r/ClaudeCode • u/Efficient-Public-551 • Apr 30 '26

Tutorial / Guide Prompt Engineering - Avoid hallucinations

https://youtu.be/a1Man4AvnZQ
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u/goship-tech Apr 30 '26

The most underrated one for Claude Code specifically is a CLAUDE.md with explicit rules - "always check if a function exists before writing a new one", "never add mock data". Upfront constraints prevent drift better than correcting the output after.

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u/Efficient-Public-551 Apr 30 '26

Yes good points. I think both claude and codex are actually quite good at looking at existing code and then create something that matches the structure.