You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
MCPArea: what it touches
ImprovementsKind: in v2.1.321,
ImprovementsSection of the release
What
MCP (Model Context Protocol) is a way to connect outside tools to Claude Code. The error raised when an MCP tool's result arrives without its text now says more:
A result that is too large arrives this way
The tool may already have run
Claude should check before running it again, and ask for less data
Why
Some tools change things when they run, such as sending a message or editing a record. This message stops Claude from blindly running such a tool a second time.
