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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 v2.1.248

Stalled WebSocket sends are now detected instead of hanging

You'll notice
Useful3 Signal2
Session Transport

A WebSocket whose outgoing buffer never drains is now detected after 60 seconds instead of hanging.

What

The WebSocket transport gained a 60 second send stall timeout (sendStallTimeoutMs: 60000) plus receive-side high and low watermarks and a queued-download byte report. A socket whose outgoing buffer never drains is now identified rather than waiting forever.

Details
  • When the send path pauses to wait for a drain, it records how much was buffered and when the wait started, which is what the timeout is measured against.
  • sendPauseAfterPendingBytes defaults to 0.
  • No gate; this applies to all WebSocket traffic.
Evidence

sendStallTimeoutMs

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 v2.1.248 →