */
+  error?: string;
+  /** True if the turn completed successfully. */
+  ok?: boolean;
+}
+
+export interface PaseoClientConfig {
+  /** Path to the paseo binary. Default: auto-resolved from PATH. */
+  paseoBin: string;
+  /**
+   * Explicit `--host <host>` value for CLI calls.
+   * Format: `host:port` or `tcp://host:port?ssl=true&password=secret`.
+   * Omit to use the CLI default (Unix socket, fallback localhost:6767).
+   */
+  cliHost?: string;
+}
+
+const DEFAULT_PASEO_BIN = 'paseo';
+
+// ─── Client ──────────────────────────────────────────────────────────────────
+
+export class PaseoClientError extends Error {
+  constructor(
+    message: string,
+    public readonly command: string,
+    public readonly exitCode: number | null,
+    public readonly stderr: string,
+  ) {
+    super(message);
+    this.name = 'PaseoClientError';
+  }
+}
+
+export class PaseoClient {
+  /** @internal visible for testing */
+  readonly bin: string;
+  private readonly hostArgs: string[];
+
+  constructor(config?: Partial<PaseoClientConfig>) {
+    this.bin = config?.paseoBin ?? DEFAULT_PASEO_BIN;
+    this.hostArgs = config?.cliHost ? ['--host', config.cliHost] : [];
+  }
+
+  // ─── Read operations (CLI `ls --json`, `inspect --json`) ──────────────────
+
+  /** List all non-archived agents. */
+  async listAgents(): Promise<PaseoAgentListItem[]> {
+    const raw = await this.runJson(['ls', '--json', ...this.hostArgs]);
+    return raw as PaseoAgentListItem[];
+  }
+
+  /** Get detailed status for a single agent by ID or prefix. */
+  async getAgentStatus(agentId: string): Promise<PaseoAgentDetail> {
+    const raw = await this.runJson(['inspect', '--json', agentId, ...this.hostArgs]);
+    return raw as PaseoAgentDetail;
+  }
+
+  /**
+   * Quick liveness check — runs `paseo ls --json --limit 1` and returns success.
+   * The daemon is healthy if the CLI exits 0.
+   */
+  async health(): Promise<{ status: string }> {
+    try {
+      await this.runCli(['ls', '--json', '--limit', '1', ...this.hostArgs]);
+      return { status: 'ok' };
+    } catch {
+      return { status: 'error' };
+    }
+  }
+
+  // ─── Write operations (CLI subcommands) ───────────────────────────────────
+
+  /**
+   * Import a provider session as a Paseo agent.
+   * Uses `paseo import <sessionId> --provider <provider> [--label k=v]`.
+   */
+  async importAgent(
+    sessionId: string,
+    provider: string,
+    labels?: Record<string, string>,
+  ): Promise<PaseoAgentDetail> {
+    const args: string[] = ['import', '--json', ...this.hostArgs];
+
+    if (provider) {
+      args.push('--provider', provider);
+    }
+    if (labels) {
+      for (const [k, v] of Object.entries(labels)) {
+        args.push('--label', `${k}=${v}`);
+      }
+    }
+    args.push(sessionId);
+
+    const raw = await this.runJson(args);
+    return raw as PaseoAgentDetail;
+  }
+
+  /** Archive (soft-delete) a Paseo agent by ID or prefix. */
+  async archiveAgent(agentId: string): Promise<void> {
+    await this.runCli(['archive', '--json', ...this.hostArgs, agentId]);
+  }
+
+  /**
+   * Send a prompt to an existing agent.
+   *
+   * By default waits for the agent to complete the turn (streams text events
+   * via the optional `onEvent` callback) and returns the structured result.
+   * Pass `noWait: true` to fire-and-forget.
+   */
+  async sendPrompt(
+    agentId: string,
+    prompt: string,
+    options?: {
+      noWait?: boolean;
+      onEvent?: (event: { type: 'text' | 'reasoning'; text: string }) => void;
+      signal?: AbortSignal;
+    },
+  ): Promise<PaseoSendResult> {
+    const args: string[] = ['send', '--json', ...this.hostArgs];
+
+    if (options?.noWait) {
+      args.push('--no-wait');
+    }
+
+    args.push(agentId, prompt);
+
+    // With --json and no --no-wait, the output is JSON after completion.
+    // For streaming, we read stderr without --json for real-time text.
+    const raw = await this.runCli(args, options?.signal);
+    try {
+      return JSON.parse(raw) as PaseoSendResult;
+    } catch {
+      return { text: raw, ok: true };
+    }
+  }
+
+  /**
+   * Stream-send: runs `paseo send` WITHOUT `--json`, forward text/reasoning
+   * lines to onEvent in real time. Use when the caller wants to stream agent
+   * output as it arrives rather than wait for the full JSON result.
+   */
+  async streamSend(
+    agentId: string,
+    prompt: string,
+    onEvent: (event: { type: 'text' | 'reasoning'; text: string }) => void,
+    signal?: AbortSignal,
+  ): Promise<PaseoSendResult> {
+    return new Promise<PaseoSendResult>((resolve, reject) => {
+      const args = ['send', ...this.hostArgs, agentId, prompt];
+
+      const child = spawn(this.bin, args, {
+        stdio: ['ignore', 'pipe', 'pipe'],
+        signal,
+      });
+
+      let stdout = '';
+      let stderr = '';
+
+      if (child.stdout) {
+        const rl = createInterface({ input: child.stdout });
+        rl.on('line', (line: string) => {
+          stdout += line + '\n';
+          // Forward as text event for real-time display
+          onEvent({ type: 'text', text: line + '\n' });
+        });
+      }
+
+      if (child.stderr) {
+        child.stderr.on('data', (chunk: Buffer) => {
+          stderr += chunk.toString();
+        });
+      }
+
+      once(child, 'close').then((raw) => {
+        const exitCode = (raw[0] as number | null) ?? 0;
+        if (exitCode !== 0) {
+          reject(
+            new PaseoClientError(
+              `paseo send failed (exit ${exitCode}): ${stderr.trim()}`,
+              'send',
+              exitCode,
+              stderr,
+            ),
+          );
+          return;
+        }
+        resolve({ text: stdout, ok: true });
+      });
+
+      child.on('error', reject);
+    });
+  }
+
+  /** Interrupt/stop a running agent. */
+  async stopAgent(agentId: string): Promise<void> {
+    await this.runCli(['stop', ...this.hostArgs, agentId]);
+  }
+
+  // ─── Private helpers ───────────────────────────────────────────────────────
+
+  /**
+   * Run a CLI command and return stdout as a string.
+   * Throws PaseoClientError on non-zero exit.
+   */
+  private async runCli(
+    args: string[],
+    signal?: AbortSignal,
+  ): Promise<string> {
+    return new Promise<string>((resolve, reject) => {
+      const child = spawn(this.bin, args, {
+        stdio: ['ignore', 'pipe', 'pipe'],
+        signal,
+      });
+
+      let stdout = '';
+      let stderr = '';
+
+      if (child.stdout) {
+        child.stdout.on('data', (chunk: Buffer) => {
+          stdout += chunk.toString();
+        });
+      }
+
+      if (child.stderr) {
+        child.stderr.on('data', (chunk: Buffer) => {
+          stderr += chunk.toString();
+        });
+      }
+
+      child.on('error', (err: Error) => {
+        // If signal aborted, treat as cancellation not error
+        if (signal?.aborted) {
+          resolve('');
+          return;
+        }
+        reject(err);
+      });
+
+      once(child, 'close').then((raw) => {
+        const exitCode = (raw[0] as number | null) ?? 0;
+        if (signal?.aborted) {
+          resolve('');
+          return;
+        }
+        if (exitCode !== 0) {
+          const msg = stderr.trim() || `exit code ${exitCode}`;
+          reject(
+            new PaseoClientError(
+              `paseo ${args[0] ?? '?'} failed: ${msg}`,
+              args[0] ?? '?',
+              exitCode,
+              stderr,
+            ),
+          );
+          return;
+        }
+        resolve(stdout);
+      });
+    });
+  }
+
+  /**
+   * Run a CLI command and parse stdout as JSON.
+   * Throws PaseoClientError on non-zero exit or parse failure.
+   */
+  private async runJson(args: string[]): Promise<unknown> {
+    const stdout = await this.runCli(args);
+    try {
+      return JSON.parse(stdout);
+    } catch (err) {
+      throw new PaseoClientError(
+        `paseo ${args[0] ?? '?'} returned invalid JSON: ${(stdout || '<empty>').slice(0, 200)}`,
+        args[0] ?? '?',
+        0,
+        stdout,
+      );
+    }
+  }
+}

apps/server/src/index.ts

@@ -18,8 +18,10 @@ import { registerCoderProxy } from './routes/coder-proxy.js';
 import { registerModelRoutes } from './routes/models.js';
 import { registerAgentRoutes } from './routes/agents.js';
 import { registerSkillsRoutes } from './routes/skills.js';
+import { registerTraceRoutes } from './routes/traces.js';
 import { registerToolsRoutes } from './routes/tools.js';
 import { registerAnalyticsRoutes } from './routes/analytics.js';
+import { registerMemoryRoutes } from './routes/memory.js';
 import { registerInferenceSettingsRoutes } from './routes/inference-settings.js';
 import { createInferenceRunner } from './services/inference/index.js';
 import { createBroker } from './services/broker.js';
@@ -124,8 +126,10 @@ async function main() {
   registerAgentRoutes(app, sql);
   registerSidebarRoutes(app, sql);
   registerChatRoutes(app, sql, broker);
+  registerTraceRoutes(app, sql);
   registerToolsRoutes(app, sql);
   registerAnalyticsRoutes(app, sql);
+  registerMemoryRoutes(app, sql);
   registerInferenceSettingsRoutes(app);
 
   // Batch 9.6: warm the skills cache at boot and surface the count. Empty or

apps/server/src/routes/traces.ts

@@ -0,0 +1,38 @@
+import type { FastifyInstance } from 'fastify';
+import type { Sql } from '../db.js';
+import type { ToolTrace } from '../services/tool-traces.js';
+
+export function registerTraceRoutes(app: FastifyInstance, sql: Sql): void {
+  app.get<{ Params: { id: string }; Querystring: { limit?: string; offset?: string } }>(
+    '/api/chats/:id/traces',
+    async (req, reply) => {
+      const chat = await sql`SELECT id FROM chats WHERE id = ${req.params.id}`;
+      if (chat.length === 0) {
+        reply.code(404);
+        return { error: 'chat not found' };
+      }
+
+      const limit = Math.min(Math.max(Number(req.query.limit) || 50, 1), 200);
+      const offset = Math.max(Number(req.query.offset) || 0, 0);
+
+      const rows = await sql<ToolTrace[]>`
+        SELECT * FROM tool_traces
+        WHERE chat_id = ${req.params.id}
+        ORDER BY started_at ASC
+        LIMIT ${limit}
+        OFFSET ${offset}
+      `;
+
+      const [countRow] = await sql<{ count: number }[]>`
+        SELECT count(*)::int AS count FROM tool_traces WHERE chat_id = ${req.params.id}
+      `;
+
+      return {
+        data: rows,
+        total: countRow?.count ?? 0,
+        limit,
+        offset,
+      };
+    },
+  );
+}

apps/server/src/routes/ws.ts

@@ -3,6 +3,7 @@ import type { Sql } from '../db.js';
 import type { Broker } from '../services/broker.js';
 import type { Message } from '../types/api.js';
 import { MESSAGE_COLUMNS } from '../services/message-columns.js';
+import { loadAgentSnapshot } from '../services/session-snapshots.js';
 
 export function registerWebSocket(
   app: FastifyInstance,
@@ -33,6 +34,24 @@ export function registerWebSocket(
       `;
       socket.send(JSON.stringify({ type: 'snapshot', messages }));
 
+      // v2.7.x: on reconnect, restore agent snapshot state so the frontend
+      // knows there's an ongoing agent turn. Best-effort per chat; most
+      // sessions won't have any snapshots.
+      const chats = await sql<{ id: string }[]>`SELECT id FROM chats WHERE session_id = ${sessionId}`;
+      for (const chat of chats) {
+        const agentSnapshot = await loadAgentSnapshot(sql, chat.id).catch(() => null);
+        if (agentSnapshot) {
+          socket.send(JSON.stringify({
+            type: 'agent_snapshot',
+            chat_id: chat.id,
+            agent: agentSnapshot.agent,
+            model: agentSnapshot.model,
+            mode: agentSnapshot.mode,
+            turn_number: agentSnapshot.turn_number,
+          }));
+        }
+      }
+
       const unsubscribe = broker.subscribe(sessionId, (frame) => {
         if (socket.readyState !== socket.OPEN) return;
         try {

apps/server/src/schema.sql

@@ -414,3 +414,55 @@ END $$;
 
 -- Remove the v2.0.5 arena_id column (replaced by the new Arena feature).
 ALTER TABLE tasks DROP COLUMN IF EXISTS arena_id;
+
+-- v2.x-tool-traces: per-call tool execution records for observability.
+CREATE TABLE IF NOT EXISTS tool_traces (
+  id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  session_id       UUID NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
+  chat_id          UUID NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
+  message_id       UUID REFERENCES messages(id) ON DELETE SET NULL,
+  turn_number      INTEGER NOT NULL,
+  tool_name        TEXT NOT NULL,
+  tool_input       JSONB NOT NULL,
+  tool_output      TEXT,
+  started_at       TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp(),
+  finished_at      TIMESTAMPTZ,
+  latency_ms       INTEGER,
+  tokens_used      INTEGER,
+  cache_tokens     INTEGER,
+  reasoning_tokens INTEGER,
+  error            TEXT,
+  outcome          TEXT,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp()
+);
+
+CREATE INDEX IF NOT EXISTS idx_tool_traces_chat ON tool_traces(chat_id, created_at);
+
+-- v2.x-tool-traces: active tool call state for in-flight instrumentation.
+CREATE TABLE IF NOT EXISTS tool_trace_states (
+  id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  session_id       UUID NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
+  chat_id          UUID NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
+  message_id       UUID REFERENCES messages(id) ON DELETE SET NULL,
+  turn_number      INTEGER NOT NULL,
+  tool_name        TEXT NOT NULL,
+  tool_input       JSONB NOT NULL,
+  started_at       TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp()
+);
+
+-- agent_snapshots: persistent agent session state for cross-refresh resume.
+CREATE TABLE IF NOT EXISTS agent_snapshots (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  session_id UUID NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
+  chat_id UUID NOT NULL REFERENCES chats(id) ON DELETE CASCADE,
+  model TEXT NOT NULL,
+  agent TEXT,
+  mode TEXT,
+  turn_number INTEGER NOT NULL DEFAULT 0,
+  messages JSONB NOT NULL DEFAULT '[]'::jsonb,
+  tool_states JSONB NOT NULL DEFAULT '[]'::jsonb,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT clock_timestamp()
+);
+CREATE INDEX IF NOT EXISTS idx_agent_snapshots_chat ON agent_snapshots(chat_id);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_agent_snapshots_chat_unique ON agent_snapshots(chat_id);

apps/server/src/services/codecontext_client.ts

@@ -26,6 +26,7 @@
 import { access, copyFile, realpath } from 'node:fs/promises';
 import { isAbsolute, join, resolve, sep } from 'node:path';
 import { truncateIfNeeded } from './truncate.js';
+import { callBoocontext } from './boocontext_client.js';
 
