Log MCPServer handler exceptions by kind and keep crash details off the wire (#3314)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

tests/interaction/mcpserver/test_prompts.py

@@ -122,23 +122,25 @@ async def test_get_prompt_with_a_wrong_type_argument_is_rejected_before_the_func
     """An argument that fails the function signature's type validation is rejected before the function runs.
 
     The decorated function is wrapped in pydantic's validate_call, so a value that cannot be
-    coerced to the parameter's annotation fails before the body executes. The function body
-    raises NotImplementedError to prove it never ran. The error is wrapped in the SDK's stable
-    rendering-error prefix; the body of the message is raw pydantic output and is not asserted.
+    coerced to the parameter's annotation fails before the body executes; `ran` stays empty to
+    prove it. The client sees only the SDK's rendering-error message naming the prompt, with the
+    pydantic detail withheld.
     """
     mcp = MCPServer("prompter")
+    ran: list[str] = []
 
     @mcp.prompt()
     def repeat(phrase: str, count: int) -> str:
         """A registered prompt; type validation rejects the call before the function runs."""
-        raise NotImplementedError
+        ran.append(phrase)  # pragma: no cover
+        return phrase * count  # pragma: no cover
 
     async with connect(mcp) as client:
         with pytest.raises(MCPError) as exc_info:
             await client.get_prompt("repeat", {"phrase": "hi", "count": "many"})
 
-    assert exc_info.value.error.code == 0
-    assert exc_info.value.error.message.startswith("Error rendering prompt repeat: 1 validation error")
+    assert ran == []
+    assert exc_info.value.error == snapshot(ErrorData(code=0, message="Error rendering prompt repeat"))
 
 
 @requirement("mcpserver:prompt:optional-args")