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# Agents

Note

Conceptual Guide

Some applications will require not just a predetermined chain of calls to LLMs/other tools, but potentially an unknown chain that depends on the user’s input. In these types of chains, there is a “agent” which has access to a suite of tools. Depending on the user input, the agent can then decide which, if any, of these tools to call.

In this section of documentation, we first start with a Getting Started notebook to cover how to use all things related to agents in an end-to-end manner.

We then split the documentation into the following sections:

Tools

An overview of the various tools LangChain supports.

Agents

An overview of the different agent types.

Toolkits

An overview of toolkits, and examples of the different ones LangChain supports.

Agent Executor

An overview of the Agent Executor class and examples of how to use it.

## Go Deeper

- Tools
- Agents
- Toolkits
- Agent Executors