Assistant Configuration for JS Subgraphs

OSS Product Help LangGraph
1

I am able to setup assistant config for a single graph but haven’t found a way to:

  1. Set default value to the values in JS. I can see how to do that with the Pythin Configuration class but JS uses the same signature as state. When I return a default value for the annotation, I don’t see it in the LangGraph UI
  2. Set config per subgraph. Is this a missing feature? I can see how to set it for supervisors in Python but can’t find it in supervisors for JS.
2

Hacked my way through it.

Instead of Annotation, use zod. With zod, you can set default values and langraph_nodes

import { MessagesZodState } from "@langchain/langgraph";
import { z } from "zod";
import "@langchain/langgraph/zod";

new StateGraph(MessagesZodState.extend({
  classification: z.enum(["task_creation", "general", "invalid"]),
}), z.object({
  prompt: z.string().default("You are a helpful assistant that can help with tasks."),
  model: z.enum(["gpt-4o", "gpt-4o-mini"]).default("gpt-4o").langgraph.metadata({ langgraph_nodes: ["task_creation"] }),
}))
3

I also see approaches sometimes where an configuration = ensureConfig(config) function is added. The ensureConfig then initializes a valid config from the runnableconfig and sets defaults if values are missing.