Hook Development

Event-driven hooks in Claude Code automate workflows by executing custom logic in response to specific events. You can create prompt-based or command-based hooks for deterministic and LLM-driven logic to validate tool use and manage context.

A PreToolUse hook enforces security policies by validating file write operations before execution. It implements security checks, validates inputs, and blocks dangerous commands to ensure sensitive operations are approved by the user.

Yes, Claude Code hooks support context management by loading project context, persisting environment variables, and managing session state when specific events occur, such as when a session starts.

Prompt-based hooks leverage LLM-driven logic for flexible automation, while command-based hooks execute deterministic scripts. Both hook types support event-driven task automation, policy enforcement, and external system integration within Claude Code.

Creating Claude Code plugin hooks requires scripting knowledge for command-based deterministic logic and prompt engineering for prompt-based LLM-driven hooks. The advanced hooks API supports complex event-driven automation for validating tool use and enforcing policies.

You can automatically run linters and formatters on code edits by creating event-driven hooks that trigger after a tool completes. These hooks execute custom automation scripts to validate tests and enforce policies during your workflow.