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Hook

Claude Code lifecycle interception. Hooks run before or after tool calls, prompts, or session events — useful for guardrails, logging, and policy.

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Overview

Hook is a lifecycle interception feature in Claude Code that executes custom scripts, HTTP endpoints, or prompts at specific trigger points. It sits in the AI-engineering stack as an automation layer, allowing developers to inject logic into the agentic loop, session management, or tool execution flow without modifying core code.

Use hooks to enforce guardrails, such as blocking destructive terminal commands, or to integrate custom logging and policy enforcement into your development environment. A common pitfall is over-complicating the matcher logic; keep your hooks performant and targeted because poorly written handlers can introduce latency into the agent's tool-call response time or cause unexpected session errors.

Overview based on established industry knowledge; specific figures are published only after source verification.

FAQ

Can hooks block tool calls?

Yes, by returning a permissionDecision of deny in a PreToolUse hook, you can stop specific tools from executing.

Where should I define project-specific hooks?

You should define them in the .claude/settings.json file within your project directory so they can be committed to your repository.

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