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

# Muse Code

> Run Muse Code in a secure E2B sandbox with full filesystem, terminal, and git access.

[Muse Code](https://dev.meta.ai/docs/muse-code) is Meta's coding agent for the terminal and CI, built on Muse Spark. E2B provides a pre-built `muse` template with Muse Code already installed.

## CLI

Create a sandbox with the [E2B CLI](/cli).

```bash theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
e2b sbx create muse
```

Once inside the sandbox, start Muse Code.

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

## Run headless

Use `muse exec` for non-interactive mode and `--yolo` to skip approval prompts, disable Muse Code's own OS sandbox, and trust the workspace. The E2B sandbox is the isolation boundary here, so Muse Code's built-in sandbox is not needed. The sandbox isolates the agent from your host machine, but sandboxes can reach the open internet by default; restrict outbound traffic with [network rules](/network/internet-access). Muse Code authenticates with an API key from the [Meta Model API dashboard](https://dev.meta.ai) via the `META_API_KEY` environment variable.

<Note>
  Auto-approving tool calls is contained by the sandbox: the agent cannot touch your host machine, local files, or credentials. It can still make outbound network requests, since internet access is enabled by default. To limit where an auto-approved agent can connect, configure [outbound network rules](/network/internet-access) (`allowInternetAccess`, plus allow/deny lists by CIDR or hostname). Hostname rules apply to HTTP(S) traffic only; use CIDR rules for other protocols.
</Note>

<CodeGroup>
  ```typescript JavaScript & TypeScript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  import { Sandbox } from 'e2b'

  const sandbox = await Sandbox.create('muse', {
    envs: { META_API_KEY: process.env.META_API_KEY },
  })

  const result = await sandbox.commands.run(
    `muse exec --yolo "Create a hello world HTTP server in Go"`
  )

  console.log(result.stdout)
  await sandbox.kill()
  ```

  ```python Python theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  import os
  from e2b import Sandbox

  sandbox = Sandbox.create("muse", envs={
      "META_API_KEY": os.environ["META_API_KEY"],
  })

  result = sandbox.commands.run(
      'muse exec --yolo "Create a hello world HTTP server in Go"',
  )

  print(result.stdout)
  sandbox.kill()
  ```
</CodeGroup>

Add `--json` to emit machine-readable JSONL events instead of plain text, and `--max-model-steps` to cap a run that would otherwise loop.

### Example: work on a cloned repository

<CodeGroup>
  ```typescript JavaScript & TypeScript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  import { Sandbox } from 'e2b'

  const sandbox = await Sandbox.create('muse', {
    envs: { META_API_KEY: process.env.META_API_KEY },
    timeoutMs: 600_000,
  })

  await sandbox.git.clone('https://github.com/your-org/your-repo.git', {
    path: '/home/user/repo',
    username: 'x-access-token',
    password: process.env.GITHUB_TOKEN,
    depth: 1,
  })

  const result = await sandbox.commands.run(
    `cd /home/user/repo && muse exec --yolo "Add error handling to all API endpoints"`,
    { onStdout: (data) => process.stdout.write(data) }
  )

  const diff = await sandbox.commands.run('cd /home/user/repo && git diff')
  console.log(diff.stdout)

  await sandbox.kill()
  ```

  ```python Python theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  import os
  from e2b import Sandbox

  sandbox = Sandbox.create("muse", envs={
      "META_API_KEY": os.environ["META_API_KEY"],
  }, timeout=600)

  sandbox.git.clone("https://github.com/your-org/your-repo.git",
      path="/home/user/repo",
      username="x-access-token",
      password=os.environ["GITHUB_TOKEN"],
      depth=1,
  )

  result = sandbox.commands.run(
      'cd /home/user/repo && muse exec --yolo "Add error handling to all API endpoints"',
      on_stdout=lambda data: print(data, end=""),
  )

  diff = sandbox.commands.run("cd /home/user/repo && git diff")
  print(diff.stdout)

  sandbox.kill()
  ```
</CodeGroup>

## Build a custom template

If you need to customize the environment (e.g. pre-install dependencies, add config files), build your own template on top of the pre-built `muse` template.

<CodeGroup>
  ```typescript JavaScript & TypeScript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  // template.ts
  import { Template } from 'e2b'

  export const template = Template()
    .fromTemplate('muse')
  ```

  ```python Python theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  # template.py
  from e2b import Template

  template = (
      Template()
      .from_template("muse")
  )
  ```
</CodeGroup>

<CodeGroup>
  ```typescript JavaScript & TypeScript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  // build.ts
  import { Template, defaultBuildLogger } from 'e2b'
  import { template as museTemplate } from './template'

  await Template.build(museTemplate, 'my-muse', {
    cpuCount: 2,
    memoryMB: 2048,
    onBuildLogs: defaultBuildLogger(),
  })
  ```

  ```python Python theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  # build.py
  from e2b import Template, default_build_logger
  from template import template as muse_template

  Template.build(muse_template, "my-muse",
      cpu_count=2,
      memory_mb=2048,
      on_build_logs=default_build_logger(),
  )
  ```
</CodeGroup>

Run the build script to create the template.

<CodeGroup>
  ```bash JavaScript & TypeScript theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  npx tsx build.ts
  ```

  ```bash Python theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  python build.py
  ```
</CodeGroup>

## Related guides

<CardGroup cols={3}>
  <Card title="Sandbox persistence" icon="clock" href="/sandbox/persistence">
    Auto-pause, resume, and manage sandbox lifecycle
  </Card>

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

  <Card title="SSH access" icon="terminal" href="/sandbox/ssh-access">
    Connect to the sandbox via SSH for interactive sessions
  </Card>
</CardGroup>