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

# Mastra

> Give a Mastra agent persistent Stagehand browser tools over MCP/stdio.

The Mastra integration connects an agent to the Stagehand facade MCP server over MCP/stdio. The MCP client remains open for the agent run, so browser state survives across tool calls.

<Note>
  Stagehand ships this experimental integration from the repository rather than publishing it as a standalone adapter.
</Note>

## Prerequisites

* Node.js 24 or newer
* pnpm 11.10.0
* An OpenAI API key for the example agent
* A current Google Chrome installation for local browser mode

## Quickstart

<Steps>
  <Step title="Clone and build Stagehand">
    ```bash theme={null}
    git clone https://github.com/browserbase/stagehand.git
    cd stagehand
    corepack pnpm@11.10.0 install --frozen-lockfile
    corepack pnpm@11.10.0 exec turbo run build \
      --filter @browserbasehq/stagehand-integrations
    ```
  </Step>

  <Step title="Configure the Mastra agent">
    ```bash theme={null}
    export OPENAI_API_KEY="your-openai-api-key"
    ```

    Set `MASTRA_STAGEHAND_MODEL` to select another model supported by the example.
  </Step>

  <Step title="Choose the browser">
    The example uses local Chrome by default. To use Browserbase instead:

    ```bash theme={null}
    export STAGEHAND_BROWSER="browserbase"
    export BROWSERBASE_API_KEY="your-browserbase-api-key"
    ```
  </Step>

  <Step title="Run a browser task">
    ```bash theme={null}
    corepack pnpm@11.10.0 --dir packages/integrations/mastra start -- \
      "Open https://example.com and report the page title."
    ```
  </Step>
</Steps>

## Configuration

| Variable                  | Purpose                                                                                          |
| ------------------------- | ------------------------------------------------------------------------------------------------ |
| `MASTRA_STAGEHAND_MODEL`  | Mastra agent model.                                                                              |
| `OPENAI_API_KEY`          | Credential for the example agent. Mastra does not forward it to the MCP child.                   |
| `STAGEHAND_BROWSER`       | Select `local` or `browserbase`.                                                                 |
| `BROWSERBASE_API_KEY`     | Required for Browserbase.                                                                        |
| `BROWSERBASE_PROJECT_ID`  | Optional Browserbase project ID.                                                                 |
| `STAGEHAND_MODEL_NAME`    | Optional model for Stagehand AI methods called inside `run`.                                     |
| `STAGEHAND_MODEL_API_KEY` | Required with `STAGEHAND_MODEL_NAME`; the MCP child does not receive agent-provider credentials. |

## Keep the browser session alive

The example creates one MCP client and one facade MCP server for the entire model loop. Preserve that lifetime if you adapt the integration; a new process per tool call starts a new browser.

The MCP child receives only Stagehand and Browserbase configuration plus the process values required to launch Node. The host's model credential remains in the Mastra process.

<Warning>
  `run` executes model-authored JavaScript in the browser. Use Browserbase for untrusted tasks and review the [integration security boundary](/v4/integrations/overview#security-boundary).
</Warning>

<Card title="Mastra integration source" icon="github" href="https://github.com/browserbase/stagehand/tree/main/packages/integrations/mastra">
  Read the MCP client setup, agent prompt, and contract tests.
</Card>