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Add prompt cache diagnostics and search result support

Added new optional diagnostics request/response fields to the messages API for troubleshooting prompt cache misses, along with six new cache miss reason schema types (BetaCacheMissMessagesChanged, BetaCacheMissModelChanged, BetaCacheMissPreviousMessageNotFound, BetaCacheMissSystemChanged, BetaCacheMissToolsChanged, BetaCacheMissUnavailable). Also added support for search_result blocks in managed agents with new schemas BetaManagedAgentsSearchResultBlock, BetaManagedAgentsSearchResultCitations, and BetaManagedAgentsSearchResultContent, plus a new beta feature flag cache-diagnosis-2026-04-07. All additions are optional and backward-compatible.

Alert history

  • Additive

    Add prompt cache diagnostics and search result support

    Added new optional diagnostics request/response fields to the messages API for troubleshooting prompt cache misses, along with six new cache miss reason schema types (BetaCacheMissMessagesChanged, BetaCacheMissModelChanged, BetaCacheMissPreviousMessageNotFound, BetaCacheMissSystemChanged, BetaCacheMissToolsChanged, BetaCacheMissUnavailable). Also added support for search_result blocks in managed agents with new schemas BetaManagedAgentsSearchResultBlock, BetaManagedAgentsSearchResultCitations, and BetaManagedAgentsSearchResultContent, plus a new beta feature flag cache-diagnosis-2026-04-07. All additions are optional and backward-compatible.

  • Additive

    Fast mode now supports Claude Opus 4.7

    Claude Opus 4.7 is now available in fast mode (research preview) via the claude-opus-4-7 model identifier with the fast-mode-2026-02-01 beta header. This is a new optional model choice that does not affect existing integrations using earlier models.