Source Intelligence

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.

All of v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Agent proxy adds flow control with caps and stall aborts

Under the hood
Useful2 Signal2
Agent Proxy

The local agent proxy now pauses or aborts transfers that stall or buffer too much.

What

The local agent proxy now counts queued bytes in each direction, pauses the client socket once pending upload bytes pass a high-water mark and resumes on drain, aborts a request when the pending-buffer cap is exceeded, and aborts when the tunnel accepts no request bytes within a timeout window.

Details
  • Limits come from the connection's limits object (receiveHighWater, sendPauseAfterPendingBytes); there is no flag.
  • The proxy reports each facility as enabled only when the corresponding limit is a finite number.
  • Cap breach is logged as "[agent-proxy] pending buffer cap (".
Evidence

[agent-proxy] pending buffer cap (

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 →