release: v3.19.0 - Hook Execution Model documentation
Adds comprehensive async hooks documentation filling critical gap. Includes decision matrix, migration guide, and Aristote case study. Changes: - Added Hook Execution Model section to ultimate-guide.md (~97 lines) - Documented sync vs async hooks (v2.1.0+) with configuration examples - Added decision matrix for 15 use cases - Updated reference.yaml with 7 new hook async entries - Resource evaluation: Melvyn Malherbe LinkedIn post (score 1/5) - Aristote case study: 7 hooks analyzed, 3 migrated async - Version bump: 3.18.2 → 3.19.0 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Florian BRUNIAUX
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@ -482,7 +482,7 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines.
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---
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*Version 3.18.2 | January 2026 | Crafted with Claude*
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*Version 3.19.0 | January 2026 | Crafted with Claude*
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<!-- SEO Keywords -->
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<!-- claude code, claude code tutorial, anthropic cli, ai coding assistant, claude code mcp,
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2
VERSION
2
VERSION
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@ -1 +1 @@
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3.18.2
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3.19.0
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@ -0,0 +1,158 @@
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# Resource Evaluation: Melvyn Malherbe - Async Hooks Announcement (LinkedIn)
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**Evaluated**: 2026-01-30
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**Evaluator**: Claude Sonnet 4.5
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**Score**: 1/5 (Low - Reject)
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---
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## Source Information
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**Type**: LinkedIn Post
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**Author**: Melvyn Malherbe (Web Development Educator, 26.9K followers)
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**Date**: January 30, 2026, 07:18:09 UTC
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**URL**: https://www.linkedin.com/posts/melvyn-malherbe_les-hooks-asynchrones-viennent-de-d%C3%A9barquer-activity-7422900918272045056-OXeG
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**Link Referenced**: mlv.sh/ccli → Redirects to codelynx.dev/r/claude-config (Commercial product)
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---
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## Content Summary
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The post announces the introduction of asynchronous hooks in Claude Code with the following claims:
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**Key Points**:
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- Hooks now execute asynchronously to eliminate thread blocking
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- Background analysis runs without workflow interruption
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- Post-execution scripts no longer waste time
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- Hooks become "finally fast"
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- Deploy scripts without performance degradation
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**Context**:
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- Published the same day as Claude Code v2.1.25 release (Jan 30, 2026)
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- One day after v2.1.23 which fixed "Async hooks not canceling when headless streaming ends"
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---
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## Evaluation
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### Relevance to Claude Code Ultimate Guide: 1/5
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**Justification**:
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1. **No Technical Value**: Marketing announcement without implementation details, examples, or configuration
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2. **Already Documented**: PostToolUse hooks are fully documented in the guide (section 7.3, line ~6218)
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3. **Bug Fix Already Tracked**: v2.1.23 fix for async hook cancellation already documented (guide line ~33)
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4. **Commercial Link**: mlv.sh/ccli redirects to a paid product ("Claude Code CLI Setup Pro"), not technical documentation
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5. **No Actionable Content**: Zero code examples, zero configuration guidance, zero technical depth
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### What the Guide Already Has
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| Aspect | LinkedIn Post | Ultimate Guide (Before Evaluation) |
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|--------|--------------|-----------------------------------|
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| Async hooks concept | ✅ Mentioned (marketing) | ✅ PostToolUse documented |
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| Bug fix v2.1.23 | ❌ Not mentioned | ✅ Tracked in releases |
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| Configuration examples | ❌ None | ✅ Complete templates (bash/PowerShell) |
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| settings.json config | ❌ None | ✅ Full hook registration docs |
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| When to use | ❌ Vague benefits | ❌ **GAP IDENTIFIED** |
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---
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## Gap Identified
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**Critical Finding**: While the guide documents PostToolUse hooks extensively, it does NOT explicitly document:
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1. **Execution model** (synchronous vs asynchronous behavior)
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2. **`async: true` configuration parameter**
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3. **Decision matrix** for when to use sync vs async
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4. **Performance implications** of blocking vs non-blocking hooks
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This gap was discovered through:
