You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Bug FixesKind: in v2.1.309,
Bug FixesSection of the release
What
MCP (Model Context Protocol) is the standard Claude Code uses to connect to outside tool servers. When an MCP server needs you to sign in first, Claude Code holds a placeholder entry for it until you do.
Claude Code regularly asks each server for its list of tools. When that request fails and the server is still only a placeholder waiting for sign-in, Claude Code now clears its stored copy of that server's tools and stops there. It no longer applies the failed result. Before, the failed result was applied anyway.
Why
A brief error from a server you have not signed in to yet no longer wipes out its placeholder tools.
