creating-hooks

Creates lifecycle hooks: small scripts the host runs at session start, before or after a tool call, on prompt submit or at stop, to log, add context, warn or block deterministically. Covers GitHub Copilot hooks.json, Claude Code hooks in settings or a plugin, OpenAI Codex .codex/hooks.json, and this collection's per-host hook source. Use when a guardrail must hold regardless of what the model decides (block a dangerous command such as git push or rm -rf, check a file after every edit, inject context at start), when porting a hook between tools, or when a hook is slow, noisy or blocks the wrong things. For guidance the agent may weigh, use creating-instructions.