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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Work secret parsing rejects certificate and executable credential sources

Under the hood
Useful2 Signal3
Credentials

Session credentials backed by certificates or executables are now refused with named reasons.

What

The credential payload used to start a session is now validated more strictly. It follows a bounded chain of nested credential sources and refuses X.509 certificate and executable-backed sources outright, with named failure reasons instead of generic errors. Always on.

Details
  • Named verdicts: secret_did_not_decode, unsupported_version, missing_session_ingress_token, missing_api_base_url.
  • Failures now carry a dedicated shape-error type rather than an untyped throw.
Evidence

an X.509 certificate credential source cannot be excluded from the shell

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 v2.1.251 →