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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 v2.1.221

HTTP status codes read from the error's status instead of its code

You'll notice
Useful3 Signal0
MCP

Fixes MCP re-authentication misfiring by reading the real HTTP status instead of guessing from messages.

What

MCP auth-challenge classification is now driven by the HTTP error's status property rather than its code field.

Details
  • Auth-challenge classification for sse/http/claudeai-proxy connect failures and the ENDPOINT_NOT_FOUND special case prefer .status, falling back to .code.
  • The claudeai-proxy 401/403 re-auth path does the same.
  • The GET-stream 404 check no longer matches on the message text.
Evidence

get_stream_404_not_reinit

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

See this entry in the whole of v2.1.221 →