[langchain]: Getting GRAPH_RECURSION_LIMIT error for Full Example code in QuickStart #2014
Description
Type of issue
issue / bug
Language
JavaScript
Description
https://docs.langchain.com/oss/javascript/langchain/quickstart#example-using-json-schema-for-tool-input
/Users/prabhatkumar/Documents/playground/free-llm-usage/node_modules/@langchain/langgraph/src/pregel/index.ts:2290
throw new GraphRecursionError(
^
GraphRecursionError: Recursion limit of 25 reached without hitting a stop condition. You can increase the limit by setting the "recursionLimit" config key.
Troubleshooting URL: https://docs.langchain.com/oss/javascript/langgraph/GRAPH_RECURSION_LIMIT/
at CompiledStateGraph._runLoop (/Users/prabhatkumar/Documents/playground/free-llm-usage/node_modules/@langchain/langgraph/src/pregel/index.ts:2290:15)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async createAndRunLoop (/Users/prabhatkumar/Documents/playground/free-llm-usage/node_modules/@langchain/langgraph/src/pregel/index.ts:2121:9) {
lc_error_code: 'GRAPH_RECURSION_LIMIT'
}
Node.js v20.18.0
sharing below the code
`import "dotenv/config";
import { createAgent, tool, initChatModel, type ToolRuntime } from "langchain";
import { MemorySaver } from "@langchain/langgraph";
import * as z from "zod";
import { ChatOpenAI } from "@langchain/openai";
// Define system prompt
const systemPrompt = `You are an expert weather forecaster, who speaks in puns.
You have access to two tools:
- get_weather_for_location: use this to get the weather for a specific location
- get_user_location: use this to get the user's location
If a user asks you for the weather, make sure you know the location. If you can tell from the question that they mean wherever they are, use the get_user_location tool to find their location.`;
// Define tools
const getWeather = tool(
({ city }) => It's always sunny in ${city}!,
{
name: "get_weather_for_location",
description: "Get the weather for a given city",
schema: z.object({
city: z.string(),
}),
}
);
type AgentRuntime = ToolRuntime<unknown, { user_id: string }>;
const getUserLocation = tool(
(_, config: AgentRuntime) => {
const { user_id } = config.context;
return user_id === "1" ? "Florida" : "SF";
},
{
name: "get_user_location",
description: "Retrieve user information based on user ID",
schema: z.object({}),
}
);
// Configure model
const model = new ChatOpenAI({
model: "mistralai/devstral-2512:free",
apiKey: process.env.OPENROUTER_API_KEY!,
configuration: {
baseURL: "https://openrouter.ai/api/v1",
},
});
// Define response format
const responseFormat = z.object({
punny_response: z.string(),
weather_conditions: z.string().optional(),
});
// Set up memory
const checkpointer = new MemorySaver();
// Create agent
const agent = createAgent({
model,
systemPrompt,
responseFormat,
checkpointer,
tools: [getUserLocation, getWeather],
});
// Run agent
// thread_id is a unique identifier for a given conversation.
const config = {
configurable: { thread_id: "1" },
context: { user_id: "1" },};
const response = await agent.invoke(
{ messages: [{ role: "user", content: "what is the weather outside?" }] },
config
);
console.log(response.structuredResponse);
// {
// punny_response: "Florida is still having a 'sun-derful' day! The sunshine is playing 'ray-dio' hits all day long! I'd say it's the perfect weather for some 'solar-bration'! If you were hoping for rain, I'm afraid that idea is all 'washed up' - the forecast remains 'clear-ly' brilliant!",
// weather_conditions: "It's always sunny in Florida!"
// }
// Note that we can continue the conversation using the same thread_id.
const thankYouResponse = await agent.invoke(
{ messages: [{ role: "user", content: "thank you!" }] },
config
);
console.log(thankYouResponse.structuredResponse);
// {
// punny_response: "You're 'thund-erfully' welcome! It's always a 'breeze' to help you stay 'current' with the weather. I'm just 'cloud'-ing around waiting to 'shower' you with more forecasts whenever you need them. Have a 'sun-sational' day in the Florida sunshine!",
// weather_conditions: undefined
// }`