Guardrails in Claude.md are guides, not hard rules (e.g., 'Don't make up information' can be ignored by Claude); for critical tasks where errors are costly, you need to implement rule-based guardrails at the tool level, not the prompt level, so Claude literally cannot bypass them.

causalpending

Speaker

Unidentified Speaker — Stop Prompting Claude. Use Karpathy's Method Instead. [7zZy1QTvokM]

Evidence Quote

You could add a line that says, 'Don't make up information,' but that's a guide, not necessarily a hard rule. So, at the end of the day, AI can still ignore it.

Source

Stop Prompting Claude. Use Karpathy's Method Instead.Austin Marchese
Created: 8/13/2026, 9:47:36 AM

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