copy_modal_volume_files
Copy files within a Modal volume, moving source files to a destination file or directory for file management in serverless cloud environments.
Instructions
Copy files within a Modal volume. Can copy a source file to a destination file
or multiple source files to a destination directory.
Args:
volume_name: Name of the Modal volume to perform copy operation in.
paths: List of paths for the copy operation. The last path is the destination,
all others are sources. For example: ["source1.txt", "source2.txt", "dest_dir/"]
Returns:
A dictionary containing the result of the copy operation.
Raises:
Exception: If the copy operation fails for any reason.Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| volume_name | Yes | ||
| paths | Yes |
Implementation Reference
- src/modal_mcp/server.py:135-178 (handler)The handler function for the 'copy_modal_volume_files' tool, decorated with @mcp.tool() for registration. It validates input, runs 'modal volume cp' via run_modal_command helper, and formats the response.
@mcp.tool() async def copy_modal_volume_files(volume_name: str, paths: List[str]) -> dict[str, Any]: """ Copy files within a Modal volume. Can copy a source file to a destination file or multiple source files to a destination directory. Args: volume_name: Name of the Modal volume to perform copy operation in. paths: List of paths for the copy operation. The last path is the destination, all others are sources. For example: ["source1.txt", "source2.txt", "dest_dir/"] Returns: A dictionary containing the result of the copy operation. Raises: Exception: If the copy operation fails for any reason. """ if len(paths) < 2: return { "success": False, "error": "At least one source and one destination path are required" } try: result = run_modal_command(["modal", "volume", "cp", volume_name] + paths) response = { "success": result["success"], "command": result["command"] } if not result["success"]: response["error"] = f"Failed to copy files: {result.get('error', 'Unknown error')}" else: response["message"] = f"Successfully copied files in volume {volume_name}" if result.get("stdout"): response["stdout"] = result["stdout"] if result.get("stderr"): response["stderr"] = result["stderr"] return response except Exception as e: logger.error(f"Failed to copy files in Modal volume: {e}") raise - src/modal_mcp/server.py:15-41 (helper)Shared helper function that executes Modal CLI commands using subprocess and returns structured success/error results with stdout/stderr.
def run_modal_command(command: list[str], uv_directory: str = None) -> dict[str, Any]: """Run a Modal CLI command and return the result""" try: # uv_directory is necessary for modal deploy, since deploying the app requires the app to use the uv venv command = (["uv", "run", f"--directory={uv_directory}"] if uv_directory else []) + command logger.info(f"Running command: {' '.join(command)}") result = subprocess.run( command, capture_output=True, text=True, check=True ) return { "success": True, "stdout": result.stdout, "stderr": result.stderr, "command": ' '.join(command) } except subprocess.CalledProcessError as e: return { "success": False, "error": str(e), "stdout": e.stdout, "stderr": e.stderr, "command": ' '.join(command) }