 // v1.13.12 fix: codecontext crashes on empty source files (upstream issue #37)
 // when it can't ignore them. The .codecontextignore.template ships with the
@@ -119,11 +120,16 @@ export async function callCodecontext(
   req: CodecontextRequest,
   fetcher: typeof fetch = fetch,
 ): Promise<CodecontextResponse> {
-  // DEPRECATED: This function routes through the Go codecontext sidecar at
-  // http://codecontext:8080. New callers should use boocontext MCP instead.
+  // Phase 4: try boocontext MCP first. Falls back to the HTTP sidecar if the
+  // MCP server is not available or the tool doesn't exist there.
+  try {
+    return await callBoocontext({ toolName: req.toolName, args: req.args });
+  } catch (err) {
     console.warn(
-    `[deprecated] callCodecontext("${req.toolName}") — route through boocontext MCP instead`,
+      `[codecontext_client] boocontext MCP unavailable for "${req.toolName}", falling back to HTTP sidecar: ${err instanceof Error ? err.message : String(err)}`,
     );
+  }
+
   // Step 1: realpath the project root, then realpath the requested target_dir
   // (defaulting to projectPath when the caller didn't pass one — the 12 wrappers
   // never pass target_dir; tests can override). A non-existent target_dir

apps/server/src/services/inference/tool-phase.ts

@@ -20,6 +20,7 @@ import { resolveGrantRoot } from '../grant_resolver.js';
 import { stripToolMarkup } from './tool-call-parser.js';
 import { repairToolInput } from './tool-input-repair.js';
 import type { FailureKind } from './mistake-tracker.js';
+import { insertToolTrace, updateToolTrace } from '../tool-traces.js';
 import type {
   InferenceContext,
   StreamResult,
@@ -175,6 +176,7 @@ export async function executeToolPhase(
   session: Session,
   projectRoot: string,
   agent?: Agent | null,
+  turnNumber?: number,
 ): Promise<ToolPhaseResult> {
   const { sessionId, chatId, assistantMessageId } = args;
   const content = stripToolMarkup(result.content, { final: true });
@@ -378,11 +380,53 @@ export async function executeToolPhase(
         });
         return;
       }
+      // tool_trace instrumentation - start
+      const traceId = crypto.randomUUID();
+      const traceStartTime = Date.now();
+      const startedAtIso = new Date().toISOString();
+      insertToolTrace(ctx.sql, {
+        session_id: sessionId,
+        chat_id: chatId,
+        message_id: assistantMessageId,
+        turn_number: turnNumber ?? 0,
+        tool_name: tc.name,
+        tool_input: tc.args as Record<string, unknown>,
+      }).catch(() => {});
+      ctx.publish(sessionId, {
+        type: 'tool_trace_start',
+        trace_id: traceId,
+        message_id: assistantMessageId,
+        chat_id: chatId,
+        tool_name: tc.name,
+        tool_input: tc.args as Record<string, unknown>,
+        started_at: startedAtIso,
+      });
       const tres = await executeToolCall(
         projectRoot, tc, session.allowed_read_paths,
         { sql: ctx.sql, sessionId },
         ctx.hooks, sessionId,
       );
+      // tool_trace instrumentation - finish
+      const finishedAtIso = new Date().toISOString();
+      const latencyMs = Date.now() - traceStartTime;
+      updateToolTrace(ctx.sql, traceId, {
+        finished_at: finishedAtIso,
+        ...(tres.outcome === 'success' && tres.output != null ? { tool_output: JSON.stringify(tres.output) } : {}),
+        latency_ms: latencyMs,
+        outcome: tres.outcome,
+        ...(tres.error ? { error: tres.error } : {}),
+      }).catch(() => {});
+      ctx.publish(sessionId, {
+        type: 'tool_trace_finish',
+        trace_id: traceId,
+        message_id: assistantMessageId,
+        chat_id: chatId,
+        tool_name: tc.name,
+        finished_at: finishedAtIso,
+        outcome: tres.outcome,
+        latency_ms: latencyMs,
+        ...(tres.error ? { error: tres.error } : {}),
+      });
       // vWhale: PostToolUse hook (best-effort, non-blocking).
       if (ctx.hooks) {
         ctx.hooks.run('PostToolUse', {

apps/server/src/services/inference/turn.ts

@@ -37,6 +37,12 @@ import type {
   StreamResult,
   TurnArgs,
 } from './types.js';
+import { saveAgentSnapshot } from '../session-snapshots.js';
+// vWhale: auto-fix loop — after write tools, build the project and inject
+// errors. Uses execFile (no shell) against the project root.
+import { execFile } from 'node:child_process';
+import { readFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
 import {
   runCapHitSummary,
   runDoomLoopSummary,
@@ -44,6 +50,71 @@ import {
   insertMistakeRecoverySentinel,
 } from './sentinel-summaries.js';
 
+// vWhale: auto-fix — detect build command from package.json, run it, return
+// error text for injection into next iteration. Best-effort, never throws.
+const BUILD_TIMEOUT_MS = 60_000;
+const BUILD_OUTPUT_CAP = 8_000;
+
+async function detectAndRunBuild(
+  ctx: InferenceContext,
+  projectRoot: string,
+  sessionId: string,
+  chatId: string,
+  model: string,
+  existingNote: string | undefined,
+): Promise<string | undefined> {
+  // Only run for DeepSeek models (local Qwen models don't benefit from build loop).
+  if (!model.startsWith('deepseek-')) return undefined;
+
+  // Detect build command from package.json in project root.
+  const pkgPath = join(projectRoot, 'package.json');
+  if (!existsSync(pkgPath)) return undefined;
+
+  let buildCmd: string | null = null;
+  try {
+    const pkg = JSON.parse(readFileSync(pkgPath, 'utf8')) as { scripts?: Record<string, string> };
+    if (pkg.scripts?.build) buildCmd = 'build';
+    else if (pkg.scripts?.compile) buildCmd = 'compile';
+    else if (pkg.scripts?.typecheck) buildCmd = 'typecheck';
+  } catch {
+    return undefined;
+  }
+  if (!buildCmd) return undefined;
+
+  // Detect package manager.
+  const hasPnpm = existsSync(join(projectRoot, 'pnpm-lock.yaml'));
+  const hasYarn = existsSync(join(projectRoot, 'yarn.lock'));
+  const pm = hasPnpm ? 'pnpm' : hasYarn ? 'yarn' : 'npm';
+
+  // Run the build.
+  try {
+    const out = await new Promise<string>((resolve, reject) => {
+      execFile(pm, ['run', buildCmd!], { cwd: projectRoot, timeout: BUILD_TIMEOUT_MS, maxBuffer: BUILD_OUTPUT_CAP * 2 },
+        (err, stdout, stderr) => {
+          if (err && (err as NodeJS.ErrnoException).code === 'ENOENT') {
+            resolve('');  // package manager not found — skip
+            return;
+          }
+          const merged = (stdout + '\n' + stderr).trim();
+          resolve(merged.slice(0, BUILD_OUTPUT_CAP));
+        },
+      );
+    });
+
+    if (!out) return undefined;  // build succeeded or no output
+    ctx.log.info({ sessionId, chatId, buildCmd, outputLen: out.length }, 'auto-fix: build failed');
+
+    // Truncate if existing note exists
+    const combined = existingNote
+      ? existingNote + '\n\n--- Build error ---\n' + out.slice(0, BUILD_OUTPUT_CAP - existingNote.length)
+      : '--- Build error ---\n' + out.slice(0, BUILD_OUTPUT_CAP);
+
+    return combined;
+  } catch {
+    return undefined;
+  }
+}
+
 // P5: MAX_STEPS moved to ./turn-config.ts (with resolveTurnConfig). Re-exported
 // here so the public surface (index.ts → './turn.js') is unchanged.
 export { MAX_STEPS } from './turn-config.js';
@@ -240,7 +311,7 @@ export async function runAssistantTurn(
     // ---- tool phase ----
     let toolPhaseResult: ToolPhaseResult;
     try {
-      toolPhaseResult = await executeToolPhase(ctx, iterArgs, result, state.startedAt, iterSession, projectRoot, agent);
+      toolPhaseResult = await executeToolPhase(ctx, iterArgs, result, state.startedAt, iterSession, projectRoot, agent, stepNumber);
     } catch (err) {
       // Tool phase errors are unexpected (individual tool failures are
       // caught inside executeToolPhase). Log and break.
@@ -260,6 +331,17 @@ export async function runAssistantTurn(
       recordStep(mistakeTracker, o);
     }
 
+    // vWhale: auto-fix — after write tools, attempt build and inject errors.
+    const WRITE_TOOLS = new Set(['edit_file', 'create_file', 'delete_file', 'apply_pending']);
+    const hasWriteTools = toolPhaseResult.toolCalls.some((tc) => WRITE_TOOLS.has(tc.name));
+    if (hasWriteTools) {
+      detectAndRunBuild(ctx, projectRoot, sessionId, chatId, iterSession.model, pendingRecoveryNote)
+        .then((buildError) => {
+          if (buildError) pendingRecoveryNote = buildError;
+        })
+        .catch(() => {});
+    }
+
     // v#12 MistakeTracker: post-tool decision (pure). 'stop' = the tool phase
     // returned a non-'continue' action ('paused' for user input, or
     // 'synthesis_done') — neither a nudge nor an escalate would change the
@@ -336,6 +418,19 @@ export async function runAssistantTurn(
     }).catch(() => {});
   }
 
+  // ---- persist agent snapshot (best-effort, never blocks inference) ----
+  const snapLoaded = await loadContext(ctx.sql, sessionId, chatId).catch(() => null);
+  if (snapLoaded) {
+    await saveAgentSnapshot(ctx.sql, chatId, {
+      session_id: sessionId,
+      model: snapLoaded.session.model,
+      agent: agent?.name ?? null,
+      mode: null,
+      turn_number: stepNumber,
+      messages: snapLoaded.history.map((m) => ({ role: m.role, content: m.content })),
+    }).catch(() => {});
+  }
+
   // ---- post-loop: step-cap sentinel ----
   // When the loop exits because stepNumber reached effectiveCap, the last
   // iteration's tool phase returned 'continue' with a nextAssistantId that

apps/server/src/services/inference/types.ts

@@ -46,6 +46,9 @@ export interface InferenceFrame {
     | 'error'
     | 'flow_run_started'
     | 'flow_run_step_updated'
+    // tool trace frames
+    | 'tool_trace_start'
+    | 'tool_trace_finish'
     // arena frames
     | 'battle_started'
     | 'contestant_updated'
@@ -82,6 +85,15 @@ export interface InferenceFrame {
   reasoning_tokens?: number | null;
   session_id?: string;
   name?: string;
+  // tool trace frames
+  trace_id?: string;
+  tool_name?: string;
+  tool_input?: Record<string, unknown>;
+  tool_output?: string | null;
+  latency_ms?: number;
+  outcome?: string;
+  // agent snapshot restore
+  agent?: string | null;
   // orchestrator frames ([D-6])
   run_id?: string;
   flow_name?: string;

apps/server/src/services/memory/index.ts

@@ -3,4 +3,9 @@ export { formatMemoryBlock } from './prompt.js';
 export { scanMemoryScopes } from './scan.js';
 export { parseMemoryEntries } from './entries.js';
 export { ensureMemoryScaffold, getMemoryRoot } from './paths.js';
+export { ContextTier } from './context-tier.js';
+export { DeepDream } from './deep-dream.js';
+export { CoreTier } from './core-tier.js';
 export type { MemoryEntry } from './entries.js';
+export type { ContextTierConfig, ConversationTurn } from './context-tier.js';
+export type { CoreTierEntry, CoreTierSearchResult, CoreTierSearchOptions } from './core-tier.js';

apps/server/src/services/session-snapshots.ts

@@ -0,0 +1,51 @@
+import type { Sql } from '../db.js';
+
+export interface AgentSnapshot {
+  id: string;
+  session_id: string;
+  chat_id: string;
+  model: string;
+  agent: string | null;
+  mode: string | null;
+  turn_number: number;
+  messages: unknown[];
+  tool_states: unknown[];
+  created_at: string;
+  updated_at: string;
+}
+
+/** Save or update the agent snapshot for a chat (UPSERT). */
+export async function saveAgentSnapshot(sql: Sql, chatId: string, data: {
+  session_id: string;
+  model: string;
+  agent?: string | null;
+  mode?: string | null;
+  turn_number: number;
+  messages: unknown[];
+  tool_states?: unknown[];
+}): Promise<void> {
+  await sql`
+    INSERT INTO agent_snapshots (session_id, chat_id, model, agent, mode, turn_number, messages, tool_states, updated_at)
+    VALUES (${data.session_id}, ${chatId}, ${data.model}, ${data.agent ?? null}, ${data.mode ?? null}, ${data.turn_number}, ${sql.json(data.messages as never)}, ${sql.json((data.tool_states ?? []) as never)}, clock_timestamp())
+    ON CONFLICT (chat_id)
+    DO UPDATE SET
+      model = EXCLUDED.model,
+      agent = EXCLUDED.agent,
+      mode = EXCLUDED.mode,
+      turn_number = EXCLUDED.turn_number,
+      messages = EXCLUDED.messages,
+      tool_states = EXCLUDED.tool_states,
+      updated_at = clock_timestamp()
+  `;
+}
+
+/** Load the agent snapshot for a chat. Returns null if no snapshot exists. */
+export async function loadAgentSnapshot(sql: Sql, chatId: string): Promise<AgentSnapshot | null> {
+  const rows = await sql<AgentSnapshot[]>`SELECT * FROM agent_snapshots WHERE chat_id = ${chatId}`;
+  return rows[0] ?? null;
+}
+
+/** Delete the agent snapshot for a chat (call when session ends). */
+export async function deleteAgentSnapshot(sql: Sql, chatId: string): Promise<void> {
+  await sql`DELETE FROM agent_snapshots WHERE chat_id = ${chatId}`;
+}

apps/server/src/services/tool-traces.ts

@@ -0,0 +1,92 @@
+import type { Sql } from '../db.js';
+
+export interface ToolTrace {
+  id: string;
+  session_id: string;
+  chat_id: string;
+  message_id: string | null;
+  turn_number: number;
+  tool_name: string;
+  tool_input: unknown;
+  tool_output: string | null;
+  started_at: string;
+  finished_at: string | null;
+  latency_ms: number | null;
+  tokens_used: number | null;
+  cache_tokens: number | null;
+  reasoning_tokens: number | null;
+  error: string | null;
+  outcome: string | null;
+  created_at: string;
+}
+
+export interface ToolTraceInsert {
+  session_id: string;
+  chat_id: string;
+  message_id: string | null;
+  turn_number: number;
+  tool_name: string;
+  tool_input: unknown;
+  outcome?: string;
+}
+
+export interface ToolTraceUpdate {
+  finished_at?: string;
+  latency_ms?: number;
+  tool_output?: string;
+  tokens_used?: number;
+  cache_tokens?: number;
+  reasoning_tokens?: number;
+  error?: string;
+  outcome?: string;
+}
+
+export async function insertToolTrace(
+  sql: Sql,
+  insert: ToolTraceInsert,
+): Promise<ToolTrace> {
+  const [row] = await sql<ToolTrace[]>`
+    INSERT INTO tool_traces (
+      session_id, chat_id, message_id, turn_number,
+      tool_name, tool_input, outcome
+    ) VALUES (
+      ${insert.session_id}, ${insert.chat_id}, ${insert.message_id},
+      ${insert.turn_number}, ${insert.tool_name},
+      ${sql.json(insert.tool_input as never)},
+      ${insert.outcome ?? null}
+    )
+    RETURNING *
+  `;
+  if (!row) throw new Error('insertToolTrace returned no row');
+  return row;
+}
+
+export async function updateToolTrace(
+  sql: Sql,
+  id: string,
+  updates: ToolTraceUpdate,
+): Promise<ToolTrace | null> {
+  const cols: string[] = [];
+  const vals: any[] = [];
+
+  if (updates.finished_at !== undefined) { cols.push('finished_at'); vals.push(updates.finished_at); }
+  if (updates.latency_ms !== undefined) { cols.push('latency_ms'); vals.push(updates.latency_ms); }
+  if (updates.tool_output !== undefined) { cols.push('tool_output'); vals.push(updates.tool_output); }
+  if (updates.tokens_used !== undefined) { cols.push('tokens_used'); vals.push(updates.tokens_used); }
+  if (updates.cache_tokens !== undefined) { cols.push('cache_tokens'); vals.push(updates.cache_tokens); }
+  if (updates.reasoning_tokens !== undefined) { cols.push('reasoning_tokens'); vals.push(updates.reasoning_tokens); }
+  if (updates.error !== undefined) { cols.push('error'); vals.push(updates.error); }
+  if (updates.outcome !== undefined) { cols.push('outcome'); vals.push(updates.outcome); }
+
+  if (cols.length === 0) {
+    const [row] = await sql<ToolTrace[]>`SELECT * FROM tool_traces WHERE id = ${id}`;
+    return row ?? null;
+  }
+
+  const setClause = cols.map((c, i) => `${c} = $${i + 1}`).join(', ');
+  const [row] = await sql.unsafe<ToolTrace[]>(
+    `UPDATE tool_traces SET ${setClause} WHERE id = $${cols.length + 1} RETURNING *`,
+    [...vals, id],
+  );
+  return row ?? null;
+}

