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 v2.1.307,
Internal ChangesSection of the release
What
MCP tools are extra tools supplied by separate programs called MCP servers. When a call to one of them fails with a particular kind of error, Claude Code now treats it as a call that was stopped rather than one that went wrong, in either of these cases:
the call may not have run at all
the tool marks itself as read-only with readOnlyHint
Before, only one narrower case was handled this way.
Why
Read-only tools, and calls that never got going, should now fail more quietly when a call is aborted or retried.
