Under the hoodTier: how much it should matter to you
4Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.288,
What probably matters to youSection of the release
What
Replies from the model are made of blocks of different types. Claude Code now handles a block type called mcp_tool_listing, next to the existing blocks for MCP tool calls and results. MCP, the Model Context Protocol, is a standard way to connect Claude to outside tools.
Why
This points to a new way for the model to report which MCP tools it has.