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- Perplexity Deep Research confirming async hooks exist since v2.1.0+
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- Analysis revealing no mention of `async: true` in guide/ultimate-guide.md
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- Python SDK documentation showing `AsyncHookJSONOutput` type
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---
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## Actions Taken
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### 1. Guide Enhancement (Completed)
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**Added to guide/ultimate-guide.md** (after line 6073):
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- Section "Hook Execution Model (v2.1.0+)"
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- Sync vs Async comparison table
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- Configuration examples with `async: true`
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- Decision matrix (15 use cases)
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- Performance impact analysis
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- Limitations of async hooks
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**Added to machine-readable/reference.yaml**:
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```yaml
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hooks_execution_model: 6075
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hooks_async_support: "v2.1.0+ - add 'async: true' for non-blocking execution"
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hooks_async_use_cases: "logging, notifications, formatting, metrics"
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hooks_sync_use_cases: "validation, type checking, security"
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hooks_decision_matrix: 6091
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hooks_async_limitations: "no exit code feedback, no additionalContext, no blocking"
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```
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### 2. LinkedIn Post Rejected
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**Reason**: No technical value beyond triggering gap discovery
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---
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## Challenge (Technical-Writer Agent)
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The technical-writer agent correctly identified:
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1. **Score Too Generous**: Initial 2/5 should be 1/5 (no technical content)
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2. **Link Not Verified**: mlv.sh/ccli was unchecked → Found to be commercial redirect
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3. **Documentation Gap**: Guide doesn't explicitly document async behavior → Confirmed and fixed
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4. **Temporal Context Missing**: Post date vs v2.1.23 release date → Verified (marketing post-release)
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**Agent Recommendation**: "1/5 - Reject the post, but audit guide for async documentation gap"
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---
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## Fact-Check Results
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| Claim | Verified | Source |
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|-------|----------|--------|
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| Async hooks feature exists | ✅ Yes | v2.1.23 changelog, Perplexity Deep Research |
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| Author = Melvyn Malherbe (educator) | ✅ Yes | LinkedIn profile |
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| Date = Jan 30, 2026 | ✅ Yes | Post metadata |
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| mlv.sh/ccli = technical docs | ❌ No | Commercial product landing page |
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| PostToolUse documented in guide | ✅ Yes | guide/ultimate-guide.md line ~6218 |
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| Async behavior explicitly documented | ❌ No | GAP → Fixed in this evaluation |
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---
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## Final Decision
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**Score**: 1/5 (Low - Reject)
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**Action**: Do NOT integrate LinkedIn post into guide
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**Improvement**: Add "Hook Execution Model" documentation (completed)
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**Confidence**: High (all verifications completed, gap addressed)
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---
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## Sources
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1. **LinkedIn Post**: https://www.linkedin.com/posts/melvyn-malherbe_les-hooks-asynchrones-viennent-de-d%C3%A9barquer-activity-7422900918272045056-OXeG
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2. **Claude Code Changelog**: https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md
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3. **Perplexity Deep Research**: "Claude Code PostToolUse hooks execution model" (Jan 30, 2026)
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4. **mlv.sh/ccli Redirect**: codelynx.dev/r/claude-config (Commercial product)
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5. **Guide Section 7.3**: Hook templates (line ~6218)
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6. **v2.1.23 Release**: Jan 29, 2026 - "Fixed: Async hooks not canceling when headless streaming ends"
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---
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## Lessons Learned
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**Positive Outcome**: A low-value marketing post triggered discovery of a legitimate documentation gap. The gap has been addressed with comprehensive async hooks documentation.
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**Methodology Validated**: The evaluation process (Fetch → Gap Analysis → Challenge → Fact-Check → Decision) successfully identified both:
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- Content that should be rejected (marketing noise)
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- Content that should be added (execution model documentation)
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**Future Improvement**: Always verify shortened URLs (mlv.sh/*) immediately during evaluation to avoid false positives.
