cache-diagnostics changedbuild-with-claude/cache-diagnostics
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10811081* **Beta:** Field names and semantics may change while this feature is in beta.
10821082* **Claude API only:** Not available on Amazon Bedrock or Google Cloud.
10831083* **Limited retention:** Fingerprints for `previous_message_id` lookup expire after a short period. Run diagnostic comparisons between closely spaced requests.
1084* **Same workspace:** The previous request must have been made with an API key from the same organization and workspace. To check, compare the `anthropic-workspace-id` [response header](https://platform.claude.com/docs/en/api/overview#response-headers) on the two responses.
1084* **Same workspace:** The previous request must have run in the same organization and workspace. To check, compare the `anthropic-workspace-id` [response header](https://platform.claude.com/docs/en/api/overview#response-headers) on the two responses.
10851085* **Comparison horizon:** For very long conversations where the only change is deep in the message list, the response may be `unavailable` rather than a precise location.
10861086* **Best-effort:** Diagnostics never blocks or fails your request. If diagnostic information is not available, the response returns `unavailable`, or `cache_miss_reason: null` when the comparison was still running.
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