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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 11 Aug 2026

SDK hosts can report that an auth token is unchanged

Use it now

Useful2 Signal2

SDK not in their notes

SDK hosts can say a credential is unchanged so Claude Code fails fast instead of retrying.

getHostAuthTokenmaterialUnchanged

What

The getHostAuthToken control response gains an optional materialUnchanged boolean. It is only consulted when authToken is null, meaning the credential was delivered out of band; setting it true tells Claude Code to fail fast instead of backing off and retrying.

Details

The CLI-side handler now passes an object result straight through rather than always wrapping the returned value as { authToken }.

Evidence

materialUnchanged is only consulted when authToken is null (out-of-band delivery)

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

See this entry in the whole of v2.1.228 →