Summary
This is your reference for building executable hooks that tap into Claude Code's event system. It covers the four main events (session start, prompt submit, tool call, assistant response), shows you how to handle JSON input from stdin and use exit codes to block operations, and walks through the PRPM package structure if you want to publish. The format requirements are specific: you need shebangs, executable permissions, and proper quoting around variables. Most useful when you're actually writing a hook and need to remember whether blocking is exit 2 or when to use stderr vs stdout. The examples are practical, showing real validation and logging patterns in both bash and TypeScript.
Install to Claude Code
npx -y skills add agentworkforce/relay --skill creating-claude-hooks --agent claude-codeInstalls into .claude/skills of the current project.
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Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →An agent that runs the SEO playbooks that move rankings and ships PRs you control.
Get founding access →Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →
