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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.213 17 Jul 2026

SDK Protocol: Heartbeat and Subagent-Retry tool_progress Filtering

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 →