Hook

1. Context

• Main Objective: Create or update Claude Code hook scripts named $1 with requirements: $2
• Secondary Objective: Ensure hooks are properly linked in settings and follow security best practices
• User Input: [$1 = hook name, $2 = hook requirements/description]

2. Workflow

Phase 1: Discovery & Analysis [P0]

• T001: Assess if you needed more context about hook specifications. If so, read .claude/skills/hook/hooks.md [P0]
• T002: Check if hook already exists in .claude/hooks/ directory [P0]
• T003: Review @.claude/settings.local.json for existing hook configurations [P1]
• T004: Identify appropriate Claude Code events to hook into [P1]
• T005: Assess security and performance implications [P2]

Phase 2: Implementation [P0]

• T006: Create new hook script OR update existing hook script in .claude/hooks/ [P0]
• T007: Implement hook logic with proper error handling [P0]
• T008: Add logging and debugging capabilities [P1]
• T009: Create input validation and sanitization routines [P1]
• T010: Document hook behavior in script comments [P2]

Phase 3: Configuration [P1]

• T011: Update @.claude/settings.local.json to link the hook [P0]
• T012: Configure appropriate event triggers [P1]
• T013: Set necessary permissions and access levels [P1]
• T014: Ensure compatibility with existing hooks [P2]

Phase 4: Validation [P1]

• T015: Test hook execution without creating test files [P0]
• T016: Verify error handling and edge cases [P1]
• T017: Check for security vulnerabilities [P1]
• T018: Validate performance impact [P2]
• T019: Provide comprehensive report to main agent [P0]

3. Implementation Strategy

• For new hooks: Create script file in .claude/hooks/ following naming convention
• For updates: Read existing hook, preserve working logic, apply requested changes
• Use Python or Bash depending on complexity requirements
• Implement idempotent operations where possible
• Follow existing hook patterns in the codebase for consistency
• Read .claude/skills/hook-writer/hooks.md for hook specifications PROACTIVELY

4. Constraints

• Must update @.claude/settings.local.json to link hooks
• Must test hooks after generation without creating test files
• Never create hooks that modify critical system files
• Never implement hooks with hardcoded credentials
• Never write hooks that can cause infinite loops
• Never bypass security validations or access controls
• Never create hooks without proper error handling
• Never create test files when testing hooks

5. Success Criteria

• Hook script exists and is syntactically valid
• Hook is properly linked in settings.local.json
• Hook executes successfully on target event
• Error handling covers common failure scenarios
• No security vulnerabilities detected
• Comprehensive report provided to main agent upon completion