> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase09-session03-codex-hook-map-and-codex-specific-handlers/implementation-notes.md). # Implementation Notes **Session ID**: `phase09-session03-codex-hook-map-and-codex-specific-handlers` **Package**: apps/hooks **Started**: 2026-05-31 07:00 **Last Updated**: 2026-05-31 08:32 *** ## Session Progress | Metric | Value | | ------------------- | ------- | | Tasks Completed | 22 / 22 | | Estimated Remaining | 0 hours | | Blockers | 0 | *** ### Task T022 - Validate ASCII/LF hygiene and session handoff notes **Started**: 2026-05-31 08:31 **Completed**: 2026-05-31 08:32 **Duration**: 1 minute **Notes**: * Verified touched hook files, tests, README, task checklist, and implementation notes contain ASCII-only content. * Verified touched files do not contain CRLF line endings. * Updated task checklist completion state and this implementation handoff log. **Files Changed**: * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked final task and completion checklist complete. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/implementation-notes.md` - updated final progress and handoff notes. **BQC Fixes**: * N/A - hygiene verification task. *** ## Session Summary **Tasks Completed**: 22 / 22 **BQC**: 8 fixes or verifications applied across 12 implementation/testing tasks. **Blockers**: 0 **Implemented**: * Added provider-specific hook maps: `hooks.claude.json` and `hooks.codex.json`. * Added Codex `SubagentStart` and compact `PostToolUse` handlers. * Extended file-access, permission, and subagent completion handlers for Codex `apply_patch`, MCP, permission descriptions, and agent stop fields. * Documented Codex hook trust, matcher, install-gap, and privacy boundaries from official OpenAI docs. * Added static, runtime, diagnostics, and map tests for Codex wiring, privacy redaction, and Claude no-regression behavior. **Verification Completed**: * Focused hooks tests passed. * Full `apps/hooks/tests` pass succeeded: 7 files, 51 tests. * Focused Biome check passed after formatting. * `git diff --check` passed. * ASCII and LF hygiene checks passed. **Ready For**: `validate` *** ### Task T021 - Run focused Biome and diff hygiene checks **Started**: 2026-05-31 08:30 **Completed**: 2026-05-31 08:31 **Duration**: 1 minute **Notes**: * Initial Biome check found formatting-only diffs in three test files. * Applied `npx biome format --write` to the touched hook files. * Re-ran focused `npx biome check ...` successfully. * Ran `git diff --check` successfully. **Files Changed**: * `apps/hooks/tests/codexHookMap.test.js` - Biome formatting. * `apps/hooks/tests/hookPayloads.test.js` - Biome formatting. * `apps/hooks/tests/orchestrationDiagnostics.test.js` - Biome formatting. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * N/A - formatting and whitespace verification task. *** ### Task T020 - Run focused hooks tests **Started**: 2026-05-31 08:29 **Completed**: 2026-05-31 08:30 **Duration**: 1 minute **Notes**: * Ran the focused hooks test set from the session spec. * Result: 5 files passed, 35 tests passed. * Also ran the full `apps/hooks/tests` directory after final hygiene checks: 7 files passed, 51 tests passed. **Files Changed**: * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * N/A - verification task. *** ### Task T019 - Add Codex diagnostics leak tests **Started**: 2026-05-31 07:39 **Completed**: 2026-05-31 08:29 **Duration**: 50 minutes **Notes**: * Added diagnostics coverage across real Codex patch, Bash result, MCP result, transcript, token, and agent-result inputs. * The first run exposed that sanitized `last_assistant_message` still preserved agent message text. Fixed subagent completion to store only an agent-message presence/length summary unless an explicit `summary` field is provided. * Ran `npx vitest run apps/hooks/tests/orchestrationDiagnostics.test.js` successfully after the fix. **Files Changed**: * `apps/hooks/src/factionos-subagent-complete.js` - tightened Codex agent-message summarization. * `apps/hooks/tests/orchestrationDiagnostics.test.js` - added Codex privacy diagnostics tests. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Error information boundaries: removed raw Codex `last_assistant_message` forwarding and replaced it with a bounded presence/length summary. * Failure path completeness: verified sanitized spool and log fallback when the server is unavailable. *** ### Task T018 - Document Codex map readiness and boundaries **Started**: 2026-05-31 07:36 **Completed**: 2026-05-31 07:39 **Duration**: 3 minutes **Notes**: * Updated README package framing to include provider maps and Codex source-template readiness. * Added new handler/map entries for `hooks.claude.json`, `hooks.codex.json`, `factionos-subagent-start.js`, and `factionos-tool-result.js`. * Replaced the older "does not yet ship hooks.codex.json" wording with narrower remaining gaps: no `~/.codex` writes, trust state, custom slash commands, server/web expansion, trust bypass, or live Codex validation. **Files Changed**: * `apps/hooks/README_hooks.md` - documented Codex map readiness, trust review, install gap, and privacy boundaries. