> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blaxel.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Run LangChain on Blaxel

> Deploy LangChain and LangGraph projects to Blaxel with minimal code changes to get serverless hosting, agentic observability, and policies.

[LangChain](https://www.langchain.com/) is a composable framework to build LLM applications. It can be combined with [LangGraph](https://www.langchain.com/langgraph) which is a stateful, orchestration framework that brings added control to agent workflows. You can deploy your LangChain or LangGraph projects to Blaxel with minimal code editing (and zero configuration), enabling you to use [Serverless Deployments](../Infrastructure/Global-Inference-Network), [Agentic Observability](../Observability/Overview), [Policies](../Model-Governance/Policies), and more.

## Get started with LangChain on Blaxel

To get started with LangChain/LangGraph on Blaxel:

* if you already have a LangChain or LangGraph agent, adapt your code with [Blaxel SDK commands](../Agents/Develop-an-agent) to connect to [MCP servers](../Functions/Overview), [LLMs](../Models/Overview) and [other agents](../Agents/Overview).
* or initialize an example project in LangChain by using the following Blaxel CLI command and selecting the *LangChain hello world:*

```bash theme={null}
bl new agent
```

[Deploy](../Agents/Deploy-an-agent) it by running:

```bash theme={null}
bl deploy
```

## Develop a LangChain agent using Blaxel features

While building your agent in LangChain, use Blaxel [SDK](../sdk-reference/introduction) to connect to resources already hosted on Blaxel:

* [MCP servers](../Functions/Overview)
* [LLMs](../Models/Overview)
* [other agents](../Agents/Overview)

### Connect to MCP servers

Connect to [MCP servers](../Functions/Overview) using the Blaxel SDK to access pre-built or custom tool servers hosted on Blaxel. This eliminates the need to manage server connections yourself, with credentials stored securely on the platform.

Run the following command to retrieve tools in LangChain format:

<CodeGroup>
  ```python Python theme={null}

  from blaxel.langgraph import bl_tools

  await bl_tools(['mcp-server-name'])
  ```

  ```typescript TypeScript theme={null}

  import { blTools } from '@blaxel/langgraph';

  const tools = await blTools(['mcp-server-name'])
  ```
</CodeGroup>

### Connect to LLMs

Connect to [LLMs](../Models/Overview) hosted on Blaxel using the SDK to avoid managing model API connections yourself. All credentials remain securely stored on the platform.

<CodeGroup>
  ```python Python theme={null}

  from blaxel.langgraph import bl_model

  model = await bl_model("model-api-name")
  ```

  ```typescript TypeScript theme={null}

  import { blModel } from "@blaxel/langgraph";

  const model = await blModel("model-api-name");
  ```
</CodeGroup>

### Connect to other agents

Connect to other agents hosted on Blaxel from your code by using the [Blaxel SDK](../sdk-reference/introduction). This allows for multi-agent chaining without managing connections yourself. This command is independent of the framework used to build the agent.

<CodeGroup>
  ```python Python theme={null}

  from blaxel.core.agents import bl_agent

  response = await bl_agent("agent-name").run(input);
  ```

  ```typescript TypeScript theme={null}

  import { blAgent } from "@blaxel/core";

  const myAgentResponse = await blAgent("agent-name").run(input);
  ```
</CodeGroup>

### Host your agent on Blaxel

You can [deploy](../Agents/Deploy-an-agent) your agent on Blaxel, enabling you to use [Serverless Deployments](../Infrastructure/Global-Inference-Network), [Agentic Observability](../Observability/Overview), [Policies](../Model-Governance/Policies), and more. This command is independent of the framework used to build the agent.

Either run the following CLI command from the root of your agent repository.

```bash theme={null}
bl deploy
```

Or [connect a GitHub repository to Blaxel](../Agents/Github-integration) for automatic deployments every time you push on *main*.