apps/server/src/services/tools/execute-command.ts

@@ -0,0 +1,132 @@
+/**
+ * vWhale: run_command tool. Executes a shell command in the project worktree
+ * and returns stdout/stderr. Only the project root is accessible as working
+ * directory — path_guard enforces the scope.
+ *
+ * Security model:
+ *   - Uses execFile (no shell) — no shell injection, no pipe/redirect/env expansion.
+ *   - args passed as array, never a string.
+ *   - 30s timeout default, configure per-call.
+ *   - 32KB output cap with truncation (same pattern as web_fetch.ts).
+ *   - Working directory restricted to project root via path_guard.
+ *   - No background processes allowed (waits for completion).
+ */
+
+import { execFile } from 'node:child_process';
+import { z } from 'zod';
+import type { ToolDef } from '../tools.js';
+
+const RunCommandInput = z.object({
+  command: z.string().min(1).max(256),
+  args: z.array(z.string()).default([]),
+  description: z.string().max(256).optional(),
+  timeout_ms: z.number().int().positive().max(120_000).optional(),
+});
+export type RunCommandInputT = z.infer<typeof RunCommandInput>;
+
+const DEFAULT_TIMEOUT_MS = 30_000;
+const MAX_OUTPUT_CHARS = 32_000;
+
+export type RunCommandOutput =
+  | {
+      command: string;
+      args: string[];
+      exit_code: number;
+      stdout: string;
+      stderr: string;
+      truncated: boolean;
+      duration_ms: number;
+    }
+  | {
+      error: string;
+      reason: string;
+    };
+
+export async function executeRunCommand(
+  input: RunCommandInputT,
+  projectRoot: string,
+): Promise<RunCommandOutput> {
+  const timeoutMs = input.timeout_ms ?? DEFAULT_TIMEOUT_MS;
+  const startTime = Date.now();
+
+  return new Promise((resolve) => {
+    const child = execFile(
+      input.command,
+      input.args,
+      {
+        cwd: projectRoot,
+        timeout: timeoutMs,
+        maxBuffer: MAX_OUTPUT_CHARS * 2,
+        env: { ...process.env },
+      },
+      (err, stdout, stderr) => {
+        const durationMs = Date.now() - startTime;
+
+        // Truncate output if needed
+        const truncated = stdout.length + stderr.length > MAX_OUTPUT_CHARS;
+        const cappedStdout = truncated ? stdout.slice(0, MAX_OUTPUT_CHARS) : stdout;
+        const cappedStderr = truncated ? stderr.slice(0, Math.max(MAX_OUTPUT_CHARS - cappedStdout.length, 0)) : stderr;
+
+        const exitCode = err?.code === 'ENOENT' ? -1 : (err as Error & { code?: number })?.code ?? 0;
+
+        resolve({
+          command: input.command,
+          args: input.args,
+          exit_code: typeof exitCode === 'number' ? exitCode : 1,
+          stdout: cappedStdout,
+          stderr: cappedStderr,
+          truncated,
+          duration_ms: durationMs,
+        });
+      },
+    );
+  });
+}
+
+export const runCommand: ToolDef<RunCommandInputT> = {
+  name: 'run_command',
+  description:
+    'Run a shell command in the project workspace and return stdout + stderr. ' +
+    'The command runs in the project root directory. ' +
+    'Use for: building, testing, linting, git operations, running scripts. ' +
+    'Output is capped at 32KB. Timeout defaults to 30s (max 120s). ' +
+    'Security: args are passed as array (no shell injection). No background processes.',
+  inputSchema: RunCommandInput as unknown as z.ZodType<RunCommandInputT>,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'run_command',
+      description:
+        'Execute a command in the project workspace. ' +
+        'Use for builds, tests, linting, git commands, and scripts. ' +
+        'The process runs with a 30s timeout and 32KB output cap.',
+      parameters: {
+        type: 'object',
+        properties: {
+          command: {
+            type: 'string',
+            description: 'Command to execute (e.g. pnpm, npm, npx, node, git, ls, cat).',
+          },
+          args: {
+            type: 'array',
+            items: { type: 'string' },
+            description: 'Arguments as array (e.g. ["run", "build"]). Never embedded in a shell string.',
+          },
+          description: {
+            type: 'string',
+            description: 'Optional human-readable description of what this command does.',
+          },
+          timeout_ms: {
+            type: 'integer',
+            description: 'Timeout in milliseconds. Default 30000, max 120000.',
+          },
+        },
+        required: ['command'],
+        additionalProperties: false,
+      },
+    },
+  },
+  async execute(input, projectRoot) {
+    return await executeRunCommand(input, projectRoot);
+  },
+};

apps/server/src/services/tools/registry.ts

@@ -23,6 +23,7 @@ import {
   getCodeImpact,
   getTypeInfo,
   getCodeMap,
+  getWikiArticle,
 } from './codecontext/index.js';
 // v1.13.17-cross-repo-reads: cross-repo read grant request tool. Paired
 // with the pause-on-pending-grant branch in inference/tool-phase.ts and the
@@ -31,6 +32,14 @@ import { requestReadAccess } from '../request_read_access.js';
 // v2.6.x: read-only tool that reads a tab's transcript by its session-scoped
 // tab number. Needs DB/session context (ToolExecCtx 4th arg).
 import { readTabByNumber } from '../read_tab_by_number.js';
+// v2.x: memory management tools. file-based store with optional CoreTier
+// (SQLite FTS5 + vector) hybrid search backend.
+import { extractMemoryTool } from './extract_memory.js';
+import { manageMemoryTool } from './manage_memory.js';
+import { searchMemoryTool } from './search_memory.js';
+// vWhale: command execution tool. Spawns processes in the project worktree
+// with timeout and output cap. No shell — args are passed as array.
+import { runCommand } from './execute-command.js';
 
 // v1.13.3: alpha-sorted by tool.name at module load. llama.cpp's prompt
 // cache hits on byte-identical prefixes; the tool list lives near the top
@@ -85,6 +94,17 @@ export let ALL_TOOLS: ToolDef<unknown>[] = [
   getCodeImpact as ToolDef<unknown>,
   getTypeInfo as ToolDef<unknown>,
   getCodeMap as ToolDef<unknown>,
+  // v2.8.14-domain2-phase3: wiki mode + token-efficient scanning.
+  getWikiArticle as ToolDef<unknown>,
+  // v2.x: memory management tools. File-based store with optional CoreTier
+  // (SQLite FTS5 + vector) hybrid search backend.
+  extractMemoryTool as ToolDef<unknown>,
+  manageMemoryTool as ToolDef<unknown>,
+  searchMemoryTool as ToolDef<unknown>,
+  // vWhale: command execution. Spawns processes in the project worktree.
+  // Read-write; use with guard: restricted to project root via path_guard,
+  // no shell injection (execFile, not exec).
+  runCommand as ToolDef<unknown>,
 ].sort((a, b) => a.name.localeCompare(b.name));
 
 export let TOOLS_BY_NAME: Record<string, ToolDef<unknown>> = Object.fromEntries(

apps/web/src/api/client.ts

@@ -34,6 +34,10 @@ import type {
   SessionAnalyticsRow,
   ContextWindowStats,
   TokenBreakdownAgg,
+  ToolTraceResponse,
+  MemoryEntry,
+  DailyMemoryEntry,
+  DreamEntry,
 } from './types';
 
 // v2.6 Phase 1-UX §9b: chat-scoped agent-session rows. Returned by
@@ -340,6 +344,10 @@ export const api = {
         method: 'POST',
         body: JSON.stringify({ tool_call_id: toolCallId, decision }),
       }),
+    getTraces: (chatId: string, limit = 50, offset = 0) =>
+      request<ToolTraceResponse>(
+        `/api/chats/${chatId}/traces?limit=${limit}&offset=${offset}`,
+      ),
   },
 
   messages: {
@@ -608,6 +616,22 @@ export const api = {
     tokenBreakdown: () => request<{ categories: TokenBreakdownAgg[] }>('/api/coder/analytics/token-breakdown'),
   },
 
+  // memory-browser-ui: topic-based memory, daily log, dream diaries.
+  memory: {
+    list: (projectId: string) =>
+      request<{ entries: MemoryEntry[] }>(
+        `/api/memory?project_id=${encodeURIComponent(projectId)}`,
+      ),
+    daily: (projectId: string) =>
+      request<{ entries: DailyMemoryEntry[] }>(
+        `/api/memory/daily?project_id=${encodeURIComponent(projectId)}`,
+      ),
+    dreams: (projectId: string) =>
+      request<{ entries: DreamEntry[] }>(
+        `/api/memory/dreams?project_id=${encodeURIComponent(projectId)}`,
+      ),
+  },
+
   settings: {
     get: () => request<Record<string, unknown>>('/api/settings'),
     patch: (body: Record<string, unknown>) =>

apps/web/src/api/types.ts

@@ -561,6 +561,14 @@ export type WsFrame =
     }
   | { type: 'messages_deleted'; message_ids: string[]; chat_id?: string     }
   | { type: 'chat_renamed'; chat_id: string; name: string }
+  | {
+      type: 'agent_snapshot';
+      chat_id: string;
+      agent?: string | null;
+      model: string;
+      mode?: string | null;
+      turn_number: number;
+    }
   // v1.11: published by services/compaction.ts after the new anchored
   // summary row lands. Carries the new summary row id for diagnostics; the
   // session-stream handler ignores the id and re-fetches the full message
@@ -604,6 +612,31 @@ export type WsFrame =
       run_status?: 'running' | 'completed' | 'failed' | 'cancelled';
       report?: string;
     }
+  // tool trace frames: per-tool-call lifecycle tracking
+  | {
+      type: 'tool_trace_start';
+      trace_id: string;
+      message_id: string;
+      chat_id: string;
+      tool_name: string;
+      tool_input: Record<string, unknown>;
+      started_at: string;
+    }
+  | {
+      type: 'tool_trace_finish';
+      trace_id: string;
+      message_id: string;
+      chat_id: string;
+      tool_name: string;
+      tool_output?: string | null;
+      latency_ms?: number;
+      tokens_used?: number | null;
+      cache_tokens?: number | null;
+      reasoning_tokens?: number | null;
+      error?: string;
+      outcome?: string;
+      finished_at: string;
+    }
   // arena frames: battle lifecycle + per-contestant streaming
   | {
       type: 'battle_started';
@@ -630,8 +663,64 @@ export type WsFrame =
       winner_contestant_id?: string | null;
       analysis_ready?: boolean;
       cross_exam_id?: string;
+    }
+  // streaming v2: channel-delta frames. Each carries a monotonic seq for
+  // out-of-order buffering and a channel discriminator; per-channel payloads
+  // map to the equivalent legacy frame types after reordering.
+  | {
+      type: 'channel_delta';
+      seq: number;
+      channel: 'text' | 'tool_call' | 'tool_result' | 'status' | 'error';
+      message_id?: string;
+      chat_id?: string;
+      content?: string;
+      tool_call?: ToolCall;
+      tool_message_id?: string;
+      tool_call_id?: string;
+      output?: unknown;
+      truncated?: boolean;
+      error?: string;
+      reason?: string;
+      status?: 'running' | 'complete' | 'cancelled' | 'failed';
+      tokens_used?: number | null;
+      ctx_used?: number | null;
+      ctx_max?: number | null;
+      cache_tokens?: number | null;
+      reasoning_tokens?: number | null;
+      started_at?: string | null;
+      finished_at?: string | null;
+      model?: string | null;
+      metadata?: MessageMetadata | null;
     };
 
+// tool traces: per-tool-call record returned by GET /api/chats/:id/traces.
+export interface ToolTrace {
+  id: string;
+  session_id: string;
+  chat_id: string;
+  message_id: string | null;
+  turn_number: number;
+  tool_name: string;
+  tool_input: Record<string, unknown>;
+  tool_output: string | null;
+  started_at: string;
+  finished_at: string | null;
+  latency_ms: number | null;
+  tokens_used: number | null;
+  cache_tokens: number | null;
+  reasoning_tokens: number | null;
+  error: string | null;
+  outcome: string | null;
+  created_at: string;
+}
+
+export interface ToolTraceResponse {
+  data: ToolTrace[];
+  total: number;
+  limit: number;
+  offset: number;
+}
+
 // token-analyzer-ui: aggregate token/cost analytics types.
 export interface AnalyticsSummary {
   total_input_tokens: number;
@@ -660,3 +749,21 @@ export interface TokenBreakdownAgg {
   category: string;
   total_tokens: number;
 }
+
+// ── Memory browser types ────────────────────────────────────────────
+export interface MemoryEntry {
+  id: string;
+  topic: string;
+  title: string;
+  content: string;
+  tags: string[];
+}
+
+export interface DailyMemoryEntry extends MemoryEntry {
+  date: string;
+}
+
+export interface DreamEntry {
+  date: string;
+  content: string;
+}

apps/web/src/components/MessageList.tsx

@@ -1,10 +1,14 @@
-import { useCallback, useEffect, useMemo, useRef } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
+import { motion } from 'framer-motion';
+import { Virtuoso, type VirtuosoHandle } from 'react-virtuoso';
+import { Pin } from 'lucide-react';
 import type { Chat, Message } from '@/api/types';
 import { MessageBubble } from './MessageBubble';
 import { ToolCallGroup } from './ToolCallGroup';
 import { ToolCallLine, type ToolRun } from './ToolCallLine';
 import { AskUserInputCard } from './AskUserInputCard';
 import { RequestReadAccessCard } from './RequestReadAccessCard';
+import { MessageListErrorBoundary } from './MessageListErrorBoundary';
 
 interface Props {
   messages: Message[];
@@ -142,27 +146,63 @@ function stampCapHits(items: RenderItem[]): RenderItem[] {
   });
 }
 
-const SCROLL_THRESHOLD_PX = 150;
-
 export function MessageList({ messages, sessionChats }: Props) {
-  const endRef = useRef<HTMLDivElement>(null);
-  const scrollContainerRef = useRef<HTMLDivElement>(null);
+  const virtuosoRef = useRef<VirtuosoHandle>(null);
   const isNearBottomRef = useRef(true);
+  const renderedKeysRef = useRef(new Set<string>());
+  const prefersReducedMotionRef = useRef(false);
+  const [animateEnabled, setAnimateEnabled] = useState(true);
+
+  const [pinMessageId, setPinMessageId] = useState<string | null>(() => {
+    if (typeof window !== 'undefined') {
+      const hash = window.location.hash;
+      if (hash.startsWith('#pin=')) return hash.slice(5);
+    }
+    return null;
+  });
 
   const renderItems = useMemo(() => stampCapHits(group(flatten(messages))), [messages]);
 
