Block Files That Skip Git Hooks
Blocks on an agent's file writes and at turn end.
Acts on
File write · Turn end
When
Before the file write · at turn end
Tested
28 of 28 pass
In a git repo
At commit
What it does
Friction, not a security boundary: flags lines added to hook launchers and scripts that switch git hooks off -- the hook-skip option on a git commit/push/merge/am/rebase/pull, core.hooksPath set by git config or GIT_CONFIG_*, the husky, lefthook and pre-commit off-switch variables, a pre-commit, lefthook or husky (v8 and older) uninstall -- in .husky/, .githooks/, lefthook, package.json, Makefile, justfile, .envrc, *.sh. Blocks. Misses: split lines, -n.
Chock adds friction. It is not a security boundary.
Its label on each agent
The catalog grades each policy on each agent. Pick an agent to build with this policy:
- Claude Code TestedBlocks Blocks on an agent's file writes and at turn endBuild →
- Cursor TestedBlocks Blocks on an agent's file writes and at turn endBuild →
- Codex TestedBlocks Blocks on an agent's file writes and at turn end. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run)Build →
- GitHub Copilot TestedBlocks Blocks at turn end only. It does not check a file write when it happens. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run)Build →
- Devin TestedBlocks Blocks at turn end only. It does not check a file write when it happens. If the hook errors, the action goes through (vendor docs only, not witnessed)Build →
- Grok Tested Not graded yet for GrokBuild →
- goose Tested Not graded yet for gooseBuild →
- Antigravity Tested Not graded yet for AntigravityBuild →
- OpenHands Untested Not graded yet for OpenHandsBuild →
- Kimi Code Untested Not graded yet for Kimi CodeBuild →
- Factory Droid Untested Not graded yet for Factory DroidBuild →
See it in action
Refused
A package.json prepare script points core.hooksPath at a directory of its own.
Allowed
A hook script reads core.hooksPath to report where the hooks live.
Both examples are this policy's own test cases.
What it misses
Split lines, -n.
Latest change
0.1.2 · · Title wording only (IR-F40): "Block Hook Bypass In Files" is now "Block Files That Skip Git Hooks". The id, guard and tests are unchanged.