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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 v2.1.228

Host auth token refresh hands back the full response

Not switched on
Useful2 Signal3
Agents Notable not in their notes

Host auth token refresh now returns the whole response, but only registers when an environment variable is set.

The host auth refresh callback is only wired up when CLAUDE_CODE_SDK_HAS_HOST_AUTH_REFRESH is set, so it does nothing otherwise.

CLAUDE_CODE_SDK_HAS_HOST_AUTH_REFRESH
What

The SDK control request for a host auth token refresh now resolves the whole control response rather than pulling the token field out of it, leaving that to the callback. The refresh callback is only registered when CLAUDE_CODE_SDK_HAS_HOST_AUTH_REFRESH is set, so nothing happens here otherwise.

Evidence

host_auth_token_refresh

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 v2.1.228 →