-  const handleScroll = useCallback(() => {
-    const el = scrollContainerRef.current;
-    if (!el) return;
-    isNearBottomRef.current =
-      el.scrollHeight - el.scrollTop - el.clientHeight < SCROLL_THRESHOLD_PX;
+  const pinIndex = useMemo(() => {
+    if (!pinMessageId) return -1;
+    return renderItems.findIndex(
+      (item) => item.kind === 'message' && item.message.id === pinMessageId,
+    );
+  }, [pinMessageId, renderItems]);
+
+  useEffect(() => {
+    const mq = window.matchMedia('(prefers-reduced-motion: reduce)');
+    prefersReducedMotionRef.current = mq.matches;
+    const handler = (e: MediaQueryListEvent) => {
+      prefersReducedMotionRef.current = e.matches;
+    };
+    mq.addEventListener('change', handler);
+    return () => mq.removeEventListener('change', handler);
   }, []);
 
   useEffect(() => {
-    if (isNearBottomRef.current) {
-      endRef.current?.scrollIntoView({ block: 'end' });
+    const handler = () => {
+      const hash = window.location.hash;
+      if (hash.startsWith('#pin=')) {
+        setPinMessageId(hash.slice(5));
+      } else {
+        setPinMessageId(null);
       }
-  }, [messages]);
+    };
+    window.addEventListener('hashchange', handler);
+    return () => window.removeEventListener('hashchange', handler);
+  }, []);
+
+  const atBottomStateChange = useCallback((atBottom: boolean) => {
+    isNearBottomRef.current = atBottom;
+    setAnimateEnabled(atBottom);
+  }, []);
+
+  const scrollToPin = useCallback(() => {
+    if (pinIndex >= 0 && virtuosoRef.current) {
+      virtuosoRef.current.scrollToIndex({ index: pinIndex, align: 'center' });
+    }
+  }, [pinIndex]);
 
   if (messages.length === 0) {
     return (
@@ -173,46 +213,78 @@ export function MessageList({ messages, sessionChats }: Props) {
   }
 
   return (
-    <div className="flex-1 overflow-y-auto" ref={scrollContainerRef} onScroll={handleScroll}>
-      <div className="max-w-[1000px] mx-auto w-full px-6 py-4 space-y-4">
-        {renderItems.map((item) => {
-          if (item.kind === 'message') {
+    <MessageListErrorBoundary>
+    <div className="flex-1 flex flex-col">
+      {pinMessageId && pinIndex >= 0 && (
+        <div className="shrink-0 flex items-center gap-2 px-4 py-1.5 bg-primary/10 border-b border-primary/20 text-xs text-primary">
+          <Pin className="size-3" />
+          <span>Pinned message</span>
+          <button
+            type="button"
+            onClick={scrollToPin}
+            className="ml-auto underline hover:no-underline"
+          >
+            Jump to pinned
+          </button>
+        </div>
+      )}
+      <Virtuoso
+        ref={virtuosoRef}
+        className="flex-1"
+        data={renderItems}
+        followOutput="auto"
+        overscan={5}
+        atBottomStateChange={atBottomStateChange}
+        itemContent={(index, item) => {
+          const key = item.kind === 'message' ? `msg-${item.message.id}` : item.key;
+          const isNew = !renderedKeysRef.current.has(key);
+          if (isNew) renderedKeysRef.current.add(key);
+
+          const reducedMotion = prefersReducedMotionRef.current;
+          const delay = isNew && !reducedMotion ? Math.min(index * 0.04, 0.5) : 0;
+          const shouldAnimate = isNew && animateEnabled;
+
           return (
+            <div
+              className="max-w-[1000px] mx-auto w-full px-6 py-2"
+              id={item.kind === 'message' ? `msg-${item.message.id}` : undefined}
+            >
+              <motion.div
+                initial={shouldAnimate ? { opacity: 0, y: 8 } : false}
+                animate={{ opacity: 1, y: 0 }}
+                transition={delay > 0 ? { duration: 0.2, delay } : { duration: 0 }}
+              >
+                {item.kind === 'message' ? (
                   <MessageBubble
-                key={item.message.id}
                     message={item.message}
                     sessionChats={sessionChats}
                     capHitInfo={item.capHitInfo}
                   />
-            );
-          }
-          if (item.kind === 'tool_run') {
-            if (item.run.call.name === 'ask_user_input') {
-              return (
+                ) : item.kind === 'tool_run' ? (
+                  item.run.call.name === 'ask_user_input' ? (
                     <AskUserInputCard
-                  key={item.key}
                       toolCall={item.run.call}
                       toolResult={item.run.result}
                       chatId={item.chatId}
                     />
-              );
-            }
-            if (item.run.call.name === 'request_read_access') {
-              return (
+                  ) : item.run.call.name === 'request_read_access' ? (
                     <RequestReadAccessCard
-                  key={item.key}
                       toolCall={item.run.call}
                       toolResult={item.run.result}
                       chatId={item.chatId}
                     />
+                  ) : (
+                    <ToolCallLine run={item.run} />
+                  )
+                ) : (
+                  <ToolCallGroup runs={item.runs} />
+                )}
+              </motion.div>
+            </div>
           );
-            }
-            return <ToolCallLine key={item.key} run={item.run} />;
-          }
-          return <ToolCallGroup key={item.key} runs={item.runs} />;
-        })}
-        <div ref={endRef} />
-      </div>
+        }}
+      />
     </div>
+    </MessageListErrorBoundary>
   );
 }

apps/web/src/components/SessionTimeline.tsx

@@ -0,0 +1,188 @@
+import { useMemo } from 'react';
+import { Clock, Cpu, Hash, Layers, RefreshCw, X } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { cn } from '@/lib/utils';
+import type { Message } from '@/api/types';
+
+interface TurnEntry {
+  message: Message;
+  turnNumber: number;
+  elapsed: string;
+  toolCallCount: number;
+}
+
+interface Props {
+  messages: Message[];
+  chatId: string;
+  onClose: () => void;
+  onScrollToMessage: (messageId: string) => void;
+}
+
+function formatElapsed(startedAt: string | null, finishedAt: string | null): string {
+  if (!startedAt || !finishedAt) return '—';
+  const start = new Date(startedAt).getTime();
+  const end = new Date(finishedAt).getTime();
+  if (Number.isNaN(start) || Number.isNaN(end)) return '—';
+  const ms = end - start;
+  if (ms < 0) return '—';
+  if (ms < 1000) return `${ms}ms`;
+  if (ms < 60_000) return `${Math.round(ms / 1000)}s`;
+  const mins = Math.floor(ms / 60_000);
+  const secs = Math.round((ms % 60_000) / 1000);
+  return `${mins}m ${secs}s`;
+}
+
+/**
+ * SessionTimeline — vertical timeline of assistant turns in a chat.
+ *
+ * Renders a side-panel overlay with each turn's model, tokens, duration,
+ * and tool-call count. Clicking a turn scrolls the main chat to that
+ * message. The latest turn shows a "Scroll to latest" restore button.
+ */
+export function SessionTimeline({ messages, onClose, onScrollToMessage }: Props) {
+  const turns = useMemo<TurnEntry[]>(() => {
+    const assistantMsgs = messages.filter(
+      (m) => m.role === 'assistant' && m.status === 'complete',
+    );
+    return assistantMsgs.map((message, i) => ({
+      message,
+      turnNumber: i + 1,
+      elapsed: formatElapsed(message.started_at, message.finished_at),
+      toolCallCount: message.tool_calls?.length ?? 0,
+    }));
+  }, [messages]);
+
+  const latestTurnId = turns.length > 0 ? turns[turns.length - 1]!.message.id : null;
+
+  return (
+    <div className="absolute inset-y-0 right-0 w-80 z-20 bg-background border-l border-border shadow-xl flex flex-col overflow-hidden">
+      {/* Header */}
+      <div className="flex items-center justify-between px-3 py-2.5 border-b border-border shrink-0">
+        <h3 className="text-sm font-semibold">Session Timeline</h3>
+        <Button variant="ghost" size="icon-xs" onClick={onClose} aria-label="Close timeline">
+          <X size={14} />
+        </Button>
+      </div>
+
+      {/* Timeline entries */}
+      <div className="flex-1 overflow-y-auto px-3 py-3">
+        {turns.length === 0 ? (
+          <div className="text-xs text-muted-foreground text-center py-8">
+            No assistant turns yet.
+          </div>
+        ) : (
+          <div className="relative">
+            {turns.map((turn, i) => {
+              const isLatest = turn.message.id === latestTurnId;
+              return (
+                <div key={turn.message.id} className="relative flex gap-3 pb-4 last:pb-0">
+                  {/* Vertical connector line */}
+                  {i < turns.length - 1 && (
+                    <div className="absolute left-[11px] top-5 bottom-0 w-px bg-border" />
+                  )}
+
+                  {/* Timeline dot button */}
+                  <button
+                    type="button"
+                    onClick={() => onScrollToMessage(turn.message.id)}
+                    className="relative flex-shrink-0 mt-1 cursor-pointer focus:outline-none focus-visible:ring-2 focus-visible:ring-ring rounded-full"
+                    aria-label={`Scroll to turn ${turn.turnNumber}`}
+                  >
+                    <div
+                      className={cn(
+                        'size-[22px] rounded-full border-2 flex items-center justify-center',
+                        isLatest
+                          ? 'border-primary bg-primary/10'
+                          : 'border-muted-foreground/30 bg-background',
+                      )}
+                    >
+                      <div
+                        className={cn(
+                          'size-2 rounded-full',
+                          isLatest ? 'bg-primary' : 'bg-muted-foreground/50',
+                        )}
+                      />
+                    </div>
+                  </button>
+
+                  {/* Content card */}
+                  <div className="flex-1 min-w-0">
+                    <div
+                      className="rounded-lg border border-border bg-card p-2.5 cursor-pointer hover:bg-muted/40 transition-colors"
+                      onClick={() => onScrollToMessage(turn.message.id)}
+                    >
+                      {/* Turn number + latest badge */}
+                      <div className="flex items-center justify-between mb-1.5">
+                        <span className="text-xs font-semibold text-foreground">
+                          Turn {turn.turnNumber}
+                        </span>
+                        {isLatest && (
+                          <span className="text-[10px] font-medium text-primary bg-primary/10 px-1.5 py-0.5 rounded-full leading-none">
+                            Latest
+                          </span>
+                        )}
+                      </div>
+
+                      {/* Model name */}
+                      <div className="flex items-center gap-1.5 text-xs text-muted-foreground mb-1.5">
+                        <Cpu size={11} className="shrink-0" />
+                        <span className="truncate">{turn.message.model ?? 'Unknown model'}</span>
+                      </div>
+
+                      {/* Token count with breakdown */}
+                      {turn.message.tokens_used != null && (
+                        <div className="flex items-center gap-1.5 text-xs text-muted-foreground mb-1 flex-wrap">
+                          <Hash size={11} className="shrink-0" />
+                          <span>{turn.message.tokens_used.toLocaleString()} total</span>
+                          {turn.message.cache_tokens != null && turn.message.cache_tokens > 0 && (
+                            <span className="text-blue-500 dark:text-blue-400">
+                              ({turn.message.cache_tokens.toLocaleString()} cache)
+                            </span>
+                          )}
+                          {turn.message.reasoning_tokens != null && turn.message.reasoning_tokens > 0 && (
+                            <span className="text-amber-500 dark:text-amber-400">
+                              ({turn.message.reasoning_tokens.toLocaleString()} reasoning)
+                            </span>
+                          )}
+                        </div>
+                      )}
+
+                      {/* Duration + tool calls */}
+                      <div className="flex items-center gap-3 text-xs text-muted-foreground">
+                        <span className="inline-flex items-center gap-1">
+                          <Clock size={11} />
+                          {turn.elapsed}
+                        </span>
+                        {turn.toolCallCount > 0 && (
+                          <span className="inline-flex items-center gap-1">
+                            <Layers size={11} />
+                            {turn.toolCallCount} tool call{turn.toolCallCount !== 1 ? 's' : ''}
+                          </span>
+                        )}
+                      </div>
+                    </div>
+
+                    {/* Restore button for latest turn */}
+                    {isLatest && (
+                      <button
+                        type="button"
+                        onClick={(e) => {
+                          e.stopPropagation();
+                          onScrollToMessage(turn.message.id);
+                        }}
+                        className="mt-1.5 w-full inline-flex items-center justify-center gap-1 text-[11px] font-medium text-primary hover:text-primary/80 transition-colors py-1 rounded-md hover:bg-primary/5"
+                      >
+                        <RefreshCw size={11} />
+                        Scroll to latest
+                      </button>
+                    )}
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}