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: documentation now matches shipped source files without overclaiming installed Codex support. *** ### Task T017 - Update static payload tests **Started**: 2026-05-31 07:33 **Completed**: 2026-05-31 07:36 **Duration**: 3 minutes **Notes**: * Added static assertions for provider-specific maps, new Codex handlers, patch metadata handling, description sanitization, result summaries, and transcript-path non-promotion. * Updated subagent completion assertions for Codex `last_assistant_message` and redacted transcript status. * Ran `npx vitest run apps/hooks/tests/hookPayloads.test.js` successfully. **Files Changed**: * `apps/hooks/tests/hookPayloads.test.js` - added Codex provider and payload privacy assertions. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: static tests pin new handler payload fields to declared contracts. * Error information boundaries: tests assert no raw patch, result, or transcript path field promotion. *** ### Task T016 - Wire Codex subagent groups and document gaps **Started**: 2026-05-31 07:32 **Completed**: 2026-05-31 07:33 **Duration**: 1 minute **Notes**: * Verified `SubagentStart` routes to the new Codex start handler and `SubagentStop` routes to the bounded completion handler. * Documented in the map comment that this source map is not an `AskUserQuestion` bridge or compact lifecycle hook map. **Files Changed**: * `apps/hooks/hooks.codex.json` - subagent groups wired and gap comment updated. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: only events implemented in this session are claimed by the Codex source map. *** ### Task T015 - Wire Codex PostToolUse and PermissionRequest groups **Started**: 2026-05-31 07:31 **Completed**: 2026-05-31 07:32 **Duration**: 1 minute **Notes**: * Verified `PostToolUse` groups route Bash, `apply_patch|Edit|Write`, and MCP results to `factionos-tool-result.js`. * Verified `PermissionRequest` groups route Bash, `apply_patch|Edit|Write`, and MCP requests to the decision-free permission handler. * Failure paths use the existing handler pattern: timeout-bounded POST, sanitized spool fallback, silent normal exit. **Files Changed**: * `apps/hooks/hooks.codex.json` - PostToolUse and PermissionRequest groups are wired with provider env, timeouts, and status messages. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Failure path completeness: map entries point at handlers that use bounded local POST and sanitized spool fallback. * Contract alignment: `PermissionRequest` remains decision-free in FactionOS despite Codex supporting decisions. *** ### Task T014 - Wire Codex PreToolUse groups **Started**: 2026-05-31 07:30 **Completed**: 2026-05-31 07:31 **Duration**: 1 minute **Notes**: * Verified `PreToolUse` groups for Bash, `apply_patch|Edit|Write`, and selected MCP file-like tool patterns. * Bash routing treats git guard and command observation as independent concurrent hooks and does not rely on one preventing the other from starting. **Files Changed**: * `apps/hooks/hooks.codex.json` - PreToolUse groups are wired with provider env, timeouts, and status messages. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Duplicate action prevention: map wiring does not rely on hook ordering or single-hook enforcement under Codex concurrent matching behavior. *** ### Task T013 - Wire Codex lifecycle map entries **Started**: 2026-05-31 07:29 **Completed**: 2026-05-31 07:30 **Duration**: 1 minute **Notes**: * Verified `SessionStart`, `UserPromptSubmit`, and `Stop` Codex map entries route to the existing lifecycle handlers. * `SessionStart` uses the documented `startup|resume|clear|compact` matcher and every lifecycle command sets `FACTIONOS_CLI=codex-cli`. **Files Changed**: * `apps/hooks/hooks.codex.json` - lifecycle groups are wired with provider env, timeouts, and status messages. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: lifecycle matcher behavior follows Codex event semantics. *** ### Task T012 - Update Codex permission request handling **Started**: 2026-05-31 07:26 **Completed**: 2026-05-31 07:29 **Duration**: 3 minutes **Notes**: * Added bounded handling for Codex `tool_input.description`. * Sanitized token-like values and broad local paths before including descriptions in local observability payloads. * Preserved decision-free behavior; the handler still emits no allow or deny response to Codex. **Files Changed**: * `apps/hooks/src/factionos-permission-request.js` - added Codex description handling and sanitization. