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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 v2.1.229

Proxy keepalive pings during silent gaps

You'll notice
Useful3 Signal2
Proxy

Long thinking pauses no longer trip idle timeouts, because the proxy sends periodic pings.

What

The local Anthropic-shaped proxy now sends a periodic SSE ping event whenever the upstream has gone quiet, so long thinking pauses no longer trip client or proxy idle timeouts. The stream wrapper takes a keepalive interval and enqueues a pre-encoded ping frame.

Details
  • The bundled Bedrock proxy guidance document was updated to state the same requirement for third-party proxies.
Evidence

emit your own \event: ping\ during silent gaps

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.229 →