AI calls methods and fields that don't exist

1. Check the problem

The model references methods or fields that don't exist in your version, silent until that path runs. Turn on a type checker (`tsc --noEmit`, mypy) to fail at build time, and feed it real docs via Context7 MCP.

2. Use the prompt

I'm on [library] version [X]. Before I trust this code, verify that every method, field, and option it uses actually exists in that version, not a hallucinated or renamed API. If you're not confident your training is current, say so and ask me to paste the docs. Then run the type checker and fix anything that doesn't resolve.

3. Verify the fix

Review the proposed diff, run the relevant checks and exercise the original failing flow before merging.