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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 v2.1.236

IPv6 hosts through the proxy

You'll notice
Useful3 Signal2
Sandbox

IPv6 destinations now work correctly through the proxy instead of getting a malformed host.

What

The proxy now rewrites the forwarded Host header from the resolved address, wrapping IPv6 literals in brackets and appending the port, so IPv6 destinations are formed correctly. One connection-error branch destroys the socket instead of always trying to write a 500 response.

Evidence

Error handling CONNECT:

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 v2.1.236 →