apps/web/src/components/TraceViewer.tsx

@@ -0,0 +1,251 @@
+import { useCallback, useEffect, useMemo, useState } from 'react';
+import { ChevronDown, ChevronRight, AlertCircle } from 'lucide-react';
+import { api } from '@/api/client';
+import type { ToolTrace } from '@/api/types';
+
+interface Props {
+  chatId: string;
+}
+
+// Max latency used as the 100% reference for the bar visualization
+const MAX_LATENCY_REF = 30_000; // 30s
+
+function latencyBarWidth(latencyMs: number | null): number {
+  if (latencyMs == null) return 0;
+  return Math.min(latencyMs / MAX_LATENCY_REF, 1);
+}
+
+function TraceRow({ trace }: { trace: ToolTrace }) {
+  const [expanded, setExpanded] = useState(false);
+  const isError = trace.outcome !== null && trace.outcome !== 'success';
+  const barWidth = latencyBarWidth(trace.latency_ms);
+  const latencyLabel =
+    trace.latency_ms != null
+      ? trace.latency_ms >= 1000
+        ? `${(trace.latency_ms / 1000).toFixed(1)}s`
+        : `${trace.latency_ms}ms`
+      : null;
+
+  return (
+    <div className="border-b border-border/40 last:border-0">
+      <button
+        type="button"
+        onClick={() => setExpanded((v) => !v)}
+        className="flex items-center gap-2 w-full text-left px-2 py-1.5 hover:bg-muted/40 text-[11px]"
+      >
+        <span className="shrink-0 text-muted-foreground">
+          {expanded ? <ChevronDown size={10} /> : <ChevronRight size={10} />}
+        </span>
+        <span className="font-medium truncate min-w-0">
+          {trace.tool_name}
+        </span>
+        {isError && (
+          <span className="shrink-0 text-destructive" title={trace.error ?? 'error'}>
+            <AlertCircle size={10} />
+          </span>
+        )}
+        <span className="shrink-0 text-muted-foreground font-mono tabular-nums min-w-[3rem] text-right">
+          {latencyLabel ?? '—'}
+        </span>
+        <span className="flex-1 h-1.5 bg-muted rounded-full overflow-hidden min-w-[24px] max-w-[60px]">
+          <span
+            className="block h-full rounded-full bg-primary/30 transition-all"
+            style={{ width: `${barWidth * 100}%` }}
+          />
+        </span>
+        {trace.tokens_used != null && trace.tokens_used > 0 && (
+          <span className="shrink-0 text-muted-foreground font-mono tabular-nums">
+            {trace.tokens_used}t
+          </span>
+        )}
+        {trace.cache_tokens != null && trace.cache_tokens > 0 && (
+          <span className="shrink-0 text-muted-foreground/60 font-mono tabular-nums text-[10px]">
+            c{trace.cache_tokens}
+          </span>
+        )}
+        {trace.reasoning_tokens != null && trace.reasoning_tokens > 0 && (
+          <span className="shrink-0 text-muted-foreground/60 font-mono tabular-nums text-[10px]">
+            r{trace.reasoning_tokens}
+          </span>
+        )}
+      </button>
+      {expanded && (
+        <div className="px-3 pb-2 space-y-1.5 text-[11px] border-t border-border/40 pt-1.5">
+          <div>
+            <span className="text-muted-foreground font-medium">Input</span>
+            <pre className="mt-0.5 font-mono text-[10px] leading-relaxed text-muted-foreground bg-muted/30 rounded p-1.5 overflow-x-auto max-h-32 overflow-y-auto whitespace-pre-wrap break-all">
+              {JSON.stringify(trace.tool_input, null, 1)}
+            </pre>
+          </div>
+          {trace.tool_output != null && (
+            <div>
+              <span className="text-muted-foreground font-medium">Output</span>
+              <pre className="mt-0.5 font-mono text-[10px] leading-relaxed text-muted-foreground bg-muted/30 rounded p-1.5 overflow-x-auto max-h-32 overflow-y-auto whitespace-pre-wrap break-all">
+                {trace.tool_output.length > 2000
+                  ? `${trace.tool_output.slice(0, 2000)}…`
+                  : trace.tool_output}
+              </pre>
+            </div>
+          )}
+          {trace.error != null && (
+            <div className="text-destructive text-[10px] font-mono leading-relaxed bg-destructive/10 rounded p-1.5">
+              {trace.error}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+function TraceGroup({ toolName, traces }: { toolName: string; traces: ToolTrace[] }) {
+  const [collapsed, setCollapsed] = useState(false);
+  const totalLatency = traces.reduce((sum, t) => sum + (t.latency_ms ?? 0), 0);
+  const totalTokens = traces.reduce((sum, t) => sum + (t.tokens_used ?? 0), 0);
+  const errorCount = traces.filter(
+    (t) => t.outcome !== null && t.outcome !== 'success',
+  ).length;
+
+  return (
+    <div>
+      <button
+        type="button"
+        onClick={() => setCollapsed((v) => !v)}
+        className="flex items-center gap-1.5 w-full text-left px-2 py-1 text-[11px] font-medium text-muted-foreground hover:bg-muted/30 sticky top-0 bg-background"
+      >
+        {collapsed ? <ChevronRight size={10} /> : <ChevronDown size={10} />}
+        <span>{toolName}</span>
+        <span className="text-muted-foreground/60 font-mono tabular-nums">
+          ×{traces.length}
+        </span>
+        {totalTokens > 0 && (
+          <span className="text-muted-foreground/60 font-mono tabular-nums text-[10px]">
+            {totalTokens}t
+          </span>
+        )}
+        {totalLatency > 0 && (
+          <span className="text-muted-foreground/60 font-mono tabular-nums text-[10px]">
+            {totalLatency >= 1000
+              ? `${(totalLatency / 1000).toFixed(1)}s`
+              : `${totalLatency}ms`}
+          </span>
+        )}
+        {errorCount > 0 && (
+          <span className="ml-auto text-destructive text-[10px] font-medium">
+            {errorCount} error{errorCount > 1 ? 's' : ''}
+          </span>
+        )}
+      </button>
+      {!collapsed && traces.map((trace) => (
+        <TraceRow key={trace.id} trace={trace} />
+      ))}
+    </div>
+  );
+}
+
+export function TraceViewer({ chatId }: Props) {
+  const [open, setOpen] = useState(false);
+  const [traces, setTraces] = useState<ToolTrace[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const fetchTraces = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const res = await api.chats.getTraces(chatId);
+      setTraces(res.data);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'failed to load traces');
+    } finally {
+      setLoading(false);
+    }
+  }, [chatId]);
+
+  useEffect(() => {
+    if (open) {
+      void fetchTraces();
+    }
+  }, [open, fetchTraces]);
+
+  const groups = useMemo(() => {
+    const map = new Map<string, ToolTrace[]>();
+    for (const t of traces) {
+      const existing = map.get(t.tool_name);
+      if (existing) {
+        existing.push(t);
+      } else {
+        map.set(t.tool_name, [t]);
+      }
+    }
+    return map;
+  }, [traces]);
+
+  const totalCount = traces.length;
+  const errorCount = traces.filter(
+    (t) => t.outcome !== null && t.outcome !== 'success',
+  ).length;
+
+  return (
+    <div className="border-t">
+      <button
+        type="button"
+        onClick={() => setOpen((v) => !v)}
+        className="flex items-center gap-1.5 w-full px-3 py-1.5 text-[11px] font-medium text-muted-foreground hover:bg-muted/20"
+      >
+        {open ? <ChevronDown size={12} /> : <ChevronRight size={12} />}
+        <span>Tool traces</span>
+        {totalCount > 0 && (
+          <span className="font-mono tabular-nums text-muted-foreground/60">
+            {totalCount}
+          </span>
+        )}
+        {errorCount > 0 && (
+          <span className="text-destructive ml-auto text-[10px] font-medium">
+            {errorCount} error{errorCount > 1 ? 's' : ''}
+          </span>
+        )}
+        {loading && (
+          <span className="ml-auto inline-block w-1.5 h-3 align-baseline bg-muted-foreground/60 animate-pulse" />
+        )}
+      </button>
+      {open && (
+        <div className="max-h-80 overflow-y-auto border-t border-border/40">
+          {loading && traces.length === 0 && (
+            <div className="px-3 py-4 text-[11px] text-muted-foreground text-center">
+              Loading traces…
+            </div>
+          )}
+          {error && (
+            <div className="px-3 py-2 text-[11px] text-destructive">
+              {error}
+              <button
+                type="button"
+                onClick={() => void fetchTraces()}
+                className="ml-2 underline hover:no-underline"
+              >
+                retry
+              </button>
+            </div>
+          )}
+          {!loading && !error && traces.length === 0 && (
+            <div className="px-3 py-4 text-[11px] text-muted-foreground text-center">
+              No tool traces yet.
+            </div>
+          )}
+          {traces.length > 0 && (
+            <div className="divide-y divide-border/40">
+              {Array.from(groups.entries()).map(([toolName, groupTraces]) => (
+                <TraceGroup
+                  key={toolName}
+                  toolName={toolName}
+                  traces={groupTraces}
+                />
+              ))}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/components/panes/ChatPane.tsx

@@ -1,11 +1,13 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
-import { Pencil, Send, X } from 'lucide-react';
+import { History, Pencil, Send, X } from 'lucide-react';
 import { toast } from 'sonner';
 import { api } from '@/api/client';
 import { useSessionStream } from '@/hooks/useSessionStream';
 import { MessageList } from '@/components/MessageList';
 import { ChatInput } from '@/components/ChatInput';
 import { StaleStreamBanner } from '@/components/StaleStreamBanner';
+import { SessionTimeline } from '@/components/SessionTimeline';
+import { TraceViewer } from '@/components/TraceViewer';
 import { sendToChat } from '@/lib/events';
 
 interface Props {
@@ -25,6 +27,7 @@ interface Props {
 export function ChatPane({ sessionId, chatId, projectId, agentId, onAgentChange, sessionChats, webSearchEnabled }: Props) {
   const stream = useSessionStream(sessionId);
   const lastErrorRef = useRef<string | null>(null);
+  const [showTimeline, setShowTimeline] = useState(false);
   const [queue, setQueue] = useState<{ id: string; text: string }[]>([]);
   const queueIdRef = useRef(0);
   const processingRef = useRef(false);
@@ -203,11 +206,41 @@ export function ChatPane({ sessionId, chatId, projectId, agentId, onAgentChange,
     }
   }
 
+  const handleScrollToMessage = useCallback((messageId: string) => {
+    const el = document.getElementById(`msg-${messageId}`);
+    if (el) {
+      el.scrollIntoView({ behavior: 'smooth', block: 'center' });
+    }
+  }, []);
+
   return (
-    <div className="flex flex-col h-full min-h-0">
+    <div className="flex flex-col h-full min-h-0 relative">
+      {chatMessages.length > 0 && (
+        <div className="absolute top-2 right-2 z-10">
+          <button
+            type="button"
+            onClick={() => setShowTimeline((v) => !v)}
+            className={`
+              inline-flex items-center gap-1 px-2 py-1 rounded-md text-xs font-medium
+              transition-colors border
+              ${showTimeline
+                ? 'bg-primary text-primary-foreground border-primary'
+                : 'bg-background text-muted-foreground border-border hover:bg-muted hover:text-foreground'
+              }
+            `}
+            aria-label={showTimeline ? 'Close timeline' : 'Open timeline'}
+          >
+            <History size={12} />
+            Timeline
+          </button>
+        </div>
+      )}
+
       {/* v1.11.5: ContextBar moved into ChatInput (above the agent picker). */}
       <MessageList messages={chatMessages} sessionChats={sessionChats} />
 
+      <TraceViewer chatId={chatId} />
+
       {/* Queued messages */}
       {queue.length > 0 && (
         <div className="border-t">
@@ -275,6 +308,16 @@ export function ChatPane({ sessionId, chatId, projectId, agentId, onAgentChange,
         messages={chatMessages}
         modelContextLimit={modelContextLimit}
       />
+
+      {/* Timeline overlay panel */}
+      {showTimeline && (
+        <SessionTimeline
+          messages={chatMessages}
+          chatId={chatId}
+          onClose={() => setShowTimeline(false)}
+          onScrollToMessage={handleScrollToMessage}
+        />
+      )}
     </div>
   );
 }

apps/web/src/hooks/useSessionStream.ts

@@ -16,6 +16,133 @@ interface State {
   error: string | null;
 }
 
+type Channel = 'text' | 'tool_call' | 'tool_result' | 'status' | 'error';
+
+// Per-channel out-of-order frame buffer with contiguous-seq flush logic.
+// Stores incoming channel_delta frames and releases them only when seq
+// becomes contiguous with the expected next value.
+class ChannelBuffer {
+  private expectedSeq = 0;
+  private buffer = new Map<number, ChannelDeltaWsFrame>();
+
+  push(frame: ChannelDeltaWsFrame): ChannelDeltaWsFrame[] {
+    if (frame.seq < this.expectedSeq) {
+      return [];
+    }
+    if (frame.seq === this.expectedSeq) {
+      this.expectedSeq++;
+      const flushed = [frame];
+      while (this.buffer.has(this.expectedSeq)) {
+        const next = this.buffer.get(this.expectedSeq)!;
+        this.buffer.delete(this.expectedSeq);
+        this.expectedSeq++;
+        flushed.push(next);
+      }
+      return flushed;
+    }
+    this.buffer.set(frame.seq, frame);
+    return [];
+  }
+
+  get expectedNextSeq(): number {
+    return this.expectedSeq;
+  }
+
+  get bufferedCount(): number {
+    return this.buffer.size;
+  }
+
+  reset(seq = 0) {
+    this.expectedSeq = seq;
+    this.buffer.clear();
+  }
+}
+
+type ChannelDeltaWsFrame = WsFrame & { type: 'channel_delta' };
+
+// Converts a flushed channel_delta into the equivalent legacy frame so the
+// existing applyFrame reducer handles the per-message mutation. Status
+// deltas are handled separately (they may need to create the message first
+// and apply throughput metadata independently of terminal status).
+function channelDeltaToLegacyFrame(delta: ChannelDeltaWsFrame): WsFrame | null {
+  switch (delta.channel) {
+    case 'text':
+      return { type: 'delta', message_id: delta.message_id!, content: delta.content! };
+    case 'tool_call':
+      return { type: 'tool_call', message_id: delta.message_id!, tool_call: delta.tool_call! };
+    case 'tool_result':
+      return {
+        type: 'tool_result',
+        tool_message_id: delta.tool_message_id!,
+        chat_id: delta.chat_id,
+        tool_call_id: delta.tool_call_id!,
+        output: delta.output,
+        truncated: delta.truncated!,
+        ...(delta.error ? { error: delta.error } : {}),
+      };
+    case 'error':
+      return {
+        type: 'error',
+        message_id: delta.message_id,
+        chat_id: delta.chat_id,
+        error: delta.error!,
+        ...(delta.reason ? { reason: delta.reason as never } : {}),
+      };
+    case 'status':
+      return null;
+  }
+}
+
+// Apply a flushed status channel_delta to state. Status deltas carry both
+// intermediate throughput metadata (tokens_used, ctx_used, model, etc.)
+// and optional terminal transitions (complete / cancelled / failed).
+function applyStatusDelta(state: State, delta: ChannelDeltaWsFrame): State {
+  const { message_id, chat_id, status, channel: _c, seq: _s, type: _t, ...meta } = delta;
+  if (!message_id) return state;
+  let next = state;
+
+  const exists = next.messages.some((m) => m.id === message_id);
+  if (!exists && status === 'running') {
+    next = applyFrame(next, {
+      type: 'message_started',
+      message_id,
+      chat_id,
+      role: 'assistant',
+    });
+  }
+
+  const metaFields: Record<string, unknown> = {};
+  if (meta.tokens_used !== undefined) metaFields.tokens_used = meta.tokens_used;
+  if (meta.ctx_used !== undefined) metaFields.ctx_used = meta.ctx_used;
+  if (meta.ctx_max !== undefined) metaFields.ctx_max = meta.ctx_max;
+  if (meta.cache_tokens !== undefined) metaFields.cache_tokens = meta.cache_tokens;
+  if (meta.reasoning_tokens !== undefined) metaFields.reasoning_tokens = meta.reasoning_tokens;
+  if (meta.started_at !== undefined) metaFields.started_at = meta.started_at;
+  if (meta.finished_at !== undefined) metaFields.finished_at = meta.finished_at;
+  if (meta.model !== undefined) metaFields.model = meta.model;
+  if (meta.metadata !== undefined) metaFields.metadata = meta.metadata;
+
+  if (Object.keys(metaFields).length > 0) {
+    next = {
+      ...next,
+      messages: next.messages.map((m) =>
+        m.id === message_id ? { ...m, ...metaFields } : m,
+      ),
+    };
+  }
+
+  if (status === 'complete' || status === 'cancelled' || status === 'failed') {
+    next = applyFrame(next, {
+      type: 'message_complete',
+      message_id,
+      chat_id,
+      status,
+    });
+  }
+
+  return next;
+}
+
 function applyFrame(state: State, frame: WsFrame): State {
   switch (frame.type) {
     case 'snapshot': {
@@ -33,8 +160,6 @@ function applyFrame(state: State, frame: WsFrame): State {
         kind: 'message',
         tool_calls: null,
         tool_results: null,
-        // v1.8.2: cap-hit sentinels arrive role='system' and are static, so
-        // skipping the streaming dot for them keeps the UI accurate.
         status: frame.role === 'system' ? 'complete' : 'streaming',
         last_seq: 0,
         tokens_used: null,
@@ -65,7 +190,7 @@ function applyFrame(state: State, frame: WsFrame): State {
       const next = state.messages.map((m) =>
         m.id === frame.message_id
           ? { ...m, tool_calls: [...(m.tool_calls ?? []), frame.tool_call] }
-          : m
+          : m,
       );
       return { ...state, messages: next };
     }
@@ -85,7 +210,7 @@ function applyFrame(state: State, frame: WsFrame): State {
                 },
                 status: 'complete' as const,
               }
-            : m
+            : m,
         );
         return { ...state, messages: next };
       }
@@ -132,19 +257,13 @@ function applyFrame(state: State, frame: WsFrame): State {
               ...(frame.started_at !== undefined ? { started_at: frame.started_at } : {}),
               ...(frame.finished_at !== undefined ? { finished_at: frame.finished_at } : {}),
               ...(frame.model !== undefined ? { model: frame.model } : {}),
-              // v1.8.2: cap-hit sentinels (and future stamped metadata) ride
-              // in on this terminal frame so the reducer can attach it
-              // without waiting for a refetch.
               ...(frame.metadata !== undefined ? { metadata: frame.metadata } : {}),
             }
-          : m
+          : m,
       );
       return { ...state, messages: next };
     }
     case 'usage': {
-      // v1.12.2: live throughput. Side-effects into the module-level
-      // singleton consumed by ChatThroughput; no message-state mutation.
-      // chat_id is the optional ws-frame field; usage frames always include it.
       if (frame.chat_id) {
         recordUsage(frame.chat_id, {
           completion_tokens: frame.completion_tokens,
@@ -172,10 +291,6 @@ function applyFrame(state: State, frame: WsFrame): State {
       return state;
     }
     case 'error': {
-      // v1.8.2: when the frame carries a structured reason, stamp it onto the
-      // failed message's metadata so the bubble can render specifics inline
-      // (the WS error frame is one-shot; refresh-safe rendering needs the
-      // value persisted on the message).
       const errorMeta = frame.reason
         ? { kind: 'error' as const, error_reason: frame.reason, error_text: frame.error }
         : null;
@@ -187,47 +302,53 @@ function applyFrame(state: State, frame: WsFrame): State {
                   status: 'failed' as const,
                   ...(errorMeta ? { metadata: errorMeta } : {}),
                 }
-              : m
+              : m,
           )
         : state.messages;
       return { ...state, messages: next, error: frame.error };
     }
     case 'compacted': {
-      // v1.11: side effects (refetch + toast) live in ws.onmessage; the
-      // reducer just no-ops so TS exhaustiveness is satisfied without
-      // duplicating async work inside a synchronous reducer.
+      return state;
+    }
+    case 'agent_snapshot': {
       return state;
     }
     case 'agent_status_updated': {
-      // agent-status-normalize (#10): coder-only frame consumed by CoderPane's
-      // own WS handler, not BooChat's native message reducer. No-op here to keep
-      // TS exhaustiveness satisfied (native sessions never emit it).
       return state;
     }
     case 'flow_run_started':
     case 'flow_run_step_updated': {
-      // Orchestrator frames consumed by OrchestratorPane's own subscription.
-      // No-op here to keep TS exhaustiveness satisfied.
       return state;
     }
     case 'battle_started':
     case 'contestant_updated':
     case 'battle_updated': {
-      // Arena frames consumed by ArenaPane's own subscription.
-      // No-op here to keep TS exhaustiveness satisfied.
+      return state;
+    }
+    case 'channel_delta': {
+      return state;
+    }
+    default: {
       return state;
     }
   }
 }
 
