A custom argument validator that raises something other than
ValidationError escaped Tool.run unwrapped, losing the "Error executing
tool" prefix and the UnexpectedToolError type. It is now wrapped as a
crash, and an MCPError raised there still passes through.
A ResourceError (usually ResourceNotFoundError from ctx.read_resource)
that escapes a tool body is now classified like a ToolError, since it is
the same anticipated outcome resources/read logs at INFO. An
UnexpectedResourceError escaping a tool stays a crash.
MCPServer.read_resource is now the single place a resource crash is
wrapped (plus create_resource for templates), so the built-in Resource
types let the original exception propagate to direct callers.
Also: trimmed raise-site comments in favour of the exception docstrings,
reworded the ToolError and ResourceError docstrings, documented the
FunctionResource/FileResource.read change in migration.md, corrected the
uri-templates tip and example, and pinned the new cases in tests
(including a wire test for ResourceNotFoundError from a static resource).
Max Isbey