Hooks are shell commands Claude Code runs at fixed points: before a tool call, after an edit, when a session stops.
Works in
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A hook that stops a runaway loop before it burns through your plan or your API bill.
The Reddit threads
Blocks the agent from reading .env files, keys and credentials unless you allow it.
The Reddit threads
Makes the agent list its assumptions and ask questions before its first edit on a vague task.
The Reddit threads
Most upvoted Reddit posts
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Hooks are shell commands that Claude Code runs automatically at set points in a session, such as before a tool call (PreToolUse), after one (PostToolUse), when you submit a prompt, or when Claude finishes (Stop). They live in settings.json and can block a tool call.
A skill is instructions Claude chooses to follow. A hook is code that always runs, whatever Claude decides. Use a hook for rules that must hold every time, like formatting, tests or blocking edits to certain files.
Token budget guard: A hook that stops a runaway loop before it burns through your plan or your API bill. It is sized at weekend, and the threads behind it have 1.3k upvotes.
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