Geoffrey Huntley uses a pre-commit hook to constrain AI agents
What happened
On 13 October 2026, Simon Willison reported on an approach proposed by Geoffrey Huntley: use a pre-commit hook to inspect the git diff, and reject the commit as soon as code bypasses the diagnostics module and calls the observability module directly, while injecting a prompt into the AI agent requiring it to use the diagnostics library instead. Huntley argues that updating AGENTS.md alone still leaves deviations and gradual drift; after adopting this hook-plus-prompt approach, the agent's performance immediately reached a full ten out of ten. The report does not mention earlier related developments or any contradicting claims.
Written by AI from the reports · updated 3 d ago
Timeline
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- Simon WillisonQuoting Geoffrey Huntley
Geoffrey Huntley proposes using a pre-commit hook to inspect the git diff, reject commits that call observability modules directly and bypass the diagnostics module, and inject a prompt telling the AI agent to use the diagnostics library instead. He argues that updating AGENTS.md alone still leaves a delta and will drift, whereas this approach made the agent's performance instantly ten out of ten.
Heat of this event
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