Claude Code Hooks Provide Deterministic Control Over AI Development Sessions

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Claude Code hooks are automated commands that execute at specific points during AI coding sessions, such as before tool use or after file edits. Unlike advisory CLAUDE.md instructions, hooks run deterministically and can block actions entirely by exiting with code 2. The system includes 33 event types, with key hooks controlling tool usage, prompt processing, session management, and testing workflows. Hooks are configured in JSON settings files at project, user, or organizational levels, receiving tool call data via stdin. Anthropic recommends hooks when consistent enforcement is required, as they eliminate the variability of AI ignoring advisory rules.

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