← Friday, October 16, 2026AgentsEssay

Pre-commit hooks can steer coding agents toward approved diagnostics

simonwillison.net Editor score 7/10

A pre-commit hook scans diffs for direct calls that bypass a diagnostics library, then blocks the commit and prompts the agent to use it. Enforcing conventions in tooling can be more reliable than maintaining instructions that drift.

What
- A pre-commit hook checks diffs for direct observability calls that bypass the diagnostics library.
How
- On a violation, it fails the commit and injects a prompt directing the coding agent to use that library.
Why it matters
- Repository checks can enforce conventions for agent-written code, reducing reliance on instructions that may drift.
changes checked failure + prompt uses agent git diff diagnosticslibrary pre-commit hook
A pre-commit check redirects agent changes to the approved diagnostics library. Sketched from the article's own text.

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