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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 v2.1.224

Sandbox proxy credentials are unique per sandbox instance

You'll notice
Useful3 Signal2
Sandbox

Concurrent sandboxes now get unique proxy usernames instead of sharing one identity.

HTTP_PROXYALL_PROXYCLOUDSDK_PROXY_USERNAME
What

Proxy settings injected into the sandbox (HTTP_PROXY, ALL_PROXY, CLOUDSDK_PROXY_USERNAME, and the socat/ssh ProxyCommand) now use a username with an instance suffix rather than the fixed srt, so concurrent sandboxes no longer share one identity. If the suffixed name would exceed 255 bytes it falls back to plain srt.

Evidence

CLOUDSDK_PROXY_USERNAME=

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 v2.1.224 →