Modal MCP Server

An MCP server implementation for interacting with Modal volumes and deploying Modal applications from within Cursor.

Installation

Clone this repository:

git clone https://github.com/smehmood/modal-mcp-server.git
cd modal-mcp-server

Install dependencies using uv:

uv sync

Configuration

To use this MCP server in Cursor, add the following configuration to your ~/.cursor/mcp.json:

{
  "mcpServers": {
    "modal-mcp-server": {
      "command": "uv",
      "args": [
        "--project", "/path/to/modal-mcp-server",
        "run", "/path/to/modal-mcp-server/src/modal_mcp/server.py"
      ]
    }
  }
}

Replace /path/to/modal-mcp-server with the absolute path to your cloned repository.

Requirements

Python 3.11 or higher
uv package manager
Modal CLI configured with valid credentials
For Modal deploy support:
- Project being deployed must use uv for dependency management
- Modal must be installed in the project's virtual environment

Supported Tools

List Modal Volumes (list_modal_volumes)
- Lists all Modal volumes in your environment
- Returns JSON-formatted volume information
- Parameters: None
List Volume Contents (list_modal_volume_contents)
- Lists files and directories in a Modal volume
- Parameters:
  - volume_name: Name of the Modal volume
  - path: Path within volume (default: "/")
Copy Files (copy_modal_volume_files)
- Copies files within a Modal volume
- Parameters:
  - volume_name: Name of the Modal volume
  - paths: List of paths where last path is destination
- Example: ["source.txt", "dest.txt"] or ["file1.txt", "file2.txt", "dest_dir/"]
Remove Files (remove_modal_volume_file)
- Deletes a file or directory from a Modal volume
- Parameters:
  - volume_name: Name of the Modal volume
  - remote_path: Path to file/directory to delete
  - recursive: Boolean flag for recursive deletion (default: false)
Upload Files (put_modal_volume_file)
- Uploads a file or directory to a Modal volume
- Parameters:
  - volume_name: Name of the Modal volume
  - local_path: Path to local file/directory to upload
  - remote_path: Path in volume to upload to (default: "/")
  - force: Boolean flag to overwrite existing files (default: false)
Download Files (get_modal_volume_file)
- Downloads files from a Modal volume
- Parameters:
  - volume_name: Name of the Modal volume
  - remote_path: Path to file/directory in volume to download
  - local_destination: Local path to save downloaded files (default: current directory)
  - force: Boolean flag to overwrite existing files (default: false)
- Note: Use "-" as local_destination to write file contents to stdout

Deploy Modal App (deploy_modal_app)
- Deploys a Modal application
- Parameters:
  - absolute_path_to_app: Absolute path to the Modal application file
- Note: The project containing the Modal app must:
  - Use uv for dependency management
  - Have the modal CLI installed in its virtual environment

Response Format

All tools return responses in a standardized format, with slight variations depending on the operation type:

# JSON operations (list volumes, list contents):
{
    "success": True,
    "data": {...}  # JSON data from Modal CLI
}

# File operations (put, get, copy, remove):
{
    "success": True,
    "message": "Operation successful message",
    "command": "executed command string",
    "stdout": "command output",  # if any
    "stderr": "error output"     # if any
}

# Error case (all operations):
{
    "success": False,
    "error": "Error message describing what went wrong",
    "command": "executed command string",  # for file operations
    "stdout": "command output",  # if available
    "stderr": "error output"     # if available
}

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Integrations