Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.323,
Internal ChangesSection of the release
What
An MCP server is a connection that gives Claude Code extra tools. When one is detached, Claude Code tells the model about it. That message now has two forms, and a check picks which one is used:
One tells the model not to call that server's tools until it is attached again.
The other names a specific tool.
Why
The message tells the model how to treat the tools of a server that is no longer attached.
