Claude Code v2.1.221 ·
MCP server details show the negotiated protocol version
MCP server details now show the protocol version negotiated with each connected server.
Use it nowTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.221,
What probably matters to youSection of the release
What
The remote/HTTP and stdio server detail panels now display which MCP protocol version was agreed with the server.
Details
- Adds a "Protocol:" row to both detail panels.
- Shown only when the client is connected, its
protocolEra is "modern", and a negotiatedProtocolVersion is present. - Hidden in every other case, including legacy-era clients.
Evidence
"Protocol:"
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 →