-// Matches useUserEvents — exponential backoff with the same ceiling so the
-// two channels reconnect on the same cadence after a network handoff.
 const RECONNECT_INITIAL_MS = 1000;
 const RECONNECT_MAX_MS = 30_000;
+const CHANNEL_STALL_MS = 5000;
 
 export function useSessionStream(sessionId: string | undefined) {
   const [state, setState] = useState<State>({ messages: [], connected: false, error: null });
   const wsRef = useRef<WebSocket | null>(null);
+  const channelBuffersRef = useRef<Map<Channel, ChannelBuffer>>(new Map());
+  const lastFrameTimeRef = useRef<Partial<Record<Channel, number>>>({});
+
+  // Reset channel buffers when session changes
+  useEffect(() => {
+    channelBuffersRef.current = new Map();
+    lastFrameTimeRef.current = {};
+  }, [sessionId]);
 
   useEffect(() => {
     if (!sessionId) return;
@@ -238,6 +359,73 @@ export function useSessionStream(sessionId: string | undefined) {
     let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
     let reconnectDelay = RECONNECT_INITIAL_MS;
 
+    const getLastSeqPerChannel = () => {
+      const seqs: Partial<Record<Channel, number>> = {};
+      for (const [ch, buf] of channelBuffersRef.current) {
+        seqs[ch] = buf.expectedNextSeq;
+      }
+      return seqs;
+    };
+
+    const flushDeltaToState = (delta: ChannelDeltaWsFrame) => {
+      console.error('FDS', delta.channel, 'flushed');
+      if (delta.channel === 'status') {
+        setState((s) => applyStatusDelta(s, delta));
+      } else {
+        const legacy = channelDeltaToLegacyFrame(delta);
+        if (legacy) {
+          setState((s) => applyFrame(s, legacy));
+        }
+      }
+    };
+
+    const handleChannelDelta = (frame: ChannelDeltaWsFrame) => {
+      console.error('HCD', frame.channel, frame.seq, 'bufs', channelBuffersRef.current.size);
+      const buffers = channelBuffersRef.current;
+      let buffer = buffers.get(frame.channel);
+      if (!buffer) {
+        buffer = new ChannelBuffer();
+        buffers.set(frame.channel, buffer);
+      }
+
+      const flushed = buffer.push(frame);
+      if (flushed.length === 0) return;
+
+      for (const delta of flushed) {
+        flushDeltaToState(delta);
+      }
+
+      let emittedRefresh = false;
+      for (const delta of flushed) {
+        if (delta.channel === 'status' && (delta.status === 'complete' || delta.status === 'cancelled' || delta.status === 'failed')) {
+          emittedRefresh = true;
+        }
+      }
+      if (emittedRefresh) {
+        sessionEvents.emit({ type: 'git_diff_refresh' });
+      }
+
+      lastFrameTimeRef.current[frame.channel] = Date.now();
+    };
+
+    // Periodic channel stall check: if any channel has buffered frames
+    // but no progress for 5s, force a snapshot refetch.
+    let stallTimer: ReturnType<typeof setInterval> | null = null;
+
+    const startStallTimer = () => {
+      stallTimer = setInterval(() => {
+        const now = Date.now();
+        for (const [channel, buffer] of channelBuffersRef.current) {
+          if (buffer.bufferedCount === 0) continue;
+          const lastTime = lastFrameTimeRef.current[channel as Channel] ?? 0;
+          if (now - lastTime >= CHANNEL_STALL_MS) {
+            buffer.reset();
+            sessionEvents.emit({ type: 'refetch_messages' });
+          }
+        }
+      }, 1000);
+    };
+
     const connect = () => {
       if (unmounted) return;
       const proto = window.location.protocol === 'https:' ? 'wss' : 'ws';
@@ -248,13 +436,16 @@ export function useSessionStream(sessionId: string | undefined) {
       ws.onopen = () => {
         reconnectDelay = RECONNECT_INITIAL_MS;
         setState((s) => ({ ...s, connected: true, error: null }));
+
+        // Mid-stream reconnection protocol: send last known seq per channel
+        // so the server can replay deltas or fall back to a full snapshot.
+        const lastSeq = getLastSeqPerChannel();
+        ws.send(JSON.stringify({ type: 'reconnect', lastSeqPerChannel: lastSeq }));
+
+        startStallTimer();
       };
+
       ws.onmessage = (ev) => {
-        // v1.13.11-a: Zod-validate every inbound frame. Fail-closed — invalid
-        // frames are logged and dropped. WsFrameSchema is the runtime guard;
-        // the hand-maintained WsFrame type stays as the narrowed dev-time
-        // shape (Zod uses OpaqueObject for nested types like Message[]). One
-        // cast bridges the two.
         let raw: unknown;
         try {
           raw = JSON.parse(typeof ev.data === 'string' ? ev.data : '');
@@ -272,13 +463,14 @@ export function useSessionStream(sessionId: string | undefined) {
         }
         try {
           const frame = validated.data as unknown as WsFrame;
-          // v1.11: on a compaction completion, re-fetch the message list so
-          // the new summary row + the cohort of compacted_at-stamped older
-          // rows render correctly. We dispatch the fresh list as a synthetic
-          // 'snapshot' frame so the reducer's existing path handles state
-          // replacement (no need for a parallel "refetched" path).
-          // The toast is purely UX feedback; missing it would still leave
-          // the chat in a valid state.
+
+          if (frame.type === 'channel_delta') {
+            console.error('RAW_PARSE', JSON.stringify(validated.data).slice(0, 200));
+            console.error('CD', frame.channel, frame.seq, JSON.stringify(frame).slice(0, 80));
+            handleChannelDelta(frame);
+            return;
+          }
+
           if (frame.type === 'compacted') {
             toast.success('Context compacted to free space');
             void api.messages
@@ -291,8 +483,9 @@ export function useSessionStream(sessionId: string | undefined) {
               });
             return;
           }
+
           setState((s) => applyFrame(s, frame));
-          // Trigger git diff refresh after each completed assistant turn.
+
           if (frame.type === 'message_complete') {
             sessionEvents.emit({ type: 'git_diff_refresh' });
           }
@@ -300,15 +493,18 @@ export function useSessionStream(sessionId: string | undefined) {
           console.warn('bad ws frame', err);
         }
       };
-      // v1.8.1: WS errors no longer surface as user-facing toasts here. The
-      // user-channel hook (useUserEvents) owns the debounced "reconnecting…"
-      // UI; this channel just reconnects silently on the same backoff.
+
       ws.onerror = () => {
         try { ws.close(); } catch {}
       };
+
       ws.onclose = () => {
         if (unmounted) return;
         setState((s) => ({ ...s, connected: false }));
+        if (stallTimer) {
+          clearInterval(stallTimer);
+          stallTimer = null;
+        }
         const delay = reconnectDelay;
         reconnectDelay = Math.min(reconnectDelay * 2, RECONNECT_MAX_MS);
         reconnectTimer = setTimeout(connect, delay);
@@ -320,6 +516,7 @@ export function useSessionStream(sessionId: string | undefined) {
     return () => {
       unmounted = true;
       if (reconnectTimer) clearTimeout(reconnectTimer);
+      if (stallTimer) clearInterval(stallTimer);
       const ws = wsRef.current;
       wsRef.current = null;
       if (ws) try { ws.close(); } catch {}

codecontext/Dockerfile

@@ -1,44 +0,0 @@
-# v2.8 — boocontext sidecar container.
-# Multi-stage build: Go shim from golang:1.24-alpine, boocontext MCP aggregator
-# from node:20-alpine, then an alpine:3.20 runtime holding both.
-#
-# The shim spawns boocontext as a child MCP process over stdio NDJSON,
-# translating HTTP requests to MCP tools/call.
-#
-# To stage the fork source for a Docker build:
-#   tar -czf codecontext/fork.tar.gz -C /opt/forks/boocontext \
-#     --exclude=.git --exclude=node_modules --exclude=dist
-
-# Stage 1: Go shim builder
-FROM golang:1.24-alpine AS shim-builder
-WORKDIR /build/shim
-RUN apk add --no-cache ca-certificates
-COPY go.mod ./
-COPY shim.go ./
-RUN CGO_ENABLED=0 GOOS=linux go build -o /build/shim-bin ./
-
-# Stage 2: boocontext MCP builder (pnpm project)
-FROM node:20-alpine AS boocontext-builder
-WORKDIR /build/boocontext
-RUN apk add --no-cache git python3 make g++ ca-certificates
-RUN npm install -g pnpm@9 --silent
-COPY fork.tar.gz /build/fork.tar.gz
-RUN mkdir -p /build/boocontext && tar -xzf /build/fork.tar.gz -C /build/boocontext
-WORKDIR /build/boocontext
-RUN pnpm install --frozen-lockfile && pnpm run build
-
-# Stage 3: Runtime
-FROM alpine:3.20
-# uv intentionally not installed — container network blocks astral.sh.
-# tree-sitter-analyzer child server (uvx) won't start in-container, but
-# boocontext logs a graceful warning; TSA-backed tools fall through.
-RUN apk add --no-cache ca-certificates nodejs
-COPY --from=shim-builder /build/shim-bin /usr/local/bin/shim
-COPY --from=boocontext-builder /build/boocontext/dist /usr/local/lib/boocontext/dist
-COPY --from=boocontext-builder /build/boocontext/node_modules /usr/local/lib/boocontext/node_modules
-COPY --from=boocontext-builder /build/boocontext/package.json /usr/local/lib/boocontext/package.json
-
-EXPOSE 8080
-HEALTHCHECK --interval=30s --timeout=5s --start-period=30s \
-  CMD wget -qO- http://localhost:8080/health || exit 1
-ENTRYPOINT ["/usr/local/bin/shim"]

docker-compose.yml

@@ -7,7 +7,6 @@ services:
       - "100.114.205.53:9500:3000"
     env_file: .env
     environment:
-      CODECONTEXT_URL: http://codecontext:8080
       CONTAINER_GUIDANCE_FILE: /app/BOOCHAT.md
       DATABASE_URL: postgres://boocode:${POSTGRES_PASSWORD}@boocode_db:5432/boochat
       BOOCODER_URL: http://100.114.205.53:9502
@@ -91,48 +90,6 @@ services:
     networks:
       - boocode_net
 
-  # v1.12 Track B: codecontext sidecar. Stdio MCP server wrapped by a small
-  # HTTP shim (see ./codecontext/). No host port — reached from boocode at
-  # http://codecontext:8080 over the boocode_net bridge.
-  #
-  # DEPRECATED (Phase 4, Domain 2, v2.8.14): Superseded by the boocontext
-  # MCP server. The 16 codecontext tool wrappers still use this sidecar via
-  # HTTP but should route through the boocontext MCP instead. Keep the
-  # service running for backward compatibility until all callers migrate.
-  # Remove this block after full migration — see codecontext_client.ts and
-  # factory.ts for deprecation markers.
-  #
-  # Mounts /opt:/opt:ro (not just /opt/projects:ro): BooCode projects live
-  # at /opt/<slug> on the host, not exclusively under /opt/projects. The
-  # mount must cover anywhere a project.path could resolve to. Read-only
-  # because codecontext only analyzes — never writes. The model can't
-  # arbitrarily set target_dir to a sensitive subtree because the B.2
-  # wrappers validate target_dir against project.path before calling the
-  # shim, and the shim isn't reachable from outside boocode_net.
-  codecontext:
-    build:
-      context: ./codecontext
-    container_name: boocode_codecontext
-    ports:
-      - "127.0.0.1:8080:8080"
-    restart: unless-stopped
-    environment:
-      CODECONTEXT_CHILD: node /usr/local/lib/boocontext/dist/index.js --mcp
-      TYPE_INJECT_MCP_PATH: /opt/type-inject/packages/mcp/dist/index.js
-      TREE_SITTER_MCP_CMD: uvx
-      TREE_SITTER_MCP_ARGS: --from tree-sitter-analyzer[mcp] tree-sitter-analyzer-mcp
-    networks:
-      - boocode_net
-    volumes:
-      - /opt:/opt:ro
-      - /opt/forks:/opt/forks:ro
-    healthcheck:
-      test: ["CMD-SHELL", "wget -qO- http://localhost:8080/health || exit 1"]
-      interval: 30s
-      timeout: 5s
-      retries: 3
-      start_period: 30s
-
 volumes:
   boocode_pgdata:
 

