- In short
- The four-layer request logging model captures, for every production Claude call, the request (model version, input token count, prompt identifier), the response (output token count, latency, stop reason), the context (user role, session ID, cache status), and the outcome (whether downstream systems accepted the output). Each layer answers a different question during an incident investigation, and missing any one leaves a blind spot that cannot be reconstructed after the fact.
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