class MyHarnessMiddleware:
        def normalize(self, result: Any, tool_name: str, ctx: MiddlewareContext) -> NormalizedToolResult:
            # Convert vendor-specific result format to standard format
            if isinstance(result, MyVendorResult):
                return NormalizedToolResult(
                    content=result.data,
                    success=result.status == "ok",
                    error_message=result.error if result.status != "ok" else None,
                    metadata={
                        "vendor": "my_vendor",
                        "result_type": type(result).__name__
                    },
                    raw_result=result
                )
            return NormalizedToolResult(content=result)