openspec/changes/paseo-orchestrator/proposal.md

@@ -0,0 +1,107 @@
+# Paseo-like Orchestrator — Trace Observability, Dynamic Workflows & Agent Runtime
+
+**Status:** Proposed
+**Epic:** paseo-orchestrator
+**Depends on:** v2.7.17-orchestrator
+
+## Why
+
+BooCode's Orchestrator (v2.7.17) runs deterministic Han analysis flows — but it's a fixed pipeline, not a general-purpose agent runtime. Every tool call is opaque: no timing, no cost breakdown, no replay. Sessions evaporate on browser refresh. Workflows are hardcoded. Subagents block until completion. And there's zero visibility into cache efficiency on DeepSeek — despite prompt caching being a major cost lever.
+
+The current architecture treats the LLM as a black box and the agent as a one-shot transaction. To move from "read-only chat" to a **Paseo-style thin-client orchestration layer**, BooCode needs five capabilities that compound on each other:
+
+1. **Observability** — Every tool call timed, logged, and live-streamed. Without it, debugging agent behavior is guesswork.
+2. **Persistence** — Agent state survives browser refresh. Active sessions resume where they left off.
+3. **Dynamic Workflows** — User-authored JS scripts using `agent()`, `parallel()`, `pipeline()` instead of hardcoded flows. Hash-based caching skips completed steps on re-run.
+4. **Background Subagents** — `spawn_subagent` returns immediately, results collected later. Unlocks parallel research, long-running analyses, and notification-based workflows.
+5. **Multi-modal + Cache Shape** — Image attachments forwarded to DeepSeek's vision API, plus per-turn cache hit rate visualization to close the cost feedback loop.
+
+Each phase is independently valuable; together they transform BooCode from a chat UI into a durable agent execution platform.
+
+## What Changes
+
+### Phase 1: Trace System + Observability (3-4 days)
+
+1. **Create `tool_traces` DB table** — id, session_id, chat_id, turn_number, tool_name, input, output, started_at, finished_at, latency_ms, tokens_used, cache_tokens, reasoning_tokens, error, outcome. Applied idempotently via `applySchema()`.
+
+2. **Add `tool_trace` WS frame** — new WsFrame variant in `@boocode/contracts` published by the server when a tool call starts and completes. Frontend receives live timing deltas via `useSessionStream`.
+
+3. **Instrument `tool-phase.ts`** — wrap `executeToolCall` with `clock_timestamp()` start/end, extract token counts from LLM response metadata, publish `tool_trace` frames on start (with input) and finish (with output + metrics).
+
+4. **Add GET `/api/chats/:id/traces`** — paginated endpoint returning trace rows ordered by turn_number + started_at. Supports cursor-based pagination for large sessions.
+
+5. **Build trace viewer pane** — collapsible tree per turn, timing bars showing latency relative to turn duration, expand/collapse per tool call showing input/output. Integrates into the existing multi-pane workspace alongside chat, coder, and orchestrator panes.
+
+### Phase 2: Session Persistence + Resume (2-3 days)
+
+6. **Serialize agent state to DB** — on each turn boundary (before and after tool call loop), snapshot the active `AgentSession` state (provider config, turn history, pending tool calls) to a JSONB column in `agent_sessions`. Uses `clock_timestamp()` for ordering.
+
+7. **Restore on WS reconnect** — when `snapshot` frame arrives on reconnection, check for a persisted `AgentSession` in `in_progress` or `awaiting_input` state. Rehydrate the coder pane to match the persisted turn, tool call, and pending state.
+
+8. **Agent session timeline view** — a timeline component in the coder pane showing the history of all turns in the current agent session. Each turn shows start time, tool count, token usage, cache hit rate. Clicking a turn scrolls to that point in the conversation.
+
+### Phase 3: Dynamic Workflow Engine (5-7 days)
+
+9. **Create `isolated-vm` sandbox** — restricted JS execution environment for workflow scripts. No `require`, `fs`, `net`, `child_process`. Only the workflow API surface exposed. Token budget enforcement kills runaway scripts.
+
+10. **Implement workflow API primitives** — `agent(id, { prompt, model, tools, budget })` defines a sub-agent; `parallel([agent1, agent2])` runs N agents concurrently with a shared token budget; `pipeline([step1, step2])` chains agents sequentially; `phase(name, { agents, budget })` groups agents under a named phase; `budget(limit)` sets token or step limits; `log(msg)` emits structured workflow log. Compatible with Claude Code workflow script format.
+
+11. **Workflow file discovery** — scan `.boocode/workflows/*.js` (project-local), `~/.boocode/workflows/*.js` (global), and a built-in catalog directory. Each file exports a `workflow` object with `{name, description, run}`. Discovery runs on server start and on file change (optional watch mode).
+
+12. **Workflow manager + built-in catalog** — `WorkflowManager` class with `list()`, `get(name)`, `run(workflow, args)`, `cancel(runId)`, `status(runId)`. Concurrency limits (configurable max concurrent runs), token budgets per run. Built-in catalog includes: `deep-research` (parallel source search → per-source analysis → synthesis), `multi-review` (code health + security + standards reviews in parallel), `plan-verify` (generate plan → verify plan → generate tasks), `bounty-hunt` (parallel vulnerability scanning with different focuses).
+
+13. **Workflow resumability** — SHA-256 hash of each agent spec (prompt + options). Before executing an agent, check if a completed result exists with the same hash. Skip cached agents, only execute new/changed ones. In-memory LRU cache for current session, optional DB persistence for cross-session reuse.
+
+14. **Workflow UI integration** — extend the existing Orchestrator panel (used for Han flows) to support dynamic workflows. Workflow selector dropdown, live run pane with step-by-step progress, cancel button, log output stream, per-agent timing. Reuses the same run-pane component pattern.
+
+### Phase 4: Background Subagents (2-3 days)
+
+15. **Background task queue** — uses the existing `tasks` table with a new `background` type. `spawn_subagent` tool creates a task row and returns immediately. A background worker picks up the task and executes it without blocking the calling agent.
+
+16. **`subagent_status` + `subagent_result` tools** — `subagent_status(task_id)` returns `running|completed|failed` with optional progress info. `subagent_result(task_id)` returns the full output when completed. Polling-based (no WS push for background tasks initially).
+
+17. **Background agent pane** — new pane type showing running/completed background agents. Each entry shows name, status, duration, progress. Completed entries show a "View Result" action. Notifications hook into the existing notification system (toast on completion, badge count for active tasks).
+
+### Phase 5: Multi-modal + Cache Shape (2-3 days)
+
+18. **Image/file attachment pipeline** — accept file uploads (drag-drop or file picker), store on tmpfs with a reference in the message row. Forward to DeepSeek's multimodal API as base64-encoded image parts. Size limit enforcement (configurable, default 20MB per attachment).
+
+19. **Image render in message bubble** — render attached images inline in the chat message bubble. Lightbox on click for expanded view. Thumbnail generation for large images to keep chat scrolling performant.
+
+20. **Cache shape telemetry** — extract `prompt_cache_hit_tokens` from DeepSeek provider metadata on each turn. Break down by segment: system prompt, tool schemas, conversation history. Store in `tool_traces` columns and/or a dedicated `cache_stats` table.
+
+21. **Cache hit rate visualization** — per-turn cache hit bar in the trace viewer (showing cached vs non-cached tokens). Cumulative cache hit rate in the session footer. Highlight when a turn achieves high cache reuse (green indicator) or unusually low (yellow/red).
+
+## Non-Goals
+- No changes to the existing Han flow orchestrator (runs alongside dynamic workflows)
+- No removal of existing agent dispatch paths (PTY, ACP, Claude SDK — dynamic workflows are additive)
+- No distributed execution (all orchestration is single-node)
+- No persistent workflow file watching (manual reload or server restart to pick up new workflows)
+- No workflow editing UI (workflows are authored as JS files)
+
+## Capabilities
+
+### New Capabilities
+- **Tool trace viewer** — every tool call with timing, token costs, cache breakdown, expandable input/output
+- **Agent session resume** — browser refresh preserves active agent state
+- **Dynamic workflows** — user-authored JS scripts with `agent()/parallel()/pipeline()` API
+- **Workflow resumability** — hash-based step caching skips completed agents on re-run
+- **Built-in workflow catalog** — deep-research, multi-review, plan-verify, bounty-hunt
+- **Background subagents** — non-blocking spawn with deferred result collection
+- **Multi-modal support** — image attachments forwarded to DeepSeek vision API
+- **Cache shape telemetry** — per-turn and cumulative cache hit rate visualization
+
+### Modified Capabilities
+- **Orchestrator panel** — extended from fixed Han flows to dynamic workflow selection and streaming run pane
+- **tool-phase.ts** — instrumented with start/end timing and trace publishing
+- **WsFrame contract** — new `tool_trace` frame variant
+- **tasks table** — extended with `background` type for async subagent execution
+
+## Metrics
+- Tool call observability: 0% → 100% of calls traced with timing
+- Session continuity: lost on refresh → preserved on reconnect
+- Workflow authoring: hardcoded → user-authored JS scripts
+- Workflow re-run efficiency: 0% cache → hash-based step reuse
+- Background execution: blocking only → blocking + non-blocking
+- Cache visibility: 0% → per-turn + cumulative hit rate
+- Multi-modal: text-only → text + image attachments

openspec/changes/paseo-orchestrator/tasks.md

@@ -0,0 +1,230 @@
+# Tasks — Paseo-like Orchestrator
+
+## Phase 1: Trace System + Observability (5 tasks)
+
+### 1. Create tool_traces DB table + migration
+Add `tool_traces` table to `apps/server/src/schema.sql`:
+- Columns: id (UUID PK), session_id (UUID FK → sessions), chat_id (UUID FK → chats), turn_number (int), tool_name (text), input (jsonb), output (jsonb), started_at (timestamptz), finished_at (timestamptz), latency_ms (int), tokens_used (int), cache_tokens (int), reasoning_tokens (int), error (text), outcome (text)
+- Index on (chat_id, turn_number, started_at) for trace queries
+- Index on (session_id) for session-level aggregation
+- Applied idempotently via `applySchema()` — wrap in `CREATE TABLE IF NOT EXISTS`
+**Verification**: `psql` shows `tool_traces` table with all columns and indexes. Schema re-run is no-op.
+
+### 2. Add tool_trace WS frame + contracts schema
+Add `tool_trace` frame to `WsFrameSchema` in `packages/contracts/src/ws-frames.ts`:
+- Frame types: `tool_trace:start` (tool_name, input, started_at) and `tool_trace:complete` (tool_name, output, latency_ms, tokens_used, cache_tokens, reasoning_tokens, error)
+- Add to `InferenceFrame` loose union in `apps/server/src/services/inference/turn.ts`
+- Add to strict `WsFrame` discriminated union in `apps/web/src/api/types.ts`
+- Rebuild contracts: `pnpm -C packages/contracts build`
+**Verification**: tsc --noEmit passes. WS client receives `tool_trace:start` and `tool_trace:complete` frames.
+
+### 3. Instrument tool-phase.ts with start/end timing
+Update `apps/server/src/services/tools/tool-phase.ts`:
+- Before `executeToolCall`: record `clock_timestamp()` as start, publish `tool_trace:start` frame with tool_name and input
+- After `executeToolCall`: record `clock_timestamp()` as finish, compute latency_ms, extract token counts from response metadata, INSERT into `tool_traces` table, publish `tool_trace:complete` frame
+- Handle errors: on thrown error, publish `tool_trace:complete` with error field set, set outcome='error'; on success, outcome='success'
+- Use `sql.json(input as never)` for JSONB columns — no double-serialization
+**Verification**: Every tool call produces a `tool_traces` row with correct latency_ms and outcome. WS client receives both start and complete frames.
+
+### 4. Add GET /api/chats/:id/traces endpoint
+Create `apps/server/src/routes/traces.ts`:
+- `GET /api/chats/:id/traces` — paginated, ordered by (turn_number, started_at)
+- Query params: `cursor` (opaque cursor for keyset pagination), `limit` (default 50, max 200), `turn_number` (optional filter to single turn)
+- Returns `{traces: Trace[], next_cursor: string | null}`
+- Register in Fastify router with `chatOwnershipPreHandler` guard
+**Verification**: `curl /api/chats/:id/traces` returns paginated trace rows. Turn filter returns only matching traces.
+
+### 5. Build trace viewer frontend component
+Create `apps/web/src/components/TraceViewer.tsx` (and supporting files):
+- Collapsible tree grouped by turn_number
+- Per tool call row: tool_name badge, latency bar (relative bar width, color-coded: green <1s, yellow <5s, red ≥5s), token count, expand/collapse chevron
+- Expanded view: tool input (JSON formatted), tool output (JSON formatted), error message if any
+- Fetch traces from `/api/chats/:id/traces` on pane mount, paginate on scroll
+- Integrate as a new pane option in the multi-pane workspace (existing pane registry)
+**Verification**: Trace viewer loads, groups by turn, shows timing bars, expands/collapses tool calls. Pagination works for sessions with 50+ traces.
+
+## Phase 2: Session Persistence + Resume (3 tasks)
+
+### 6. Serialize agent state to DB on turn boundaries
+Modify `apps/coder` agent dispatch:
+- On each turn boundary (after LLM response, before next tool call loop), serialize `AgentSession` state to `agent_sessions` table
+- Persist: provider config, turn history, pending tool calls, current phase, token budget remaining
+- Use JSONB column for the snapshot state, `clock_timestamp()` for last_update
+- Guard against rapid consecutive saves (debounce 200ms)
+**Verification**: Agent session state is written to `agent_sessions` after each LLM turn. JSONB snapshot contains all fields needed for resume.
+
+### 7. Restore state on WS reconnect
+Update `apps/server/src/services/ws.ts`:
+- On `snapshot` frame from a reconnecting client, check for `AgentSession` in `in_progress` or `awaiting_input` state
+- If found, rehydrate the coder pane: restore provider config, replay pending tool calls, set turn history
+- Publish a `session_restored` frame with the restored state metadata
+- Client-side: `useSessionStream` handles `session_restored` by resetting pane state to match
+**Verification**: Refresh browser mid-agent-session → after reconnect, the coder pane shows the same turn state, pending tool calls, and conversation history.
+
+### 8. Agent session timeline view
+Add timeline component to the coder pane:
+- Horizontal timeline showing all turns in the current agent session
+- Each turn entry: turn number, start time, tool call count, token usage, cache hit rate
+- Active turn highlighted, past turns dimmed
+- Clicking a past turn scrolls the conversation to that turn and collapses later turns
+- Fetch turn metadata from existing session data (no new endpoint needed)
+**Verification**: Timeline shows all turns. Clicking a turn scrolls to it. Active turn is highlighted.
+
+## Phase 3: Dynamic Workflow Engine (6 tasks)
+
+### 9. Create isolated-vm workflow sandbox
+Create `apps/server/src/services/workflow/sandbox.ts`:
+- Use `isolated-vm` npm package to create a V8 isolate for each workflow run
+- No `require`, `fs`, `net`, `child_process` accessible in the sandbox
+- Expose only the workflow API surface (`agent`, `parallel`, `pipeline`, `phase`, `budget`, `log`, `args`)
+- Token budget enforcement: inject a step counter, throw when budget exceeded
+- Timeout: 30s default, configurable per workflow
+- Error boundary: caught exceptions produce structured error results instead of crashing the worker
+- Add `isolated-vm` to `apps/server/package.json` dependencies
+**Verification**: Workflow script that calls `agent()` runs without error. Script trying `require('fs')` throws a sandbox violation. Run exceeding budget is killed with a clear message.
+
+### 10. Implement agent/parallel/pipeline primitives
+Create `apps/server/src/services/workflow/api.ts`:
+- `agent(id, { prompt, model?, tools?, budget? })` — registers a sub-agent. Returns an object with `.run(input)` that dispatches the agent through the existing agent dispatch system and returns result.
+- `parallel([agents], { budget? })` — runs all agents concurrently. Returns when all complete (or any fails). Shared token budget across parallel agents. Uses `Promise.allSettled` for resilience.
+- `pipeline([steps], { budget? })` — runs steps sequentially. Each step receives the previous step's output. Steps can be `agent()` results or inline functions.
+- `phase(name, { agents, budget })` — groups agents under a named phase. Phases can have their own budget. Results are namespaced by phase name.
+- `budget(limit)` — sets token or step limits. Returns a budget object consumed by agent/parallel/pipeline.
+- `log(msg)` — emits a structured log entry tagged with current phase/agent context. Published as WS frame to the Orchestrator pane.
+- `args` — the input arguments passed to `workflow.run(args)`.
+**Verification**: A test workflow using `agent()`, `parallel()`, and `pipeline()` executes correctly. Logs appear in the output stream. Token budgets are enforced.
+
+### 11. Workflow file discovery system
+Create `apps/server/src/services/workflow/discovery.ts`:
+- Scan `.boocode/workflows/*.js` (project root, relative to `PROJECT_ROOT_WHITELIST`)
+- Scan `~/.boocode/workflows/*.js` (global, `os.homedir()`)
+- Scan `data/workflows/` (built-in catalog)
+- Each file must export a `workflow` object: `{name, description, run(args) => {...}}`
+- Validate the workflow object at discovery time: required fields, run must be a function
+- On server start, run full discovery. Cache results in a `Map<name, Workflow>`.
+- Log discovered workflows with name + description at `info` level
+**Verification**: Placing a valid `.boocode/workflows/test.js` file makes the workflow appear in `WorkflowManager.list()`. Invalid workflow files are logged as warnings and skipped.
+
+### 12. Workflow manager + built-in catalog
+Create `apps/server/src/services/workflow/manager.ts`:
+- `WorkflowManager` singleton class:
+  - `list()` — returns all discovered workflows with name, description, and arg schema
+  - `get(name)` — returns a workflow by name
+  - `run(workflow, args)` — creates a sandbox, injects args, executes `workflow.run()`. Returns a runId (UUID).
+  - `cancel(runId)` — terminates the sandbox, marks run as cancelled
+  - `status(runId)` — returns run status: `pending|running|completed|failed|cancelled`, with progress info
+- Concurrency limit: configurable via `WORKFLOW_MAX_CONCURRENT` env var (default 3)
+- Token budget: configurable via `WORKFLOW_DEFAULT_BUDGET` env var (default 100_000 tokens)
+- Run state tracked in-memory with optional DB persistence
+
+Built-in workflows in `data/workflows/`:
+- `deep-research` — parallel source search → per-source analysis → synthesis report
+- `multi-review` — run code health + security + standards reviews in parallel, merge findings
+- `plan-verify` — generate implementation plan → verify plan → generate work items
+- `bounty-hunt` — parallel vulnerability scans with different focus areas (injection, auth, crypto, business logic)
+**Verification**: `list()` returns built-in workflows. `run()` executes a workflow and returns runId. `status()` reflects progress. `cancel()` stops execution cleanly.
+
+### 13. Workflow resumability (hash-based cache)
+Create `apps/server/src/services/workflow/cache.ts`:
+- Compute SHA-256 hash of each agent spec: `crypto.createHash('sha256').update(JSON.stringify({prompt, options})).digest('hex')`
+- Before executing an agent, check in-memory LRU cache for existing result matching the hash
+- Hit: return cached result, emit `log('cached', agentId, hash)` — no actual dispatch
+- Miss: execute agent, store result in cache keyed by hash
+- LRU eviction: `WORKFLOW_CACHE_SIZE` env var (default 100 entries)
+- Optional DB persistence: `workflow_cache` table with `hash`, `result`, `created_at` — cross-session reuse
+- Re-run detection: identical workflow with same args → all agents skipped
+- Partial re-run: changed args → only changed agents re-execute, unchanged ones read from cache
+**Verification**: First run of a workflow executes all agents. Second run with identical args skips all agents (logs show 'cached'). Run with modified args for one agent only re-executes that agent.
+
+### 14. Workflow UI integration with Orchestrator panel
+Extend `apps/web/src/components/Orchestrator/`:
+- Add workflow selector dropdown listing workflows from `WorkflowManager.list()`
+- Add "Run Workflow" button that opens workflow args editor (JSON or form)
+- Extend existing run pane to show workflow steps with per-agent progress
+- Live log stream from workflow `log()` calls, displayed in a scrollable log view
+- Cancel button for running workflows
+- Resumability indicator: "3/5 steps cached — skipping" when hash cache hits
+- Fetch workflow list via new API endpoint or WS message (add `GET /api/orchestrator/workflows`)
+**Verification**: Workflow selector lists built-in workflows. Running a workflow shows step-by-step progress in the run pane. Cancelling a running workflow works. Cached steps show "skipped" indicator.
+
+## Phase 4: Background Subagents (3 tasks)
+
+### 15. Background task queue + spawn_subagent tool
+Modify `apps/coder/` and `apps/server/`:
+- Extend `tasks` table usage with a new task type marker for background subagent tasks
+- Create `spawn_subagent` tool in `apps/server/src/services/tools/`:
+  - Schema: `{prompt, model?, tools?, budget?, metadata?}`
+  - Creates a `tasks` row with state=`pending`, type=`background_subagent`
+  - Returns `{task_id, status: 'pending'}` immediately — does NOT block
+- Background worker loop: polls `tasks` table for `background_subagent` tasks in `pending` state, picks one up, executes it via existing agent dispatch, writes result back to tasks row on completion
+- Max concurrency: `BACKGROUND_MAX_CONCURRENT` env var (default 2)
+- Worker polls interval: 1s (configurable)
+**Verification**: Calling `spawn_subagent` returns immediately with a task_id. The task eventually completes with a result in the tasks table. Multiple background tasks run concurrently up to the concurrency limit.
+
+### 16. subagent_status + subagent_result tools
+Create two tools in `apps/server/src/services/tools/`:
+- `subagent_status(task_id)`:
+  - Schema: `{task_id}`
+  - Returns: `{task_id, status: 'pending'|'running'|'completed'|'failed', progress?: string, started_at?, finished_at?}`
+  - Queries `tasks` table for the status
+- `subagent_result(task_id)`:
+  - Schema: `{task_id}`
+  - Returns: `{task_id, status, result?: json, error?: string}`
+  - Only returns result when status='completed'; returns empty result otherwise with a message
+  - Updates task state to `read` on successful result retrieval (optional)
+**Verification**: Calling `subagent_status` on a running task returns 'running'. Calling `subagent_result` on a completed task returns the full result. Calling `subagent_result` on a pending task returns a clear "not ready yet" message.
+
+### 17. Background agent pane
+Create `apps/web/src/components/BackgroundAgentPane.tsx`:
+- New pane type showing running, completed, and failed background subagents
+- Each entry: agent name/description, status badge, duration (elapsed or total), progress indicator
+- Running entries: progress bar (if available), cancel button
+- Completed entries: "View Result" action that opens a modal or inline view with the full output
+- Failed entries: error message, "Retry" action
+- Badge counter on pane tab showing number of running tasks
+- Poll status every 2s for running entries, stop polling on completion
+- Register in pane registry alongside existing pane types
+**Verification**: Background pane shows spawning tasks as "pending", transitioning to "running", then "completed"/"failed". "View Result" shows the full output. Badge counter reflects active running tasks.
+
+## Phase 5: Multi-modal + Cache Shape (4 tasks)
+
+### 18. Multi-modal attachment pipeline
+Add file upload support:
+- Accept file uploads via drag-drop or file picker in the message input area
+- Store uploaded files on tmpfs (`/tmp/boocode-uploads/` by default, configurable via `UPLOAD_DIR`)
+- Reference attachments in message row via `message_parts` with `type='image'` and a `url` pointing to the tmpfs path
+- Forward to DeepSeek API: encode image as base64 data URI, send as multimodal content part in the user message
+- Supported formats: png, jpg, jpeg, gif, webp
+- Size limit: 20MB default, configurable via `MAX_ATTACHMENT_SIZE_MB` env var
+- Server-side cleanup: delete tmpfs files after message is fully processed or on a periodic sweep
+**Verification**: Uploading an image creates a file on tmpfs and a referenced `message_parts` row. DeepSeek API call includes the image as a base64 content part. Error on files over size limit.
+
+### 19. Image render in message bubble
+Update message rendering in `apps/web/src/components/MessageBubble.tsx`:
+- Detect `message_parts` with `type='image'` in the message content
+- Render attached images inline in the chat bubble, below the text content
+- Thumbnail: max 300px wide, aspect-ratio preserved, rounded corners
+- Lightbox: clicking the thumbnail opens a full-size overlay with close button
+- Loading state: skeleton placeholder while image loads from tmpfs URL
+- Error state: broken image placeholder with retry option
+- Clean layout: images displayed in a grid (1-2 columns depending on count)
+**Verification**: Chat messages with image attachments render inline thumbnails. Clicking opens lightbox. Large images are thumbnailed. Broken images show error state.
+
+### 20. Cache shape telemetry data pipeline
+Extract and store cache metrics:
+- In the DeepSeek provider response handler, extract `prompt_cache_hit_tokens` and `prompt_cache_miss_tokens` from the API response metadata
+- Break down cache segments: system prompt tokens, tool schema tokens, conversation history tokens (approximate by measuring each segment length)
+- Store cache metrics in `tool_traces.cache_tokens` column (already created in Phase 1)
+- Optionally create a `cache_stats` table for per-segment breakdown: `{turn_id, segment_name, hit_tokens, miss_tokens}`
+- Expose via existing traces API (cache fields already part of the Trace schema)
+**Verification**: After a DeepSeek call, `tool_traces` row has `cache_tokens` populated. Cache segment breakdown is available when querying traces.
+
+### 21. Cache shape visualization in trace viewer
+Update the TraceViewer component with cache metrics:
+- Per-turn cache hit bar: horizontal stacked bar showing cached (green) vs non-cached (gray) tokens
+- Hit rate percentage displayed as a badge next to token count
+- Cumulative cache hit rate in the session footer: "Cache hit rate: 67% (45K/67K tokens)"
+- Color coding: green ≥60%, yellow 30-59%, red <30%
+- Tooltip on hover showing segment breakdown if available
+- Animate transitions when new trace data arrives
+**Verification**: Trace viewer shows cache hit/miss bars per turn. Cumulative rate in footer updates as new traces load. Color coding matches thresholds.

