Geoffrey Huntley: Constrain Coding Agents to Use Diagnostic Libraries via Pre-commit Hooks

Geoffrey Huntley suggests that when coding agents do not use his diagnostic library, rather than updating AGENTS.md (which still suffers from bias and drift), it is better to write a pre-commit hook that checks git diffs for code bypassing the diagnostic module to directly call the observability module; if detected, the commit is rejected and a prompt is injected into the agent requiring it to use the diagnostic library. He claims this improved results from failure to a perfect score of ten. Simon Willison quoted this passage in his blog.