Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Internal ChangesKind: in v2.1.319,
Internal ChangesSection of the release
What
MCP (Model Context Protocol) is the way Claude Code connects to outside tools and services. When a tool call to one of these fails, Claude Code sorts the error into a category. There is now an extra step after that: if the category comes with a message written for Claude and has no handler to deal with it, Claude Code raises an error that carries that message. Otherwise the handler runs as before.
Why
This is a new route by which an MCP tool failure can be reported back to Claude.
