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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Agent proxy tests egress with a real WebSocket handshake

Under the hood
Useful2 Signal2
Agent Proxy

The agent proxy detects blocked outbound traffic more reliably using a real WebSocket test.

What

The proxy's egress check now stands up a loopback server, performs an actual WebSocket upgrade and pushes data through it, watching whether the send buffer backs up, which detects outbound traffic being blocked more reliably than a plain connection attempt.

Details
  • the handshake gives up after a timeout and reports that instead of hanging
  • runs as part of proxy startup and diagnostics
Evidence

handshake timeout

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 v2.1.251 →