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.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeFixed /mcp menu hiding OAuth Authenticate/Re-authenticate actions for servers configured with headersHelper, and HTTP/SSE MCP servers with…
