{"record":{"id":"05aa299928fcad14","repo":"langchain-ai/langgraph","slug":"invalid-managed-channels-detected-in-schema-name","errorCode":null,"errorMessage":"Invalid managed channels detected in {schema_name}: {names}. Managed channels are not permitted in Input/Output schema.","messagePattern":"Invalid managed channels detected in (.+?): (.+?)\\. Managed channels are not permitted in Input/Output schema\\.","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"libs/langgraph/langgraph/graph/state.py","lineNumber":350,"sourceCode":"            defaults.error_handler = error_handler\n        if timeout is not None:\n            defaults.timeout = coerce_timeout_policy(timeout)\n        return self\n\n    @property\n    def _all_edges(self) -> set[tuple[str, str]]:\n        return self.edges | {\n            (start, end) for starts, end in self.waiting_edges for start in starts\n        }\n\n    def _add_schema(self, schema: type[Any], /, allow_managed: bool = True) -> None:\n        if schema not in self.schemas:\n            _warn_invalid_state_schema(schema)\n            channels, managed, type_hints = _get_channels(schema)\n            if managed and not allow_managed:\n                names = \", \".join(managed)\n                schema_name = getattr(schema, \"__name__\", \"\")\n                raise ValueError(\n                    f\"Invalid managed channels detected in {schema_name}: {names}.\"\n                    \" Managed channels are not permitted in Input/Output schema.\"\n                )\n            self.schemas[schema] = {**channels, **managed}\n            for key, channel in channels.items():\n                if key in self.channels:\n                    if self.channels[key] != channel:\n                        if isinstance(channel, LastValue):\n                            pass\n                        else:\n                            raise ValueError(\n                                f\"Channel '{key}' already exists with a different type\"\n                            )\n                else:\n                    self.channels[key] = channel\n            for key, managed in managed.items():\n                if key in self.managed:\n                    if self.managed[key] != managed:","sourceCodeStart":332,"sourceCodeEnd":368,"githubUrl":"https://github.com/langchain-ai/langgraph/blob/38031739e551638e373fb553453256c23feeb41f/libs/langgraph/langgraph/graph/state.py#L332-L368","documentation":"Error \"Invalid managed channels detected in {schema_name}: {names}. Managed channels are not permitted in Input/Output schema.\" thrown in langchain-ai/langgraph.","triggerScenarios":"Thrown at libs/langgraph/langgraph/graph/state.py:350 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"38031739e551638e373fb553453256c23feeb41f","analyzedAt":"2026-08-26T18:02:49.312Z","schemaVersion":2},"datasetVersion":"2026-08-26T21:11:00.512Z"}