Hook Development

Event-driven automation hooks in Claude Code are created by configuring custom logic for events like PreToolUse, PostToolUse, Stop, and SessionStart using prompt-based or command hooks to execute advanced validation and policy enforcement.

Prompt-based hooks use contextual text inputs for validation, while command hooks execute scripts to enforce policies. Both respond to Claude Code events like SessionStart and Stop, facilitating different levels of automated checks and context loading.

Yes, you can block file write operations by intercepting Write tool calls with PreToolUse hooks, and ensure all unit tests pass before the agent stops by implementing validation logic on the Stop event to enforce compliance.

You can validate file paths and prevent sensitive file modifications by implementing a PreToolUse hook that intercepts Write tool calls, checking for path traversal attempts and blocking modifications to restricted files.

No, setting up Claude Code hooks requires no external dependencies. The implementation relies entirely on internal scripts, references, and assets to configure event-driven automation and advanced checks within your workflow.

SessionStart hooks should be used when you need to automatically load specific context or enforce initial policies at the beginning of a Claude Code session, ensuring the environment meets required conditions before execution begins.