I find that if I leave an instruction in AGENTS.md to "do not do X", there's a good chance the agent will forget it.

But if I add a separate post-implementation pass to "find and fix X" by the agent, it'll usually find and fix the issues.

So I've started doing it for everything from naming conventions to duplicate code to other problems. It does cost more tokens, but now I get less frustrated at having to fix basic issues in the PRs.