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Instructions are not guardrails. Best case, that just makes it less likely to do it

What exactly are guardrails then? Impenetrable barriers that can never be overcome?

Deterministic assurances on top of nondeterministic tools

That’s exactly what guardrails must be if they are to be useful or trustworthy. Deterministic, enforceable and impenetrable.

Even Claude admits this after a bit of prodding.