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# src/hooks/ — 52 Lifecycle Hooks
# src/hooks/ — ~50 Lifecycle Hooks Across 57 Dirs
**Generated: ** 2026-04-1 8
**Generated: ** 2026-05-0 8
## OVERVIEW
52 hooks across dedicated modules and standalone files. Three-tier composition: Core(43) + Continuation(7) + Skill(2) . All hooks follow `createXXXHook(deps) → HookFunction` factory pattern.
50 hooks (7 of the 57 dirs are `zauc-mocks-*` test scaffolds + 1 `shared/` ). 5-tier composition wired in `src/plugin/hooks/` `createXXXHook(deps) → HookFunction` factory pattern.
## HOOK TIERS
## TIER COMPOSITION
| Tier | Composer | Count | When |
|------|----------|-------|------|
| **Session ** | `create-session-hooks.ts` | 24 | OpenCode session lifecycle (created/idle/error/status) + chat.params + chat.message |
| **Tool Guard ** | `create-tool-guard-hooks.ts` | 14 | Pre/post tool execution |
| **Transform ** | `create-transform-hooks.ts` | 5 | `experimental.chat.messages.transform` |
| **Continuation ** | `create-continuation-hooks.ts` | 7 | Boulder/atlas/compaction/notification |
| **Skill ** | `create-skill-hooks.ts` | 2 | Skill awareness (categorySkillReminder, autoSlashCommand) |
| **Team-mode ** | conditional in registries | 4 | When `team_mode.enabled` : team-mailbox-injector, team-mode-status-injector, team-session-events, team-tool-gating |
### Tier 1: Session Hooks (24)
| Hook | Event | Purpose |
|------|-------|---------|
| `contextWindowMonitor` | session.idle | Track context usage |
| `preemptiveCompaction` | session.idle | Trigger compaction before limit |
| `sessionRecovery` | session.error | Recover from structural errors (tool_result_missing, thinking_block_order) |
| `sessionNotification` | session.idle | OS notifications on completion |
| `thinkMode` | chat.params | Model variant switching for extended thinking |
| `anthropicContextWindowLimitRecovery` | session.error | Multi-strategy context recovery (truncation, compaction, dedup) |
| `autoUpdateChecker` | session.created | Check npm for plugin updates |
| `agentUsageReminder` | chat.message | Remind about available agents |
| `nonInteractiveEnv` | chat.message | Adjust behavior for `run` command |
| `interactiveBashSession` | tool.execute | Tmux session lifecycle for interactive_bash tool |
| `ralphLoop` | event | Self-referential dev loop (boulder continuation) |
| `editErrorRecovery` | tool.execute.after | Retry failed file edits |
| `delegateTaskRetry` | tool.execute.after | Retry failed task delegations |
| `startWork` | chat.message | `/start-work` command handler |
| `prometheusMdOnly` | tool.execute.before | Enforce .md-only writes for Prometheus |
| `sisyphusJuniorNotepad` | chat.message | Notepad injection for subagents |
| `questionLabelTruncator` | tool.execute.before | Truncate long Question tool labels |
| `taskResumeInfo` | chat.message | Inject task context on resume |
| `anthropicEffort` | chat.params | Adjust reasoning effort level |
| `modelFallback` | chat.params | Provider-level proactive model fallback |
| `noSisyphusGpt` | chat.message | Block Sisyphus from non-GPT providers (with warning toast) |
| `noHephaestusNonGpt` | chat.message | Block Hephaestus from non-GPT models |
| `runtimeFallback` | event | Reactive auto-switch on API provider errors |
| `legacyPluginToast` | chat.message | Show toast when legacy plugin name detected |
### Tier 2: Tool Guard Hooks (14)
| Hook | Event | Purpose |
|------|-------|---------|
| `commentChecker` | tool.execute.after | Block AI-slop comment patterns (binary: `@code-yeongyu/comment-checker` ) |
| `toolOutputTruncator` | tool.execute.after | Truncate oversized tool output |
| `directoryAgentsInjector` | tool.execute.before | Inject dir-local AGENTS.md into context |
| `directoryReadmeInjector` | tool.execute.before | Inject dir-local README.md into context |
| `emptyTaskResponseDetector` | tool.execute.after | Detect empty task results |
| `rulesInjector` | tool.execute.before | Conditional rules injection (AGENTS.md, .rules) |
| `tasksTodowriteDisabler` | tool.execute.before | Disable TodoWrite when Sisyphus task system active |
| `writeExistingFileGuard` | tool.execute.before | Require Read before Write/Edit on existing files |
| `bashFileReadGuard` | tool.execute.before | Guard bash commands that read files (cat/head/tail) |
| `readImageResizer` | tool.execute.after | Resize large images for context efficiency |
| `todoDescriptionOverride` | tool.execute.before | Override todo item descriptions |
| `webfetchRedirectGuard` | tool.execute.before | Guard webfetch redirect behavior |
| `hashlineReadEnhancer` | tool.execute.after | Tag every Read output with `LINE#ID` content hashes |
| `jsonErrorRecovery` | tool.execute.after | Detect JSON parse errors, inject correction reminder |
