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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 v2.1.227

apiKeyHelper output is validated before it is sent

You'll notice
Useful3 Signal2
Auth

Your apiKeyHelper output is now checked for junk characters and length before being used.

apiKeyHelper
What

If you use an apiKeyHelper script to supply your API key, its output is now checked for characters that cannot appear in a key and for a maximum length. Bad output makes Claude Code stop with an error telling you the script must print only the key. Previously any non-empty output was sent as-is.

Details
  • The rejection message is "apiKeyHelper output rejected: not a printable-ASCII token".
  • Failure throws rather than falling back to an unauthenticated request, so a script that prints logs or a prompt alongside the key now fails loudly instead of causing a confusing auth error.
Evidence

apiKeyHelper output rejected: not a printable-ASCII token

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 v2.1.227 →