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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 v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→

Claude Code v2.1.221 3 Aug 2026

Extra HTTP/2 GOAWAY shape treated as retryable

You'll notice

Useful3 Signal0

Internals

One more kind of dropped connection now retries quietly instead of showing you an error.

What

One more form of GOAWAY-related connection failure is now classified as retryable rather than surfacing as a hard error.

Details

the http2 error classifier gained a branch for ERR_HTTP2_SESSION_ERROR
that branch also matches the message against a regex and checks the stack for a goaway frame
sits alongside the existing stream-rejected-by-goaway detection

Evidence

ERR_HTTP2_SESSION_ERROR

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

See this entry in the whole of v2.1.221 →