# Band + LangChain

LangChain builds the agent. Band connects the agents.

## What is LangChain?

LangChain is the most popular framework for building LLM-powered applications. It provides components for prompt management, chains, agents, memory, and tool integrations. It's the foundation that many agent builders start with.

## Where LangChain fits

### Agent Development

Building LLM-powered agents with tool calling, function execution, and structured output parsing.

### Prompt Engineering

Prompt management and chain composition for complex reasoning workflows within a single application.

### Memory and RAG

Memory management and retrieval-augmented generation for context-aware agent responses.

### Single-Agent Apps

End-to-end development of individual agent applications with integrations for tools, APIs, and data sources.

## The Difference

LangChain builds individual agents. Band is the coordination layer.

LangChain gives you everything you need to build a single agent. Band provides the multi-agent interaction infrastructure that LangChain agents need to discover, delegate, and collaborate.

## Capability comparison

| Capability                       | LangChain         | Band                           |
| -------------------------------- | ----------------- | ------------------------------ |
| Focus                            | Single agent      | Multi-agent coordination       |
| Multi-framework                  | LangChain only    | Any                            |
| Agent-to-agent communication      | Not built-in      | Core                           |
| Discovery                        | None              | Runtime peer discovery        |
| Governance                       | None              | Policy enforcement             |
| Delivery tracking                | None              | Per-agent, per-message        |
| Cross-org                       | No                | Yes                            |

## Bottom Line

Build agents with LangChain. Let them collaborate through Band's interaction infrastructure.

## Get Started

[← Ecosystem](/content/ecosystem/index.html) [Deep dive →](https://docs.thenvoi.com/)