langchain/tools/graphql/tool.py/BaseGraphQLTool/_run
class BaseGraphQLTool:    def _run(
        self,
        tool_input: str,
        run_manager: Optional[CallbackManagerForToolRun] = None,
    ) -> str:
        result = self.graphql_wrapper.run(tool_input)
        return json.dumps(result, indent=2)