### Tier 3: Transform Hooks (5)
| Hook | Event | Purpose |
|------|-------|---------|
| `claudeCodeHooks` | messages.transform | Claude Code settings.json compatibility |
| `keywordDetector` | messages.transform | Detect ultrawork/search/analyze/team modes; inject mode-specific prompt |
| `contextInjectorMessagesTransform` | messages.transform | Inject AGENTS.md/README.md into context |
| `thinkingBlockValidator` | messages.transform | Validate thinking block structure |
| `toolPairValidator` | messages.transform | Validate tool call/result pairing |
### Tier 4: Continuation Hooks (7)
| Hook | Event | Purpose |
|------|-------|---------|
| `stopContinuationGuard` | chat.message | `/stop-continuation` command handler |
| `compactionContextInjector` | session.compacted | Re-inject context after compaction |
| `compactionTodoPreserver` | session.compacted | Preserve todos through compaction |
| `todoContinuationEnforcer` | session.idle | **Boulder ** — force continuation on incomplete todos |
| `unstableAgentBabysitter` | session.idle | Monitor unstable agent behavior |
| `backgroundNotificationHook` | event | Background task completion notifications |
| `atlasHook` | event | Master orchestrator for boulder/background sessions |
### Tier 5: Skill Hooks (2)
| Hook | Event | Purpose |
|------|-------|---------|
| `categorySkillReminder` | chat.message | Hint to load skills before invoking categories |
| `autoSlashCommand` | chat.message | Auto-execute matching `/command` from user message |
### Team-mode Hooks (4, conditional)
Activated only when `team_mode.enabled: true` :
| Hook | Tier | Purpose |
|------|------|---------|
| `team-mode-status-injector` | Transform | Inject `<team_mode_status>` block into messages |
| `team-mailbox-injector` | Transform | Pull pending team mailbox messages into agent context |
| `team-session-events` | Continuation | React to member session lifecycle (created/idle/deleted) |
| `team-tool-gating` | Tool Guard | Restrict `team_*` tools based on member role + permissions |
### Tier 1: Session Hooks (24) — `create-session-hooks.ts`
## STRUCTURE
```
hooks/
├── agent-usage-reminder/ # Reminds about available agents
├── atlas/ # Main orchestration (757 lines )
├── anthropic-context-window-limit-recovery/ # Auto-summarize
├ ── anthropic-effort/ # Reasoning effort level adjustment
├── auto-slash-command/ # Detects /command patterns
├── auto-update-checker/ # Plugin update check
├── background-notification/ # OS notification
├── category-skill-reminder/ # Reminds of category skills
├── claude-code-hooks/ # settings.json compat layer
├── comment-checker/ # Prevents AI slop
├── compaction-context-injector/ # Injects context on compaction
├── compaction-todo-preserver/ # Preserves todos through compaction
├── delegate-task-retry/ # Retries failed delegations
├── directory-agents-injector/ # Auto-injects AGENTS.md
├── directory-readme-injector/ # Auto-injects README.md
├── edit-error-recovery/ # Recovers from failures
├── hashline-edit-diff-enhancer/ # Enhanced diff output for hashline edits
├── hashline-read-enhancer/ # Adds LINE#ID hashes to Read output
├── interactive-bash-session/ # Tmux session management
├── json-error-recovery/ # JSON parse error correction
├── keyword-detector/ # ultrawork/search/analyze modes
├── legacy-plugin-toast/ # Legacy plugin name migration toast
├── model-fallback/ # Provider-level model fallback
├── no-hephaestus-non-gpt/ # Block Hephaestus from non-GPT
├── no-sisyphus-gpt/ # Block Sisyphus from GPT
├── non-interactive-env/ # Non-TTY environment handling
├── prometheus-md-only/ # Planner read-only mode
├── question-label-truncator/ # Auto-truncates question labels
├── ralph-loop/ # Self-referential dev loop
├── read-image-resizer/ # Resize images for context efficiency
├── rules-injector/ # Conditional rules
├── runtime-fallback/ # Auto-switch models on API errors
├── session-recovery/ # Auto-recovers from crashes
├── sisyphus-junior-notepad/ # Sisyphus Junior notepad
├── start-work/ # Sisyphus work session starter
├── stop-continuation-guard/ # Guards stop continuation
├── task-reminder/ # Task system usage reminders
├── task-resume-info/ # Resume info for cancelled tasks
├── tasks-todowrite-disabler/ # Disable TodoWrite when task system active
├── think-mode/ # Dynamic thinking budget
├── thinking-block-validator/ # Ensures valid <thinking>
├── todo-continuation-enforcer/ # Force TODO completion
├── todo-description-override/ # Override todo descriptions
├── tool-pair-validator/ # Validate tool pair usage
├── unstable-agent-babysitter/ # Monitor unstable agent behavior
├── webfetch-redirect-guard/ # Guard webfetch redirect behavior
├── write-existing-file-guard/ # Require Read before Write
└── index.ts # Hook aggregation + registration
├── shared/ # Cross-hook helpers (timing, prompt builders, etc.)
