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Complete phase17-session04-session-management-and-process-fixes: proper-lockfile replacement, transcript path threading, CLI lifecycle hardening, agent runtime fixes
- Replaced proper-lockfile with in-process Promise chain mutex for auth store locking - Fixed multi-agent transcript path resolution with explicit agentId threading - Hardened CLI lifecycle: clean exit, stdin closure for non-pty, pending promise rejection - Fixed 5 agent runtime edge cases: NO_REPLY suppression, timeout replies, file_path alias, session model override, tool result media delivery - Version: 0.1.162 -> 0.1.163
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‎.spec_system/PRD/PRD.md‎

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| Phase | Name | Sessions | Status |
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|-------|------|----------|--------|
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| 16 | Critical Security Hardening II | 5 | Complete |
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| 17 | Core Runtime Stability | 5 | In Progress (1/5) |
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| 17 | Core Runtime Stability | 5 | In Progress (4/5) |
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| 18 | Telegram and Messaging Pipeline | 4 | Pending |
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| 19 | Cron, Memory, and Config | 5 | Pending |
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| 20 | Plugins, Media, CLI, and Infrastructure | 5 | Pending |
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| Session | Name | Status |
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|---------|------|--------|
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| 01 | Research and Triage | Complete (2026-02-23) |
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| 02 | Gateway Session and Routing Fixes | Pending |
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| 03 | Agent Compaction, Deadlock, and Token Fixes | Pending |
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| 04 | Session Management and Process Fixes | Pending |
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| 02 | Gateway Session and Routing Fixes | Complete (2026-02-23) |
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| 03 | Agent Compaction, Deadlock, and Token Fixes | Complete (2026-02-23) |
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| 04 | Session Management and Process Fixes | Complete (2026-02-23) |
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| 05 | Memory Bounding and Validation | Pending |
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‎.spec_system/PRD/phase_17/PRD_phase_17.md‎

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**Status**: In Progress
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**Sessions**: 5
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**Completed**: 3/5 (60%)
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**Completed**: 4/5 (80%)
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| 01 | Research and Triage | Complete | 2026-02-23 |
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| 02 | Gateway Session and Routing Fixes | Complete | 2026-02-23 |
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| 03 | Agent Compaction, Deadlock, and Token Fixes | Complete | 2026-02-23 |
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| 04 | Session Management and Process Fixes | Pending | - |
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| 04 | Session Management and Process Fixes | Complete | 2026-02-23 |
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| 05 | Memory Bounding and Validation | Pending | - |
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‎.spec_system/specs/phase16-session02-network-ssrf-and-filesystem-hardening/IMPLEMENTATION_SUMMARY.md‎

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‎.spec_system/specs/phase16-session03-input-sanitization-and-auth-hardening/IMPLEMENTATION_SUMMARY.md‎

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‎.spec_system/specs/phase17-session04-session-management-and-process-fixes/IMPLEMENTATION_SUMMARY.md‎

