description: Use a chain as allowed tool for agent.

Chain Tool

The Chain Tool node is a component that allows the use of a LangChain chain as a tool for an agent. It provides a way to integrate complex chain-based operations into agent workflows.

A chain tool is a special type of step within a chain that allows the AI to access and utilize external resources—such as APIs, databases, calculators, or search engines—dynamically during the reasoning process

Parameters

Input

1. Chain Name

   • Type: string

   • Description: A unique identifier for the chain tool

   • Example: “state-of-union-qa”

2. Chain Description

   • Type: string

   • Description: A detailed description of what the chain does and when it should be used

   • Example: “State of the Union QA - useful for when you need to ask questions about the most recent state of the union address.”

3. Return Direct

   • Type: boolean

   • Optional: Yes

   • Description: Determines whether the tool should return its result directly or wrap it in a response

4. Base Chain

   • Type: BaseChain

   • Description: The LangChain chain to be used as the core functionality of this tool

Output

• The node outputs a ChainTool object that can be used in agent configurations.

Functionality

The ChainTool node creates a tool that wraps a LangChain chain, allowing it to be used as part of an agent’s toolkit. This enables the agent to leverage complex chain-based operations when needed.

Key aspects of its functionality include:

1. Naming and describing the tool for clear identification by the agent

2. Integrating a BaseChain object as the core functionality

3. Optional direct return of results, bypassing standard response formatting

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