├── (50 hook directories — see tier tables above )
├── zauc-mocks-bg, zauc-mocks-cache, … # Test mocks (NOT hooks; named for sort-order isolation)
└ ── (each hook dir)/
├── index.ts # createXXXHook factory + barrel
├── *.ts # implementation
└── *.test.ts # bun:test
```
| Hook | Event | Purpose |
|------|-------|---------|
| contextWindowMonitor | session.idle | Track context window usage |
| preemptiveCompaction | session.idle | Trigger compaction before limit |
| sessionRecovery | session.error | Auto-retry on recoverable errors |
| sessionNotification | session.idle | OS notifications on completion |
| thinkMode | chat.params | Model variant switching (extended thinking) |
| anthropicContextWindowLimitRecovery | session.error | Multi-strategy context recovery (truncation, compaction) |
| autoUpdateChecker | session.created | Check npm for plugin updates |
| agentUsageReminder | chat.message | Remind about available agents |
| nonInteractiveEnv | chat.message | Adjust behavior for `run` command |
| interactiveBashSession | tool.execute | Tmux session for interactive tools |
| ralphLoop | event | Self-referential dev loop (boulder continuation) |
| editErrorRecovery | tool.execute.after | Retry failed file edits |
| delegateTaskRetry | tool.execute.after | Retry failed task delegations |
| startWork | chat.message | `/start-work` command handler |
| prometheusMdOnly | tool.execute.before | Enforce .md-only writes for Prometheus |
| sisyphusJuniorNotepad | chat.message | Notepad injection for subagents |
| questionLabelTruncator | tool.execute.before | Truncate long question labels |
| taskResumeInfo | chat.message | Inject task context on resume |
| anthropicEffort | chat.params | Adjust reasoning effort level |
| modelFallback | chat.params | Provider-level model fallback on errors |
| noSisyphusGpt | chat.message | Block Sisyphus from using GPT models (toast warning) |
| noHephaestusNonGpt | chat.message | Block Hephaestus from using non-GPT models |
| runtimeFallback | event | Auto-switch models on API provider errors |
| legacyPluginToast | chat.message | Show toast when legacy plugin name detected |
## ADDING A NEW HOOK
### Tier 2: Tool Guard Hooks (14) — `create-tool-guard-hooks.ts`
1. `mkdir src/hooks/{name}` + `index.ts` exporting `createXXXHook(deps)`
2. Pick the right tier:
- Session lifecycle? → `create-session-hooks.ts`
- Pre/post tool? → `create-tool-guard-hooks.ts`
- Message transform? → `create-transform-hooks.ts`
- Continuation/idle? → `create-continuation-hooks.ts`
- Skill awareness? → `create-skill-hooks.ts`
- Team-mode-only? → register inside the team-mode conditional block
3. Add hook name to [`config/schema/hooks.ts` ](file:///Users/yeongyu/local-workspaces/omo/src/config/schema/hooks.ts ) `HookNameSchema`
4. Cover with co-located `*.test.ts` (given/when/then style)
| Hook | Event | Purpose |
|------|-------|---------|
| commentChecker | tool.execute.after | Block AI-generated comment patterns |
| toolOutputTruncator | tool.execute.after | Truncate oversized tool output |
| directoryAgentsInjector | tool.execute.before | Inject dir AGENTS.md into context |
| directoryReadmeInjector | tool.execute.before | Inject dir README.md into context |
| emptyTaskResponseDetector | tool.execute.after | Detect empty task responses |
| rulesInjector | tool.execute.before | Conditional rules injection (AGENTS.md, config) |
| tasksTodowriteDisabler | tool.execute.before | Disable TodoWrite when task system active |
| writeExistingFileGuard | tool.execute.before | Require Read before Write on existing files |
| bashFileReadGuard | tool.execute.before | Guard bash commands that read files |
| readImageResizer | tool.execute.after | Resize large images for context efficiency |
| todoDescriptionOverride | tool.execute.before | Override todo item descriptions |
| webfetchRedirectGuard | tool.execute.before | Guard webfetch redirect behavior |
| hashlineReadEnhancer | tool.execute.after | Enhance Read output with line hashes |
| jsonErrorRecovery | tool.execute.after | Detect JSON parse errors, inject correction reminder |
## NOTES
### Tier 3: Transform Hooks (5) — `create-transform-hooks.ts`
| Hook | Event | Purpose |
|------|-------|---------|