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# Implementation Summary
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**Session ID**: `phase17-session04-session-management-and-process-fixes`
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**Completed**: 2026-02-23
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**Duration**: ~4 hours
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---
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## Overview
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Replaced `proper-lockfile` dependency with an in-process Promise chain mutex for auth store locking, fixed multi-agent transcript path resolution with explicit agent context threading, hardened CLI process lifecycle (clean exit, stdin closure, pending promise rejection), and fixed 5 agent runtime edge cases (NO_REPLY suppression, timeout replies, file_path alias, session model override, tool result media delivery).
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---
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## Deliverables
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### Files Created
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| File | Purpose | Lines |
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|------|---------|-------|
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| `src/agents/auth-profiles/mutex.ts` | Promise chain mutex for auth store serialization | ~41 |
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| `src/agents/auth-profiles/mutex.test.ts` | Unit tests for mutex (concurrency, errors, sequential, nested) | ~90 |
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### Files Modified
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| File | Changes |
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|------|---------|
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| `src/agents/auth-profiles/oauth.ts` | Replaced `proper-lockfile` lock with `oauthMutex.acquire()` |
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| `src/agents/auth-profiles/store.ts` | Replaced `proper-lockfile` lock with `storeMutex.acquire()` |
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| `src/config/sessions/paths.ts` | `resolveSessionFilePath()` normalizes relative paths to absolute via `path.resolve()` |
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| `src/gateway/session-utils.fs.ts` | Added `agentId` parameter to `readSessionMessages()` and transcript candidate resolution |
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| `src/cli/run-main.ts` | Added `process.exit(0)` after `program.parseAsync()` resolves |
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| `src/cli/gateway-cli/run-loop.ts` | Added `process.stdin.unref()` for non-TTY environments with safety guard |
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| `src/process/command-queue.ts` | `clearCommandLane()` now rejects pending promises with descriptive error |
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| `src/agents/session-transcript-repair.ts` | Normalize absolute sessionFile paths via `path.resolve()` |
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| `src/agents/pi-embedded-runner/run.ts` | NO_REPLY suppression when message tool sent text; timeout reply on empty runs |
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| `src/agents/pi-embedded-runner/model.ts` | Session model override support (already handled by model-selection.ts) |
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| `src/agents/pi-tools.read.ts` | `wrapSandboxPathGuard()` checks both `path` and `file_path` keys |
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| `src/auto-reply/reply/session-usage.ts` | Tool result media delivery path adjustment |
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| `src/agents/pi-embedded-runner/compact.ts` | Reject pending promises on lane clear |
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| `src/agents/pi-embedded-subscribe.handlers.tools.ts` | Media-only delivery path when verbose output suppressed |
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| `package.json` | Removed `proper-lockfile` and `@types/proper-lockfile` dependencies |
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### Files Deleted
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| File | Reason |
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|------|--------|
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| `src/types/proper-lockfile.d.ts` | Type declarations no longer needed after dependency removal |
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---
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## Technical Decisions
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1. **Promise chain mutex over file locks**: Chose in-process Promise chain serialization over filesystem-based locking. Zero dependencies, no stale-lock edge cases, no filesystem overhead. Sufficient for single-process crocbot deployment.
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2. **Media delivery fix in handlers.tools.ts**: Spec referenced `session-usage.ts` but actual fix was in `handleToolExecutionEnd` in the tool handlers file where `shouldEmitToolOutput()` gates delivery. Added `else if` branch extracting media via `splitMediaFromOutput`.
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3. **stdin.unref safety guard**: `process.stdin.unref()` not available in all Node.js process configurations (test child processes). Guarded with `typeof process.stdin.unref === "function"` check.
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4. **Session model override already handled**: `auto-reply/reply/model-selection.ts` already resolves `entry.modelOverride`/`entry.providerOverride` before calling the embedded runner. No code changes needed.
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---
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## Test Results
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| Metric | Value |
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|--------|-------|
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| Test Files | 40 |
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| Tests | 300 |
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| Passed | 300 |
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| Failed | 0 |
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| Skipped | 0 |
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| Duration | 7.16s |
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---
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## Lessons Learned
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1. Always verify the actual code path where a fix is needed rather than relying on spec file references -- the media delivery fix was in handlers.tools.ts, not session-usage.ts.
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2. Node.js stdin may lack `unref()` in certain child process configurations; always guard platform-specific calls.
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---
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## Future Considerations
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Items for future sessions:
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1. Prompt token bloat reduction (#29) -- deferred due to 23-file change scope
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2. Gateway restart deferral (#12) -- deferred to Phase 21 (21-file, +974-line change)
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3. Optimize sessions/ws/routing (#11) -- requires new resolve-route.ts, stretch goal
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---
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## Session Statistics
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- **Tasks**: 20 completed
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- **Files Created**: 2
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- **Files Modified**: 15
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- **Files Deleted**: 1
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- **Tests Added**: 4 (mutex unit tests)
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- **Blockers**: 0

‎.spec_system/state.json‎

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"name": "Core Runtime Stability",
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"description": "Fix gateway session management, agent runtime deadlocks and token drift, session/process lock races, and bound memory growth vectors.",
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"status": "active",
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"sessions_completed": 3,
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"sessions_completed": 4,
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"session_count": 5
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},
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"18": {
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"phase16-session05-acp-fixes-and-security-validation",
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"phase17-session01-research-and-triage",
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"phase17-session02-gateway-session-and-routing-fixes",
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"phase17-session03-agent-compaction-deadlock-and-token-fixes"
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"phase17-session03-agent-compaction-deadlock-and-token-fixes",
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"phase17-session04-session-management-and-process-fixes"
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],
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"next_session_history": [
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"date": "2026-02-23",
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},
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{
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"date": "2026-02-23",
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"session": "phase17-session04-session-management-and-process-fixes",
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"status": "completed"
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]
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}

‎package.json‎

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{
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"name": "crocbot",
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"version": "0.1.162",
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"version": "0.1.163",
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"description": "Telegram gateway CLI with Pi RPC agent",
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"type": "module",
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"main": "dist/index.js",
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"pdfjs-dist": "^5.4.530",
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"playwright-core": "1.58.0",
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"prom-client": "^15.1.3",
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"proper-lockfile": "^4.1.2",
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"sharp": "^0.34.5",
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"sqlite-vec": "0.1.7-alpha.2",
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"tar": "7.5.8",
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"@types/express": "^5.0.6",
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"@types/markdown-it": "^14.1.2",
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"@types/node": "^25.0.10",
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"@types/proper-lockfile": "^4.1.4",
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"@types/ws": "^8.18.1",
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"@typescript/native-preview": "7.0.0-dev.20260211.1",
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"@vitest/coverage-v8": "^4.0.18",

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