hook-development

Claude Code plugin hooks enable event-driven automation by configuring matchers and handlers for lifecycle events like PreToolUse, PostToolUse, and SessionStart to execute custom bash scripts or LLM reasoning automatically.

Prompt-based hooks leverage LLM reasoning for context-aware validation and decision-making, while deterministic command hooks execute bash scripts for precise, repeatable tasks without relying on AI inference.

You validate user inputs before tool execution by implementing a PreToolUse hook, which intercepts the event, processes the input data via environment variables, and determines whether the tool execution should proceed.

Claude Code hook development supports lifecycle management and debugging by providing structured configuration formats, environment variable handling, and performance considerations to trace and maintain event-driven workflows within plugins.

Security best practices for Claude Code hooks involve carefully managing environment variables, validating input/output data, and restricting bash script execution permissions to prevent unauthorized actions during event-driven automation.

Yes, you can use the SessionStart hook to automatically load project-specific configurations and initialize environment variables when a new Claude Code session begins, ensuring the context is correctly set up.