fix(MCP): Added error status to traces in MCP server for tool calls (#2914)

Signed-off-by: Felix George <[email protected]>

Author: fali007

packages/opentelemetry-instrumentation-mcp/opentelemetry/instrumentation/mcp/instrumentation.py

@@ -250,6 +250,11 @@ async def send(self, item: Any) -> Any:
                 span.set_attribute(
                     SpanAttributes.MCP_RESPONSE_VALUE, f"{serialize(request.result)}"
                 )
+                if hasattr(request.result, "isError"):
+                    if request.result.isError is True:
+                        span.set_status(
+                            Status(StatusCode.ERROR, f"{serialize(request.result)}")
+                        )
             if hasattr(request, "id"):
                 span.set_attribute(SpanAttributes.MCP_REQUEST_ID, f"{request.id}")