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AIMessage content erased when doing updateState #403

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opened 2026-02-15 18:16:28 -05:00 by yindo · 0 comments
yindo commented 2026-02-15 18:16:28 -05:00
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Originally created by @Specy on GitHub (Feb 8, 2026).

Checked other resources

  • I added a very descriptive title to this issue.
  • I searched the LangGraph.js documentation with the integrated search.
  • I used the GitHub search to find a similar question and didn't find it.
  • I am sure that this is a bug in LangGraph.js rather than my code.
  • The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package).

Example Code

import { END, MemorySaver, MessagesValue, START, StateGraph, StateSchema, } from '@langchain/langgraph';
import { AIMessage, HumanMessage } from '@langchain/core/messages';

const state = new StateGraph(
    new StateSchema({
        messages: MessagesValue,
    }),
);
const checkpointer = new MemorySaver();

const g = state
    .addNode('answerNode', (state) => {
        console.log(state);
        return {};
    })
    .addEdge(START, 'answerNode')
    .addEdge('answerNode', END)
    .compile({
        checkpointer,
    });

const id = {
    configurable: {
        thread_id: 'thread1',
    },
};
const messages = [
    new HumanMessage({
        contentBlocks: [{ type: 'text', text: 'Hello' }],
    }),
    new AIMessage({
        contentBlocks: [{ type: 'text', text: 'Hi there!' }],
    }),
    new HumanMessage({
        contentBlocks: [{ type: 'text', text: 'How are you' }],
    }),
];
async function run() {
    await g.updateState(id, {
        messages,
    });

    await g.invoke({}, id);
}

run();

Error Message and Stack Trace (if applicable)

{
  messages: [
    HumanMessage {
      "id": "a94629d1-02b3-4c2e-b8c2-863e08e26042",
      "content": [
        {
          "type": "text",
          "text": "Hello"
        }
      ],
      "additional_kwargs": {},
      "response_metadata": {
        "output_version": "v1"
      }
    },
    AIMessage {
      "id": "ddb6123c-5419-43b6-8467-2bd04880c942",
      "content": [], //<----------------
      "additional_kwargs": {},
      "response_metadata": {
        "output_version": "v1"
      },
      "tool_calls": [],
      "invalid_tool_calls": []
    },
    HumanMessage {
      "id": "656f0ebd-edd5-49c3-b763-ddd829c28526",
      "content": [
        {
          "type": "text",
          "text": "How are you"
        }
      ],
      "additional_kwargs": {},
      "response_metadata": {
        "output_version": "v1"
      }
    }
  ]
}

Description

When using langgraph, doing a .updateState while updating messages erases content inside of AIMessage.

System Info

Node version: v24.6.0
Operating system: win32 x64
Package manager: npm
Package manager version: N/A

