How to Create a Node in LangGraph for a Static Chain Like Text-to-SQL Alongside an Agent Node?

[quartermaine]

I'm working on a project using LangGraph, and I want to create a graph with two nodes:

• Node 1: A static node that executes a predefined chain, specifically a Text-to-SQL chain (e.g., converts a natural language question into an SQL query and executes it).
• Node 2: An agent node that answers general questions about the dataset using LangChain tools and reasoning.

The challenge I'm facing is that most LangGraph examples I've seen seem to focus on using agents for nodes, but I need one of my nodes to execute a static chain (like Text-to-SQL) without behaving as an agent.

My Question:

• Can LangGraph handle nodes that execute static chains instead of agents?
• If yes, how can I set up such a node in LangGraph?

Here’s a simplified version of what I envision:

• Node 1 runs the Text-to-SQL chain (static and predefined).
• Node 2 is an agent that dynamically answers user queries based on the dataset.

Any guidance, code snippets, or suggestions on structuring this graph would be greatly appreciated!