You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
AuthArea: what it touches
New FeaturesKind: in v2.1.227,
New FeaturesSection of the release
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.
