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fix(langgraph): inherited RunnableConfig should not prevent stateKey to be read #1674

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Merged
merged 1 commit into from
Sep 18, 2025
Merged

fix(langgraph): inherited RunnableConfig should not prevent stateKey to be read #1674

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5 changes: 5 additions & 0 deletions .changeset/lazy-friends-beam.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@langchain/langgraph": patch
---

Fix `stateKey` property in `pushMessage` being ignored when RunnableConfig is automatically inherited
13 changes: 3 additions & 10 deletions libs/langgraph/src/graph/message.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,9 @@ import {
coerceMessageLikeToMessage,
} from "@langchain/core/messages";
import type { RunnableConfig } from "@langchain/core/runnables";
import { AsyncLocalStorageProviderSingleton } from "@langchain/core/singletons";
import { v4 } from "uuid";
import { StateGraph } from "./state.js";
import { ensureLangGraphConfig } from "../pregel/utils/config.js";
import type { StreamMessagesHandler } from "../pregel/messages.js";

export const REMOVE_ALL_MESSAGES = "__remove_all__";
Expand Down Expand Up @@ -123,16 +123,9 @@ export function pushMessage(
stateKey?: string | null;
}
) {
const rawOptions:
| (RunnableConfig & { stateKey?: string | null })
| undefined =
options ?? AsyncLocalStorageProviderSingleton.getRunnableConfig();
const { stateKey: userStateKey, ...userConfig } = options ?? {};
const config = ensureLangGraphConfig(userConfig);

if (rawOptions == null) {
throw new Error("Calling pushMessage outside the context of a graph.");
}

const { stateKey: userStateKey, ...config } = rawOptions;
let stateKey: string | undefined = userStateKey ?? "messages";
if (userStateKey === null) stateKey = undefined;

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