hooks-development
Hooks Development
Guide for developing Claude Code hooks with proper output visibility patterns.
Self-Evolving Skill: This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues.
When to Use This Skill
- Creating a new PostToolUse or PreToolUse hook
- Hook output is not visible to Claude (most common issue)
- User asks about
decision: blockpattern - Debugging why hook messages don't appear
- User mentions "Claude Code hooks" or "hook visibility"
Quick Reference: Visibility Patterns
Critical insight: PostToolUse hook stdout is only visible to Claude when JSON contains "decision": "block".
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