+-- @ai-sdk/perplexity@3.0.18
+-- @aws-sdk/client-s3@3.985.0
+-- @aws-sdk/lib-storage@3.985.0
+-- @aws-sdk/s3-request-presigner@3.985.0
+-- @cartesia/cartesia-js@2.2.9
+-- @elevenlabs/elevenlabs-js@2.34.0
+-- @googleapis/youtube@31.0.0
+-- @langchain/anthropic@1.3.15
+-- @langchain/core@1.1.19
+-- @langchain/google-vertexai@2.1.15
+-- @langchain/groq@1.0.4
+-- @langchain/langgraph@1.1.4
+-- @langchain/openai@1.2.5
+-- @langchain/textsplitters@1.0.1
+-- @langchain/xai@1.3.1
+-- @llamaindex/llama-cloud@1.4.0
+-- @mendable/firecrawl-js@4.12.0
+-- @mistralai/mistralai@1.14.0
+-- @mozilla/readability@0.6.0
+-- @msgpack/msgpack@3.1.3
+-- @nestjs/axios@4.0.1
+-- @nestjs/cli@11.0.16
+-- @nestjs/common@11.1.13
+-- @nestjs/config@4.0.3
+-- @nestjs/core@11.1.13
+-- @nestjs/event-emitter@3.0.1
+-- @nestjs/jwt@11.0.2
+-- @nestjs/platform-express@11.1.13
+-- @nestjs/platform-socket.io@11.1.13
+-- @nestjs/schedule@6.1.1
+-- @nestjs/schematics@11.0.9
+-- @nestjs/swagger@11.2.6
+-- @nestjs/testing@11.1.13
+-- @nestjs/websockets@11.1.13
+-- @prisma/adapter-pg@7.3.0
+-- @prisma/client@7.3.0
+-- @qdrant/js-client-rest@1.16.2
+-- @types/bcrypt@6.0.0
+-- @types/cookie@1.0.0
+-- @types/express@5.0.6
+-- @types/jest@30.0.0
+-- @types/mime-types@3.0.1
+-- @types/multer@2.0.0
+-- @types/node@25.2.1
+-- @types/supertest@6.0.3
+-- @types/ws@8.18.1
+-- @typescript-eslint/eslint-plugin@8.54.0
+-- @typescript-eslint/parser@8.54.0
+-- @typescript/native-preview@7.0.0-dev.20260207.1
+-- ai@6.0.77
+-- apify-client@2.22.0
+-- axios@1.13.4
+-- bcrypt@6.0.0
+-- class-transformer@0.5.1
+-- class-validator@0.14.3
+-- cross-env@10.1.0
+-- dotenv@17.2.4
+-- eslint-config-nestjs@0.8.0
+-- eslint-config-prettier@10.1.8
+-- eslint-plugin-prettier@5.5.5
+-- eslint@10.0.0
+-- filenamify@7.0.1
+-- form-data@4.0.5
+-- groq-sdk@0.37.0
+-- ioredis@5.9.2
+-- jest@30.2.0
+-- langchain@1.2.18
+-- llama-cloud-services@0.5.4
+-- llamaindex@0.12.1
+-- load-esm@1.0.3
+-- mime-types@3.0.2
+-- mozilla-readability@0.1.3
+-- nestjs-spelunker@1.3.2
+-- openai@6.18.0
+-- openapi-client-axios@7.8.0
+-- p-limit@7.3.0
+-- pdf-parse@2.4.5
+-- prettier@3.8.1
+-- prisma@7.3.0
+-- prompts@2.4.2
+-- reflect-metadata@0.2.2
+-- remark-gfm@4.0.1
+-- remark-preset-lint-recommended@7.0.1
+-- remark-stringify@11.0.0
+-- remark@15.0.1
+-- rxjs@7.8.2
+-- sanitize-filename@1.6.3
+-- socket.io@4.8.3
+-- source-map-support@0.5.21
+-- supertest@7.2.2
+-- tiktoken@1.0.22
+-- ts-jest@29.4.6
+-- ts-loader@9.5.4
+-- ts-node@10.9.2
+-- ts-results@3.3.0
+-- tsconfig-paths@4.2.0
+-- typescript-eslint@8.54.0
+-- uuidv7@1.1.0
+-- voyageai@0.1.0
+-- ws@8.19.0
+-- yaml@2.8.2
+-- zod-from-json-schema@0.4.2
`-- zod@4.3.6

