AI Coding Agent Hooks

A hook is a shell script your AI coding agent runs automatically at a defined event — before a tool call, after a file edit, before a shell command executes. Used well, hooks enforce the policy you can't rely on a prompt alone to guarantee: block a secret before it's committed, log every tool call for an audit trail, or require a second check before a production command runs. Every hook below is real, copy-paste code — not a concept.

100 hooks · Written for Claude Code's documented hook contract

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⏱️ Session Lifecycle & Continuity

6 hooks

What happened at session start, resume, fork, compaction, and end — the moments a transcript alone doesn't make easy to reconstruct.

Flag an Abnormal Session-End Reason

Logs session-end reason, and flags anything other than clean clear/resume/logout as worth a look.

SessionEnd · Claude Code

Record Post-Compaction Token Delta

Logs when a compaction completed and what triggered it, for a context-usage trend record.

PostCompact · Claude Code

Record Session Resume Cost Estimate

Logs the estimated cache-write cost and idle gap every time a session resumes.

SessionStart · Claude Code

Require a Clean Git Status Before Compaction

Blocks context compaction if the working tree has uncommitted changes.

PreCompact · Claude Code

Session-End Compliance Checklist Reminder

On explicit logout, checks for an open compliance TODO file and surfaces a reminder before the session closes.

SessionEnd · Claude Code

Warn and Log Session Fork Events

Flags whenever a session is forked, since a fork inherits the parent's full context and permission state.

SessionStart · Claude Code

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