MostLogin MCP

Written By Penny Wang

Last updated 14 days ago

MostLogin MCP Server is a local API service provided by MostLogin to connect with MCP-compatible AI tools. It enables seamless integration between MostLogin and popular AI development tools such as Claude, Cursor, Codex, and OpenCode.

MostLogin client version 2.1.9 and above is required for MCP.

Some prerequisites:

  1. Ensure your MostLogin client is updated to version 2.1.9 or higher.

  2. Keep MostLogin running in the background with the LocalAPI service enabled.

  3. Authorize local API

Once the local API is authorized, you can see the configuration options as below.

🛠️ Method 1: Configuration in the AI IDE UI (Taking Cursor as an Example)

Cursor supports direct configuration of SSE (Server-Sent Events) type MCP servers through its graphical interface.

  1. Open Cursor and navigate to settings:

  2. Select Features from the left-hand menu, then scroll down to the MCP section.

  3. Click + Add New MCP Server.

  4. Fill in the following details in the popup window:

    • Name: mostlogin

    • Type: Select SSE

    • URL: Enter the address shown in your app: [http://127.0.0.1:30898/mcp](http://127.0.0.1:30898/mcp)

  5. Add Request Headers (Headers):

    • Add a new Key-Value pair in the Headers section.

    • Key: Authorization

    • Value: Copy the full token string that follows Authorization from your MostLogin screen (the blurred part in the image).

  6. Click Save. If the connection is successful, Cursor will display a green indicator light next to the server.

💡 Connect method 2: Quick Configuration via Prompt

If the AI assistant you are using supports guided configuration through prompts:

  1. Click Copy prompt under the Configure MCP via prompt section in MostLogin.

  2. Paste the text directly into your AI Chat window (e.g., Claude 3.5 Sonnet or Cursor Chat).

  3. The AI will read the context instructions and automatically guide you through or complete the tool integration.

Once connected, you can use natural language commands to control MostLogin and perform the following key operations:

  • Create and launch browser profiles

  • Update browser fingerprints

  • Configure proxies

  • Manage sessions, cookies, User-Agent strings, and more

  • Execute other browser automation tasks

This integration significantly enhances AI-assisted development, testing, and automation workflows by allowing AI tools to interact with realistic browser environments just like a human user would.

Supported Tools

The MCP Server currently supports the following tools:

  • Claude (Claude Code) (Node.js is required)

  • Cursor

  • Codex (ChatGPT)

  • OpenCode

The General configuration applies to most tools. If you change values in the request headers, you will need to reconfigure the MCP based on the new values.

Common Use Cases & Example Commands

  • Create New Profile:
    “Create a new browser profile with Windows 10, latest Chrome, located in Los Angeles, using a SOCKS5 proxy.”

  • Update Fingerprint:
    “Modify the current profile’s Canvas and WebGL fingerprints to match a real device more closely.”

  • Batch Operations:
    “Create 10 different fingerprint profiles and assign unique proxies to each.”

  • Session Management:
    “Save cookies from the current browser session and restore them on next launch.”

Important Notes & Best Practices

  1. Network & Ports

    • Default port is 30897. Ensure your firewall allows traffic on this port.

    • Use the local address http://127.0.0.1:30897/mcp for security.

  2. Token Security

    • Keep your AUTH_TOKEN confidential.

    • Regenerate and update the token if it expires or becomes invalid.

  3. Compatibility

    • When switching AI tools (e.g., from Claude to Cursor), re-apply the configuration.

    • Reconfigure MCP whenever request headers change.

  4. Performance Tips

    • Initial connection may take a few seconds.

    • For large batch profile operations, process in smaller groups to avoid high resource usage.

  5. Troubleshooting

    • Connection Failed: Verify MostLogin is running, the port is not occupied, and the token is correct.

    • Commands Not Working: Ensure instructions explicitly mention “MostLogin” or “MCP” and clearly describe the desired action.

    • Proxy Issues: Confirm the proxy is working and specify the correct type (HTTP/SOCKS5) when creating profiles.

    • Check Logs: Use the MCP Server logs in the MostLogin interface for detailed diagnostics.