use command in tool cause ParentCommand error #1885
Description
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
//super graph
const checkpointer = new MemorySaver();
const superGraph = new StateGraph(root_graph_state)
.addNode("supervisor", supervisor_graph, {
ends: [
"sub_A", "sub_B", "sub_C", "sub_D", END
]
})
.addNode("sub_A", sub_A)
.addEdge("sub_A", "supervisor")
//
.addNode("sub_B", sub_B)
.addEdge("sub_B", "supervisor")
.addEdge(START, "supervisor");
const compiledSuperGraph = superGraph.compile({ checkpointer });
// sub graph A
const shape_management_graph = new StateGraph(graph_state)
.addNode("router", router, { ends: ["check"] })
.addEdge(START, "router")
//
.addNode("extra_msg", extra_msg_when_needed, { ends: ["check"] })
//
.addNode("check", create_ckeck, { ends: ["extra_msg", "wirte_code"] })
//
.addNode("wirte_code", wirte_code, { ends: ["output"] })
//
.addNode("output", output)
.compile({ checkpointer: true })
//wirte_code is a react graph
const wirte_code_to_create_or_edit_shape = async (state, config) => {
const code_runner = tool(
async ({ code }, config) => {
return new Command({
update: {
_self_messages: new ToolMessage({
content: r.result,
tool_call_id: config.toolCall?.id!
}),
messages: new ToolMessage({
content: r.result,
tool_call_id: config.toolCall?.id!
}),
_work_result: {
"foo": "foo",
"bar": “bar”
}
},
goto: "output",
graph: Command.PARENT,
});
},
{
name: "code_runner",
description: "运行大模型生成的代码",
schema: z.object({
code: z.string().describe("要被执行的代码"),
}),
}
)
try {
const agent = createAgent({
model: llm,
tools: [code_runner],
systemPrompt: readFileSync("electron/main/agent/nodes/shape_manage/propmt.md", 'utf8')
});
const result = await agent.invoke(
{
messages: state.current_work.content
},
{
recursionLimit: 10
}
);
} catch (error) {
//when use try catch throw ParentCommand error
//when no try cathc , graph route to output as expect
console.log("..................");
console.log(error);
}
}
Error Message and Stack Trace (if applicable)
ParentCommand
at RunnableCallable._controlBranch [as func] (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/graph/state.js:479:47)
at file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/utils.js:39:108
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at AsyncLocalStorageProvider.runWithConfig (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/core/dist/singletons/async_local_storage/index.js:47:18)
at RunnableCallable.invoke (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/utils.js:39:63)
at Branch._route (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/graph/graph.js:41:32)
at RunnableCallable.func (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/graph/graph.js:32:24)
at file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/langgraph/dist/utils.js:39:108
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at AsyncLocalStorageProvider.runWithConfig (file:///home/an/my_projects/electron+vue+ai/electron-vite-vue/node_modules/@langchain/core/dist/singletons/async_local_storage/index.js:47:18) {
lc_error_code: undefined,
command: Command {
lg_name: 'Command',
lc_direct_tool_output: true,
graph: '形状管理|代码沙盒:8ec9c5cc-1d51-5859-8940-da8ba150461d',
update: {
_self_messages: ToolMessage {
"content": "asdasdasddasd",
"additional_kwargs": {},
"response_metadata": {},
"tool_call_id": "call_5c7c3eb368ac44d1bd6a3111"
},
messages: ToolMessage {
"content": "asdasdsadad",
"additional_kwargs": {},
"response_metadata": {},
"tool_call_id": "call_5c7c3eb368ac44d1bd6a3111"
},
_work_result: [Object]
},
resume: undefined,
goto: [ '输出' ],
[Symbol(langgraph.command)]: {
lg_name: 'Command',
lc_direct_tool_output: true,
graph: '形状管理|代码沙盒:8ec9c5cc-1d51-5859-8940-da8ba150461d',
update: [Object],
resume: undefined,
goto: [Array],
[Symbol(langgraph.command)]: [Object]
}
},
pregelTaskId: '0493c810-d0f1-5147-bb6e-ebbded75b88b'
}
Description
as code part says
when use try catch around createAgent throw ParentCommand error
//when no try catch around createAgent , graph route to output as expect**
System Info
electron-vue-vite@28.1.0 /home/an/my_projects/electron+vue+ai/electron-vite-vue
├── @langchain/anthropic@1.1.3
├── @langchain/core@1.1.8
├── @langchain/langgraph@1.0.7
├── @langchain/openai@1.1.3
├── @langfuse/langchain@4.4.2
├── @langfuse/otel@4.4.2
├── @langfuse/tracing@4.4.2
├── @opentelemetry/sdk-node@0.208.0
├── @turf/turf@7.3.1
├── @types/cesium@1.67.14
├── @types/node@24.5.2
├── @vitejs/plugin-vue@5.2.4
├── @zilliz/milvus2-sdk-node@2.5.10
├── axios@1.10.0
├── b-spline@2.0.2
├── cesium@1.136.0
├── dotenv@17.2.3
├── electron-builder@24.13.3
├── electron@37.4.0
├── element-plus@2.10.2
├── geotiff@2.1.4-beta.0
├── h3-js@4.4.0
├── ioredis@5.8.0
├── langchain@1.2.3
├── md5@2.3.0
├── mermaid@11.7.0
├── ol@10.6.1
├── tslab@1.0.22
├── typescript@5.9.2
├── vite-plugin-electron-renderer@0.14.6
├── vite-plugin-electron@0.28.8
├── vite@5.4.19
├── vue-element-plus-x@1.3.7
├── vue-tsc@2.2.12
├── vue@3.5.20
├── yaml@2.8.2
└── zod@4.1.13