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Trust boundary enforcement: provider-owned descriptions are sanitized before payload emission. * Error information boundaries: approval descriptions do not expose token-like values or broad local paths. *** ### Task T011 - Create compact PostToolUse result handler **Started**: 2026-05-31 07:22 **Completed**: 2026-05-31 07:26 **Duration**: 4 minutes **Notes**: * Added `factionos-tool-result.js` for Codex `PostToolUse` result summaries. * Summarizes Bash, `apply_patch`, and MCP results with status, success, exit code, response type, field counts, and compact labels only. * Kept the handler explicitly observability-only with no rollback or enforcement claim. **Files Changed**: * `apps/hooks/src/factionos-tool-result.js` - created compact result handler. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Error information boundaries: terminal output, patch body, and MCP result bodies are replaced with counts and stable status labels. * Contract alignment: handler models `PostToolUse` as after-the-fact observation, not side-effect rollback. *** ### Task T010 - Update Codex subagent completion handling **Started**: 2026-05-31 07:20 **Completed**: 2026-05-31 07:22 **Duration**: 2 minutes **Notes**: * Extended subagent completion to summarize Codex `last_assistant_message` when no explicit summary exists. * Added transcript presence status as `present_redacted` or `missing` without storing `agent_transcript_path`. * Logged only boolean transcript presence and normalized identifiers. **Files Changed**: * `apps/hooks/src/factionos-subagent-complete.js` - added Codex stop field handling and transcript redaction status. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Error information boundaries: transcript paths are converted to status labels only. * Contract alignment: Codex `SubagentStop` fields map into the existing bounded `subagent_complete` payload family. *** ### Task T009 - Create Codex SubagentStart handler **Started**: 2026-05-31 07:18 **Completed**: 2026-05-31 07:20 **Duration**: 2 minutes **Notes**: * Added a dedicated `SubagentStart` adapter that emits the existing bounded `subagent_spawn` payload family. * Reused shared normalized subagent metadata for `agent_id` and `agent_type`, including degraded-state fallback for missing or malformed IDs. * Kept handler output silent and avoided prompt or transcript fields. **Files Changed**: * `apps/hooks/src/factionos-subagent-start.js` - created Codex subagent start handler. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Trust boundary enforcement: normalizes provider-owned agent fields before emitting local observability payloads. * Error information boundaries: excludes transcript and raw agent context from payloads and diagnostics. *** ### Task T008 - Add Codex apply\_patch and MCP runtime coverage **Started**: 2026-05-31 07:15 **Completed**: 2026-05-31 07:18 **Duration**: 3 minutes **Notes**: * Added process tests for Codex `apply_patch` file-access payloads with path/count summaries only. * Added process tests for MCP file-like tool input with redacted path and no nested argument body storage. * Ran `npx vitest run apps/hooks/tests/hookRuntime.test.js` successfully. **Files Changed**: * `apps/hooks/src/factionos-file-access.js` - refined MCP path redaction for file-like Codex tools. * `apps/hooks/tests/hookRuntime.test.js` - added Codex `apply_patch` and MCP runtime fixtures. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Trust boundary enforcement: runtime fixtures exercise malformed-sensitive external provider shapes through the actual handler process. * Failure path completeness: tests keep server-unavailable spool behavior covered for new Codex file metadata paths. *** ### Task T007 - Extend Codex apply\_patch file-access handling **Started**: 2026-05-31 07:10 **Completed**: 2026-05-31 07:15 **Duration**: 5 minutes **Notes**: * Added `apply_patch` command-header summarization for touched paths, bounded line counts, primary path, and compact previews. * Added safe path handling for absolute or parent-traversal patch paths. * Added MCP file-like input path handling without forwarding nested argument bodies. **Files Changed**: * `apps/hooks/src/factionos-file-access.js` - added Codex patch and MCP-safe file metadata extraction. