langchain-ai/langgraph · error · LangGraphDeprecatedSinceV10

`config_type` is deprecated and will be removed. Please use

Error message

`config_type` is deprecated and will be removed. Please use `context_schema` instead.

What it means

Error "`config_type` is deprecated and will be removed. Please use `context_schema` instead." thrown in langchain-ai/langgraph.

Source

Thrown at libs/langgraph/langgraph/pregel/main.py:789

        step_timeout: float | None = None,
        debug: bool | None = None,
        checkpointer: Checkpointer = None,
        store: BaseStore | None = None,
        cache: BaseCache | None = None,
        retry_policy: RetryPolicy | Sequence[RetryPolicy] = (),
        cache_policy: CachePolicy | None = None,
        context_schema: type[ContextT] | None = None,
        config: RunnableConfig | None = None,
        trigger_to_nodes: Mapping[str, Sequence[str]] | None = None,
        node_error_handler_map: Mapping[str, str] | None = None,
        name: str = "LangGraph",
        stream_transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
        **deprecated_kwargs: Unpack[DeprecatedKwargs],
    ) -> None:
        if (
            config_type := deprecated_kwargs.get("config_type", MISSING)
        ) is not MISSING:
            warnings.warn(
                "`config_type` is deprecated and will be removed. Please use `context_schema` instead.",
                category=LangGraphDeprecatedSinceV10,
                stacklevel=2,
            )

            if context_schema is None:
                context_schema = cast(type[ContextT], config_type)

        checkpointer = ensure_valid_checkpointer(checkpointer)

        self.nodes = {
            k: v.build() if isinstance(v, NodeBuilder) else v for k, v in nodes.items()
        }
        self.channels = channels or {}
        if TASKS in self.channels and not isinstance(self.channels[TASKS], Topic):
            raise ValueError(
                f"Channel '{TASKS}' is reserved and cannot be used in the graph."
            )

View on GitHub (pinned to 38031739e5)

When it happens

Trigger: Thrown at libs/langgraph/langgraph/pregel/main.py:789 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of langchain-ai/langgraph@38031739e5 (2026-08-26). Data as JSON: /api/errors/169104bdc35db01e. Report an issue: GitHub.