Hook Development

Event-driven automation with Claude Code hooks is built by creating custom logic that triggers on specific events like tool use or session start. Developers configure hook types and event handlers to execute validation and context management automatically.

A prompt-based hook in Claude Code plugin development is an advanced API mechanism that intercepts workflow events to run custom validation. It enables developers to implement sophisticated checks for tool calls, user inputs, and completion criteria without external scripts.

Automatic validation before Claude Code stops is configured using PreToolUse or completion event hooks. Developers define validation rules that check for criteria like unit test coverage, blocking the agent from stopping until all conditions pass.

Claude Code hook development supports blocking sensitive file writes by default through custom PreToolUse hooks. Developers configure security-focused validation logic that intercepts file write operations and prevents unauthorized access during event processing.

Command-based hooks for workflow automation face limitations in complex context management compared to prompt-based hooks. Developers must rely on external scripts for logic execution, requiring careful handling of performance considerations and debugging techniques.

Session state and environment variables in Claude Code are managed through custom hooks that load project context during session start events. Developers configure environment variables and orchestrate workflow state within the event-driven automation framework.