Hooks

Scripts the harness runs automatically at fixed points, such as before a tool call or after an edit.

A hook can format a file after every edit, block a dangerous command, or run tests before the agent stops. Unlike instructions in a prompt, a hook always runs, so it turns a preference into a guarantee.

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Related terms

AGENTS.md and CLAUDE.md: Files in a repository with the rules a coding agent reads at the start of every session.
Guardrails: Checks around a model that block, fix or flag inputs and outputs that break the rules.
Coding agent: An agent that reads a repository, edits files, runs commands and tests, and opens pull requests.

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