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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 v2.1.118 22 Apr 2026

MCP Server Authentication Improvements

When an MCP server returns 401, the error message now offers an "Authenticate" option for OAuth-capable servers: "requires authentication. Use 'Authenticate' if the upstream server uses OAuth, or check the headersHelper script and use 'Reconnect'." The previous version only suggested checking the headersHelper script.

Evidence

Updated authentication message (search for "Use 'Authenticate' if the upstream server uses OAuth").

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

See this entry in the whole of v2.1.118 →