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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

Some request headers now append instead of replace

Under the hood
Useful1 Signal1
API Client

A few request headers now combine values instead of the last one overwriting the rest.

What

The SDK's header merging gained a small set of names, currently x-stainless-helper, that combine by comma-joining unique trimmed values instead of the later value winning, plus a sentinel that clears a header and stops later values appending to it.

Evidence

x-stainless-helper

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 →