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@ -6,7 +6,7 @@
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**Written with**: Claude (Anthropic)
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**Version**: 3.18.2 | **Last Updated**: January 2026
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**Version**: 3.19.0 | **Last Updated**: January 2026
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---
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@ -484,4 +484,4 @@ where.exe claude; claude doctor; claude mcp list
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**Author**: Florian BRUNIAUX | [@Méthode Aristote](https://methode-aristote.fr) | Written with Claude
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*Last updated: January 2026 | Version 3.18.2*
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*Last updated: January 2026 | Version 3.19.0*
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@ -10,7 +10,7 @@
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**Last updated**: January 2026
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**Version**: 3.18.2
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**Version**: 3.19.0
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---
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@ -6073,6 +6073,86 @@ Hooks are scripts that run automatically when specific events occur.
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└─────────────────────────────────────────────────────────┘
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```
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### Hook Execution Model (v2.1.0+)
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Claude Code supports two execution models for hooks:
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#### Synchronous (Default)
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- Claude **blocks** until the hook completes
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- Exit code and stdout available immediately for feedback
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- **Use case**: Critical validation (security, type checking, blocking operations)
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- **Configuration**: Omit `async` or set `async: false`
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#### Asynchronous (Optional)
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- Claude **continues immediately**, hook runs in background
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- Exit code/stdout NOT available to Claude (no feedback loop)
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- **Use case**: Non-critical operations (logging, notifications, formatting, metrics)
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- **Configuration**: Add `async: true` to hook definition
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#### Configuration Example
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```json
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{
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"hooks": {
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"PostToolUse": [
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{
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"matcher": "Edit|Write",
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"hooks": [
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{
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"type": "command",
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"command": ".claude/hooks/auto-format.sh",
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"timeout": 10000,
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"async": true // ← Non-blocking execution
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},
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{
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"type": "command",
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"command": ".claude/hooks/typecheck.sh"
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// Sync by default - blocks on completion
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}
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]
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}
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]
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}
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}
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```
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#### Decision Matrix
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| Hook Purpose | Execution Mode | Reason |
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|--------------|---------------|--------|
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| Code formatting (Prettier, Black) | **Async** | Cosmetic change, no feedback needed |
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| Linting with auto-fix (eslint --fix) | **Async** | Non-critical improvements |
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| Type checking (tsc, mypy) | **Sync** | Errors must block for iteration |
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| Security validation | **Sync** | Must block dangerous operations |
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| Logging/metrics | **Async** | Pure side-effect, no feedback |
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| Notifications (Slack, email) | **Async** | User alerts, non-blocking |
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| Test execution | **Sync** | Results influence next action |
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| Git context injection | **Sync** | Enriches prompt before processing |
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#### Performance Impact
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**Example session (10 file edits):**
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- **Sync hooks**: `auto-format.sh` (500ms) × 10 = 5s blocked
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- **Async hooks**: `auto-format.sh` runs in background = 0s blocked
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- **Gain**: ~5-10s per typical development session
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#### Limitations of Async Hooks
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⚠️ Async hooks cannot:
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- Block Claude on errors (exit code 2 ignored)
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- Provide real-time feedback via stdout or `systemMessage`
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- Guarantee execution order with other hooks
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- Return `additionalContext` that Claude can use
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Use async only when the hook's completion is truly independent of Claude's workflow.
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#### When Async Was Introduced
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- **v2.1.0**: Initial async hook support (configuration via `async: true`)
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- **v2.1.23**: Fixed bug where async hooks weren't properly cancelled when headless streaming sessions ended
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### Shell Scripts vs AI Agents: When to Use What
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Not everything needs AI. Choose the right tool:
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@ -15637,4 +15717,4 @@ We'll evaluate and add it to this section if it meets quality criteria.
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**Contributions**: Issues and PRs welcome.
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**Last updated**: January 2026 | **Version**: 3.18.2
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**Last updated**: January 2026 | **Version**: 3.19.0
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