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caching

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1
Your Vary Test Passed. Production Still Dropped Accept
I had a content-negotiation test that passed. Then I asked production the same question. Production gave me the right body and the wrong evidence. That is an uncomfortable category of bug because the application appears to work. A client asking for HTML receives HTML. A client asking for Markdown receives Markdown. An…
- caching
- tooling
EN2026-08-29
2
Your Prompt Cache Reads Zero and Your Prefix Is Fine
Every guide to Anthropic prompt caching tells you the same debugging step, and it is a good one. If cache_read_input_tokens comes back zero across repeated requests with an identical prefix, something in that prefix is changing between calls. A timestamp in the system prompt. A UUID. A dict that serializes in a…
EN2026-08-18