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Trust boundary enforcement: treats Codex `tool_input.command` and MCP arguments as external input and extracts only bounded metadata. * Error information boundaries: patch bodies and broad absolute paths are not placed in payload previews, logs, or spool summaries. *** ### Task T006 - Add Codex and Claude static map tests **Started**: 2026-05-31 07:08 **Completed**: 2026-05-31 07:10 **Duration**: 2 minutes **Notes**: * Expanded `codexHookMap.test.js` to verify Codex events, matchers, provider env, timeouts, status messages, and handler routing. * Added byte-identical Claude provider map and stable Claude command string assertions. * Ran focused static map tests successfully. **Files Changed**: * `apps/hooks/tests/codexHookMap.test.js` - added static map assertions. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: tests pin Codex matcher semantics and Claude compatibility before handler changes. *** ### Task T005 - Create Codex hook map template **Started**: 2026-05-31 07:05 **Completed**: 2026-05-31 07:08 **Duration**: 3 minutes **Notes**: * Added `hooks.codex.json` with Codex lifecycle, Bash, `apply_patch`, permission, result, MCP, and subagent matcher groups. * Commands set `FACTIONOS_CLI=codex-cli`, use `${PLUGIN_ROOT}` template paths, include Windows command overrides, explicit 5 second timeouts, and status messages. * Kept the file explicitly documented as a source template, not an installer or trust-state writer. **Files Changed**: * `apps/hooks/hooks.codex.json` - created initial Codex hook map template. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: map events and matcher use follow the current Codex hooks docs. * External dependency resilience: every Codex command hook has an explicit timeout. *** ### Task T004 - Create provider-specific Claude hook map **Started**: 2026-05-31 07:04 **Completed**: 2026-05-31 07:05 **Duration**: 1 minute **Notes**: * Added `hooks.claude.json` as a provider-specific Claude map source. * Verified `hooks.claude.json` is byte-for-byte identical to the existing `hooks.json` compatibility alias. **Files Changed**: * `apps/hooks/hooks.claude.json` - copied current Claude compatibility hook map. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * Contract alignment: verified the new Claude provider map is identical to the current installer-facing compatibility map. *** ### Task T003 - Create Codex hook map test scaffold **Started**: 2026-05-31 07:03 **Completed**: 2026-05-31 07:04 **Duration**: 1 minute **Notes**: * Added the new static map test file with repo-root JSON loading, matcher group lookup, and command extraction helpers. * Seeded the scaffold with a passing Claude compatibility assertion so the new file is active before Codex map assertions are added. **Files Changed**: * `apps/hooks/tests/codexHookMap.test.js` - created static hook-map test scaffold. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * N/A - test scaffold only. *** ### Task T002 - Record Codex hook, matcher, and trust constraints **Started**: 2026-05-31 07:01 **Completed**: 2026-05-31 07:03 **Duration**: 2 minutes **Notes**: * Reviewed official OpenAI Codex hooks, config reference, and slash-command docs through the OpenAI developer docs MCP. * Documented hook discovery, trust review, matcher semantics, concurrent hook behavior, `PermissionRequest`, `PostToolUse`, `apply_patch`, and slash-command boundaries. * Kept wording limited to source-map and handler readiness with explicit non-claims for install, trust bypass, custom slash commands, and production validation. **Files Changed**: * `apps/hooks/README_hooks.md` - added source-backed Codex hook map readiness section. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * N/A - documentation boundary clarification only. *** ### Task T001 - Verify Phase 09 prerequisites and hooks package touch set **Started**: 2026-05-31 07:00 **Completed**: 2026-05-31 07:01 **Duration**: 1 minute **Notes**: * Confirmed prior Phase 09 sessions are complete from spec-system state. * Verified environment and `apps/hooks` package prerequisites with local spec scripts. * Reviewed existing hook maps, handler scripts, tests, package manifests, README, and relevant docs/API contract before editing provider maps. **Files Changed**: * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/implementation-notes.md` - initialized session log. * `.spec_system/specs/phase09-session03-codex-hook-map-and-codex-specific-handlers/tasks.md` - marked task complete. **BQC Fixes**: * N/A - setup verification only. *** ## Task Log ### 2026-05-31 - Session Start **Environment verified**: * [x] Prerequisites confirmed * [x] Tools available * [x] Directory structure ready * [x] Package context resolved: `apps/hooks` * [x] No database prerequisites for this session *** --- # Agent Instructions This documentation is published with GitBook. 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