Originally created by @Specy on GitHub (Feb 8, 2026). ### Checked other resources - [x] I added a very descriptive title to this issue. - [x] I searched the LangGraph.js documentation with the integrated search. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangGraph.js rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package). ### Example Code ```typescript import { END, MemorySaver, MessagesValue, START, StateGraph, StateSchema, } from '@langchain/langgraph'; import { AIMessage, HumanMessage } from '@langchain/core/messages'; const state = new StateGraph( new StateSchema({ messages: MessagesValue, }), ); const checkpointer = new MemorySaver(); const g = state .addNode('answerNode', (state) => { console.log(state); return {}; }) .addEdge(START, 'answerNode') .addEdge('answerNode', END) .compile({ checkpointer, }); const id = { configurable: { thread_id: 'thread1', }, }; const messages = [ new HumanMessage({ contentBlocks: [{ type: 'text', text: 'Hello' }], }), new AIMessage({ contentBlocks: [{ type: 'text', text: 'Hi there!' }], }), new HumanMessage({ contentBlocks: [{ type: 'text', text: 'How are you' }], }), ]; async function run() { await g.updateState(id, { messages, }); await g.invoke({}, id); } run(); ``` ### Error Message and Stack Trace (if applicable) ```json { messages: [ HumanMessage { "id": "a94629d1-02b3-4c2e-b8c2-863e08e26042", "content": [ { "type": "text", "text": "Hello" } ], "additional_kwargs": {}, "response_metadata": { "output_version": "v1" } }, AIMessage { "id": "ddb6123c-5419-43b6-8467-2bd04880c942", "content": [], //<---------------- "additional_kwargs": {}, "response_metadata": { "output_version": "v1" }, "tool_calls": [], "invalid_tool_calls": [] }, HumanMessage { "id": "656f0ebd-edd5-49c3-b763-ddd829c28526", "content": [ { "type": "text", "text": "How are you" } ], "additional_kwargs": {}, "response_metadata": { "output_version": "v1" } } ] } ``` ### Description When using langgraph, doing a .updateState while updating `messages` erases content inside of AIMessage. ### System Info <details> Node version: v24.6.0 Operating system: win32 x64 Package manager: npm Package manager version: N/A -------------------- +-- @ai-sdk/perplexity@3.0.18 +-- @aws-sdk/client-s3@3.985.0 +-- @aws-sdk/lib-storage@3.985.0 +-- @aws-sdk/s3-request-presigner@3.985.0 +-- @cartesia/cartesia-js@2.2.9 +-- @elevenlabs/elevenlabs-js@2.34.0 +-- @googleapis/youtube@31.0.0 +-- @langchain/anthropic@1.3.15 +-- @langchain/core@1.1.19 +-- @langchain/google-vertexai@2.1.15 +-- @langchain/groq@1.0.4 +-- @langchain/langgraph@1.1.4 +-- @langchain/openai@1.2.5 +-- @langchain/textsplitters@1.0.1 +-- @langchain/xai@1.3.1 +-- @llamaindex/llama-cloud@1.4.0 +-- @mendable/firecrawl-js@4.12.0 +-- @mistralai/mistralai@1.14.0 +-- @mozilla/readability@0.6.0 +-- @msgpack/msgpack@3.1.3 +-- @nestjs/axios@4.0.1 +-- @nestjs/cli@11.0.16 +-- @nestjs/common@11.1.13 +-- @nestjs/config@4.0.3 +-- @nestjs/core@11.1.13 +-- @nestjs/event-emitter@3.0.1 +-- @nestjs/jwt@11.0.2 +-- @nestjs/platform-express@11.1.13 +-- @nestjs/platform-socket.io@11.1.13 +-- @nestjs/schedule@6.1.1 +-- @nestjs/schematics@11.0.9 +-- @nestjs/swagger@11.2.6 +-- @nestjs/testing@11.1.13 +-- @nestjs/websockets@11.1.13 +-- @prisma/adapter-pg@7.3.0 +-- @prisma/client@7.3.0 +-- @qdrant/js-client-rest@1.16.2 +-- @types/bcrypt@6.0.0 +-- @types/cookie@1.0.0 +-- @types/express@5.0.6 +-- @types/jest@30.0.0 +-- @types/mime-types@3.0.1 +-- @types/multer@2.0.0 +-- @types/node@25.2.1 +-- @types/supertest@6.0.3 +-- @types/ws@8.18.1 +-- @typescript-eslint/eslint-plugin@8.54.0 +-- @typescript-eslint/parser@8.54.0 +-- @typescript/native-preview@7.0.0-dev.20260207.1 +-- ai@6.0.77 +-- apify-client@2.22.0 +-- axios@1.13.4 +-- bcrypt@6.0.0 +-- class-transformer@0.5.1 +-- class-validator@0.14.3 +-- cross-env@10.1.0 +-- dotenv@17.2.4 +-- eslint-config-nestjs@0.8.0 +-- eslint-config-prettier@10.1.8 +-- eslint-plugin-prettier@5.5.5 +-- eslint@10.0.0 +-- filenamify@7.0.1 +-- form-data@4.0.5 +-- groq-sdk@0.37.0 +-- ioredis@5.9.2 +-- jest@30.2.0 +-- langchain@1.2.18 +-- llama-cloud-services@0.5.4 +-- llamaindex@0.12.1 +-- load-esm@1.0.3 +-- mime-types@3.0.2 +-- mozilla-readability@0.1.3 +-- nestjs-spelunker@1.3.2 +-- openai@6.18.0 +-- openapi-client-axios@7.8.0 +-- p-limit@7.3.0 +-- pdf-parse@2.4.5 +-- prettier@3.8.1 +-- prisma@7.3.0 +-- prompts@2.4.2 +-- reflect-metadata@0.2.2 +-- remark-gfm@4.0.1 +-- remark-preset-lint-recommended@7.0.1 +-- remark-stringify@11.0.0 +-- remark@15.0.1 +-- rxjs@7.8.2 +-- sanitize-filename@1.6.3 +-- socket.io@4.8.3 +-- source-map-support@0.5.21 +-- supertest@7.2.2 +-- tiktoken@1.0.22 +-- ts-jest@29.4.6 +-- ts-loader@9.5.4 +-- ts-node@10.9.2 +-- ts-results@3.3.0 +-- tsconfig-paths@4.2.0 +-- typescript-eslint@8.54.0 +-- uuidv7@1.1.0 +-- voyageai@0.1.0 +-- ws@8.19.0 +-- yaml@2.8.2 +-- zod-from-json-schema@0.4.2 `-- zod@4.3.6 </details>
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Reference: langchain-ai/langgraphjs#403
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