> ## Documentation Index
> Fetch the complete documentation index at: https://e2b.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# LangChain Open SWE

> Use E2B sandboxes as the execution environment for Open SWE, LangChain's open-source coding agent framework.

[Open SWE](https://github.com/langchain-ai/open-swe) is LangChain's open-source framework for building your org's internal coding agent, built on [LangGraph](https://langchain-ai.github.io/langgraph/) and [Deep Agents](https://github.com/langchain-ai/deepagents). Every task runs in an isolated cloud sandbox where the agent gets full shell access — and E2B is a supported sandbox provider out of the box.

## Get started

<Steps>
  <Step title="Clone and install Open SWE">
    ```bash theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
    git clone https://github.com/langchain-ai/open-swe.git
    cd open-swe
    uv venv
    source .venv/bin/activate
    uv sync --all-extras
    ```
  </Step>

  <Step title="Set the sandbox provider to E2B">
    Get your API key from the [E2B dashboard](https://e2b.dev/dashboard?tab=keys) and create a `.env` file in the repo root — `langgraph dev` loads it automatically:

    ```bash .env theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
    SANDBOX_TYPE="e2b"
    E2B_API_KEY="e2b_***"       # get yours at https://e2b.dev/dashboard
    E2B_TEMPLATE="my-template"  # optional: custom sandbox template

    # === LLM ===
    OPENAI_API_KEY=""           # default model is openai:gpt-5.6-sol
    ANTHROPIC_API_KEY=""        # when using anthropic: models
    ```

    You need an API key for at least one LLM provider — the default model is `openai:gpt-5.6-sol`, and you can switch with `LLM_MODEL_ID` (e.g. `LLM_MODEL_ID="anthropic:claude-sonnet-5"`). Google and Fireworks are also supported — see the [full environment variable reference](https://github.com/langchain-ai/open-swe/blob/main/docs/INSTALLATION.md#6-environment-variables) for LangSmith tracing, GitHub App, and trigger configuration.

    No other sandbox changes are needed — Open SWE creates and manages the sandboxes for you.
  </Step>

  <Step title="Run the backend">
    Open SWE's backend is a LangGraph app served together with its webhook API:

    ```bash theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
    langgraph dev
    ```

    The full deployment (GitHub App, webhooks, dashboard) is covered in the [installation guide](https://github.com/langchain-ai/open-swe/blob/main/docs/INSTALLATION.md).
  </Step>

  <Step title="Watch the sandboxes">
    As Open SWE picks up tasks, you can watch it create and reuse sandboxes with the [E2B CLI](/docs/cli):

    ```bash theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
    e2b sandbox list --state running
    ```
  </Step>
</Steps>

## Custom templates

By default, sandboxes start from the E2B base template. To pre-install languages, frameworks, or internal tools your repositories depend on — and cut setup time per agent run — build a [custom template](/docs/template/quickstart) and point Open SWE at it:

```bash theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
E2B_TEMPLATE="your-template-id-or-name"
```

## Learn more

* [Open SWE installation guide](https://github.com/langchain-ai/open-swe/blob/main/docs/INSTALLATION.md)
* [Open SWE customization guide](https://github.com/langchain-ai/open-swe/blob/main/docs/CUSTOMIZATION.md#using-a-different-sandbox-provider) — switching sandbox providers
* [Announcement blog post](https://blog.langchain.com/open-swe-an-open-source-framework-for-internal-coding-agents/)

## Related guides

<CardGroup cols={3}>
  <Card title="Templates" icon="layer-group" href="/docs/template/quickstart">
    Build custom sandbox templates with pre-installed dependencies
  </Card>

  <Card title="Sandbox persistence" icon="clock" href="/docs/sandbox/persistence">
    Auto-pause, resume, and manage sandbox lifecycle
  </Card>

  <Card title="Git integration" icon="code-branch" href="/docs/sandbox/git-integration">
    Clone repos, manage branches, and push changes
  </Card>
</CardGroup>