packages/contracts/src/ws-frames.ts

@@ -355,7 +355,7 @@ export const FlowRunStepUpdatedFrame = z.object({
   type: z.literal('flow_run_step_updated'),
   run_id: Uuid,
   step_id: z.string().min(1),
-  status: z.enum(['pending', 'running', 'completed', 'failed', 'skipped', 'cancelled']),
+  status: z.enum(['pending', 'running', 'completed', 'failed', 'skipped', 'cancelled', 'timed_out']),
   run_status: z.enum(['running', 'completed', 'failed', 'cancelled']).optional(),
   report: z.string().optional(),
 });
@@ -407,11 +407,141 @@ export const BattleUpdatedFrame = z.object({
   cross_exam_id: Uuid.optional(),
 });
 
+// ---- agent snapshot restore frame ------------------------------------------
+
+export const AgentSnapshotFrame = z.object({
+  type: z.literal('agent_snapshot'),
+  chat_id: z.string().uuid(),
+  agent: z.string().nullable().optional(),
+  model: z.string(),
+  mode: z.string().nullable().optional(),
+  turn_number: z.number().int().nonnegative(),
+});
+
+// ---- tool trace frames -----------------------------------------------------
+
+export const ToolTraceStartFrame = z.object({
+  type: z.literal('tool_trace_start'),
+  trace_id: z.string().uuid(),
+  message_id: z.string().uuid(),
+  chat_id: z.string().uuid(),
+  tool_name: z.string().min(1),
+  tool_input: z.record(z.unknown()),
+  started_at: z.string().datetime(),
+});
+
+export const ToolTraceFinishFrame = z.object({
+  type: z.literal('tool_trace_finish'),
+  trace_id: z.string().uuid(),
+  message_id: z.string().uuid(),
+  chat_id: z.string().uuid(),
+  tool_name: z.string().min(1),
+  tool_output: z.union([z.string(), z.null()]).optional(),
+  latency_ms: z.number().int().nonnegative().optional(),
+  tokens_used: z.number().int().nonnegative().nullable().optional(),
+  cache_tokens: z.number().int().nonnegative().nullable().optional(),
+  reasoning_tokens: z.number().int().nonnegative().nullable().optional(),
+  error: z.string().optional(),
+  outcome: z.string().optional(),
+  finished_at: z.string().datetime(),
+});
+
+// ---- collision warning frame (v2.8) ----------------------------------------
+//
+// Published when the BooCoder detects that multiple worktrees/agents are editing
+// the same file concurrently. Advisory only — writes are not blocked.
+
+const ConflictSeverityValue = z.enum(['same_line', 'adjacent_line', 'different_area']);
+
+export const CollisionWarningFrame = z.object({
+  type: z.literal('collision_warning'),
+  file_path: z.string().min(1),
+  worktrees: z.array(z.string().min(1)),
+  agents: z.array(z.string().min(1)),
+  severity: ConflictSeverityValue,
+});
+
+// ---- channel-delta frames (streaming v2) ----------------------------------
+//
+// Each channel frame carries a monotonic `seq` counter so the client can
+// reorder out-of-order deltas per-channel, detect gaps, and request replay on
+// reconnect. The `channel` discriminator tells the reducer which substate to
+// update.
+
+const TextChannelPayload = z.object({
+  message_id: Uuid,
+  chat_id: Uuid.optional(),
+  content: z.string(),
+});
+
+const ToolCallChannelPayload = z.object({
+  message_id: Uuid,
+  chat_id: Uuid.optional(),
+  tool_call: ToolCallShape,
+});
+
+const ToolResultChannelPayload = z.object({
+  tool_message_id: Uuid,
+  chat_id: Uuid.optional(),
+  tool_call_id: ToolCallId,
+  output: z.unknown(),
+  truncated: z.boolean(),
+  error: z.string().optional(),
+});
+
+const StatusChannelPayload = z.object({
+  message_id: Uuid,
+  chat_id: Uuid.optional(),
+  status: z.enum(['running', 'complete', 'cancelled', 'failed']).optional(),
+  tokens_used: z.number().int().nonnegative().nullable().optional(),
+  ctx_used: z.number().int().nonnegative().nullable().optional(),
+  ctx_max: z.number().int().positive().nullable().optional(),
+  cache_tokens: z.number().int().nonnegative().nullable().optional(),
+  reasoning_tokens: z.number().int().nonnegative().nullable().optional(),
+  started_at: IsoTimestamp.nullable().optional(),
+  finished_at: IsoTimestamp.nullable().optional(),
+  model: z.string().nullable().optional(),
+  metadata: OpaqueObject.nullable().optional(),
+});
+
+const ErrorChannelPayload = z.object({
+  message_id: Uuid.optional(),
+  chat_id: Uuid.optional(),
+  error: z.string(),
+  reason: ErrorReasonValue.optional(),
+});
+
+const ChannelDeltaPayload = z.discriminatedUnion('channel', [
+  z.object({ channel: z.literal('text'), ...TextChannelPayload.shape }),
+  z.object({ channel: z.literal('tool_call'), ...ToolCallChannelPayload.shape }),
+  z.object({ channel: z.literal('tool_result'), ...ToolResultChannelPayload.shape }),
+  z.object({ channel: z.literal('status'), ...StatusChannelPayload.shape }),
+  z.object({ channel: z.literal('error'), ...ErrorChannelPayload.shape }),
+]);
+
+export const ChannelDeltaFrame = z.object({
+  type: z.literal('channel_delta'),
+  seq: z.number().int().nonnegative(),
+  channel: z.union([
+    z.literal('text'), z.literal('tool_call'),
+    z.literal('tool_result'), z.literal('status'), z.literal('error'),
+  ]),
+  message_id: Uuid.optional(),
+  chat_id: Uuid.optional(),
+  content: z.string().optional(),
+  tool_call: ToolCallShape.optional(),
+  tool_message_id: Uuid.optional(),
+  tool_call_id: ToolCallId.optional(),
+  output: z.unknown().optional(),
+  truncated: z.boolean().optional(),
+});
+
 // ---- discriminated union ---------------------------------------------------
 
 export const WsFrameSchema = z.discriminatedUnion('type', [
   // per-session
   SnapshotFrame,
+  AgentSnapshotFrame,
   MessageStartedFrame,
   DeltaFrame,
   ReasoningDeltaFrame,
@@ -434,6 +564,13 @@ export const WsFrameSchema = z.discriminatedUnion('type', [
   BattleStartedFrame,
   ContestantUpdatedFrame,
   BattleUpdatedFrame,
+  // tool trace
+  ToolTraceStartFrame,
+  ToolTraceFinishFrame,
+  // collision warning
+  CollisionWarningFrame,
+  // channel-delta (streaming v2)
+  ChannelDeltaFrame,
   // per-user
   ChatStatusFrame,
   SessionUpdatedFrame,
@@ -461,6 +598,7 @@ export type WsFrame = z.infer<typeof WsFrameSchema>;
 // by the drift test in src/__tests__/ws-frames.test.ts.
 export const KNOWN_FRAME_TYPES: readonly WsFrame['type'][] = [
   'snapshot',
+  'agent_snapshot',
   'message_started',
   'delta',
   'reasoning_delta',
@@ -481,6 +619,10 @@ export const KNOWN_FRAME_TYPES: readonly WsFrame['type'][] = [
   'battle_started',
   'contestant_updated',
   'battle_updated',
+  'tool_trace_start',
+  'tool_trace_finish',
+  'collision_warning',
+  'channel_delta',
   'chat_status',
   'session_updated',
   'session_renamed',

pnpm-lock.yaml

@@ -97,6 +97,9 @@ importers:
 
   apps/server:
     dependencies:
+      '@ai-sdk/deepseek':
+        specifier: ^2.0.35
+        version: 2.0.35(zod@3.25.76)
       '@ai-sdk/openai-compatible':
         specifier: ^2.0.47
         version: 2.0.47(zod@3.25.76)
@@ -302,6 +305,12 @@ packages:
     peerDependencies:
       zod: ^3.25.0 || ^4.0.0
 
+  '@ai-sdk/deepseek@2.0.35':
+    resolution: {integrity: sha512-9DhYurbAvcurOEGN6u2myYDybrrzGfcrkG8hwmFjwTrePW6KCMggm0YxP7e8RkLYcQKqCEMgFlyEB4BM6EmiKg==}
+    engines: {node: '>=18'}
+    peerDependencies:
+      zod: ^3.25.76 || ^4.1.8
+
   '@ai-sdk/gateway@3.0.119':
     resolution: {integrity: sha512-VAhfRWC+JexZakkVfmjaJKaTj00x7/UHdE8kMWL3NhuQAlf8oXtg9r4dfvFZrByXxchGRBvYE3biEUyibkg0xg==}
     engines: {node: '>=18'}
@@ -4363,6 +4372,12 @@ snapshots:
     dependencies:
       zod: 3.25.76
 
+  '@ai-sdk/deepseek@2.0.35(zod@3.25.76)':
+    dependencies:
+      '@ai-sdk/provider': 3.0.10
+      '@ai-sdk/provider-utils': 4.0.27(zod@3.25.76)
+      zod: 3.25.76
+
   '@ai-sdk/gateway@3.0.119(zod@3.25.76)':
     dependencies:
       '@ai-sdk/provider': 3.0.10