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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.213 ·

SDK Protocol: Heartbeat and Subagent-Retry tool_progress Filtering

Entry
JSON All of v2.1.213
EntryKind: in v2.1.213,
ImprovementsSection of the release
What

The SDK message adapter now silently drops tool_progress frames that carry heartbeat or subagent-retry payloads instead of surfacing them as messages.

Details
  • tool_progress frames with heartbeat: true or a subagent_retry object are now filtered
  • These frames exist for session keepalive and retry signaling; passing them to SDK consumers as messages caused confusion
  • A debug log entry is written: [sdkMessageAdapter] Ignoring heartbeat/subagent-retry tool_progress frame
Evidence

Filter logic (search for "[sdkMessageAdapter] Ignoring heartbeat/subagent-retry tool_progress frame")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.213 →

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