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2026-04-02-claude-auto-caching-tracer.md

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2026-04-02-claude-auto-caching-tracer.md

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Automatic caching for Claude 4.6; tracer timestamps and round index

  • Date: 2026-04-02
  • Type: feature
  • Scope: claude4_6, integration/tracer, types, base_client, gpt5_4
  • PR: #95, #96

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What changed

  • Claude 4.6 switched to automatic prompt caching by moving cache_control from message content items to a top-level API parameter (#95); Bedrock still uses per-message cache control.
  • UniMessage/UniEvent gained created_at timestamps, and the tracer tracks message rounds (#96).

Backfilled when the changelog was reorganized by release version; see the git history of the release range for full context.