| claudeCodeHooks | messages.transform | Claude Code settings.json compatibility |
| keywordDetector | messages.transform | Detect ultrawork/search/analyze modes |
| contextInjectorMessagesTransform | messages.transform | Inject AGENTS.md/README.md into context |
| thinkingBlockValidator | messages.transform | Validate thinking block structure |
| toolPairValidator | messages.transform | Validate tool call/result pairs |
### Tier 4: Continuation Hooks (7) — `create-continuation-hooks.ts`
| Hook | Event | Purpose |
|------|-------|---------|
| stopContinuationGuard | chat.message | `/stop-continuation` command handler |
| compactionContextInjector | session.compacted | Re-inject context after compaction |
| compactionTodoPreserver | session.compacted | Preserve todos through compaction |
| todoContinuationEnforcer | session.idle | **Boulder ** : force continuation on incomplete todos |
| unstableAgentBabysitter | session.idle | Monitor unstable agent behavior |
| backgroundNotificationHook | event | Background task completion notifications |
| atlasHook | event | Master orchestrator for boulder/background sessions |
### Tier 5: Skill Hooks (2) — `create-skill-hooks.ts`
| Hook | Event | Purpose |
|------|-------|---------|
| categorySkillReminder | chat.message | Remind about category+skill delegation |
| autoSlashCommand | chat.message | Auto-detect `/command` in user input |
## KEY HOOKS (COMPLEX)
### anthropic-context-window-limit-recovery (31 files, ~2232 LOC)
Multi-strategy recovery when hitting context limits. Strategies: truncation, compaction, summarization.
### atlas (17 files, ~1976 LOC)
Master orchestrator for boulder sessions. Decision gates: session type → abort check → failure count → background tasks → agent match → plan completeness → cooldown (5s). Injects continuation prompts on session.idle.
### ralph-loop (14 files, ~1687 LOC)
Self-referential dev loop via `/ralph-loop` command. State persisted in `.sisyphus/ralph-loop.local.md` . Detects `<promise>DONE</promise>` in AI output. Max 100 iterations default.
### todo-continuation-enforcer (13 files, ~2061 LOC)
"Boulder" mechanism. Forces agent to continue when todos remain incomplete. 2s countdown toast → continuation injection. Exponential backoff: 30s base, ×
### keyword-detector (~1665 LOC)
Detects modes from user input: ultrawork, search, analyze, prove-yourself. Injects mode-specific system prompts.
### rules-injector (19 files, ~1604 LOC)
Conditional rules injection from AGENTS.md, config, skill rules. Evaluates conditions to determine which rules apply.
## STANDALONE HOOKS (in src/hooks/ root)
| File | Purpose |
|------|---------|
| context-window-monitor.ts | Track context window percentage |
| preemptive-compaction.ts | Trigger compaction before hard limit |
| tool-output-truncator.ts | Truncate tool output by token count |
| session-notification.ts + 4 helpers | OS notification on session completion |
| empty-task-response-detector.ts | Detect empty/failed task responses |
| session-todo-status.ts | Todo completion status tracking |
## HOW TO ADD A HOOK
1. Create `src/hooks/{name}/index.ts` with `createXXXHook(deps)` factory
2. Register in appropriate tier file (`src/plugin/hooks/create-{tier}-hooks.ts` )
3. Add hook name to `src/config/schema/hooks.ts` HookNameSchema
4. Hook receives `(event, ctx)` — return value depends on event type
- **Tier order matters within a phase:** within Session tier the registration order in `create-session-hooks.ts` determines invocation order — earlier hooks see un-mutated input, later hooks see accumulated output.
- **Mock files** (`zauc-mocks-*` , `zauc-sync-mocks` ) are NOT hooks. They are placed inside `src/hooks/` purely so `bun:test` discovers them in the right order — auto-isolated by `script/run-ci-tests.ts` because they use `mock.module()` .
- **`atlasHook` vs `todoContinuationEnforcer` :** atlas handles boulder/ralph/subagent sessions, todoContinuationEnforcer handles the main Sisyphus session. Both fire on `session.idle` but check session type first.
- **`runtime-fallback` vs `model-fallback` :** runtime-fallback is reactive (after error); model-fallback is proactive (chat.params). They operate independently.
YeonGyu-Kim