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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 failures are summarised after a command runs

You'll notice
Useful3 Signal3
Agent Proxy

Proxy connection failures during a command are summarised afterwards, grouped by host, with a curl pointer.

What

If connections through the agent proxy fail while a command runs, Claude Code now appends a summary of them to the output, grouped by host and failure kind, with a curl URL for the full detail. It only appears when a proxy status URL is configured.

Details
  • Failure kinds distinguished include TLS to the relay, a rejected CONNECT, a tunnel closed mid-exchange, and a blocked or timed-out destination.
  • Also emits a telemetry event tengu_agent_proxy_failure_note carrying the failure count and the most recent kind.
  • Silent when no status URL is set, so nothing is appended in setups without a proxy.
Evidence

While this command ran, ${n} ${C(n, "connection")} through the agent proxy failed:

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 →