PowerShell MCP Server

A Model Context Protocol server for interacting with PowerShell. This server provides tools for executing PowerShell commands, retrieving system information, managing modules, and more.

Requirements

• Node.js 18+
• PowerShell 5.1 or PowerShell Core 7+

Installation

1. Install dependencies:

   npm install

2. Build the project:

   npm run build

Configuration

For Claude Desktop

Edit config: $HOME/Library/Application\ Support/Claude/claude_desktop_config.json

Add to mcpServers:

{
  "mcpServers": {
    "mcp-powershell": {
      "command": "node",
      "args": [
        "/absolute/path/to/mcp-powershell/dist/index.js"
      ]
    }
  }
}

For VS Code

Edit config: $HOME/Library/Application\ Support/Code/User/settings.json

Add to settings:

"mcp": {
  "servers": {
    "mcp-powershell": {
      "command": "node",
      "args": [
        "/absolute/path/to/mcp-powershell/dist/index.js"
      ]
    }
  }
}

For Cursor IDE

Edit config: $HOME/.cursor/mcp.json

Add to mcpServers:

{
  "mcpServers": {
    "mcp-powershell": {
      "command": "node",
      "args": [
        "/absolute/path/to/mcp-powershell/dist/index.js"
      ]
    }
  }
}

Available Tools

This PowerShell MCP server provides the following tools:

execute_ps

Execute a PowerShell command and get the result.

Parameters:
- command (string): PowerShell command to execute

Example usage:

execute_ps(command: "Get-Process | Select-Object -First 5")

get_system_info

Retrieve detailed system information, including OS details, processor, memory, and PowerShell version.

Parameters: None

Example usage:

get_system_info()

list_modules

List all installed PowerShell modules with details like name, version, and type.

Parameters: None

Example usage:

list_modules()

get_command_help

Get detailed help for a specific PowerShell command, including syntax, parameters, and examples.

Parameters:
- command (string): PowerShell command to get help for

Example usage:

get_command_help(command: "Get-Process")

find_commands

Search for PowerShell commands by name or pattern.

Parameters:
- search (string): Search term for PowerShell commands

Example usage:

find_commands(search: "Process")

run_script

Run a PowerShell script file with optional parameters.

Parameters:
- scriptPath (string): Path to the PowerShell script file
- parameters (string, optional): Optional parameters to pass to the script

Example usage:

run_script(scriptPath: "/path/to/script.ps1", parameters: "-Name 'Test' -Value 123")

Development

To run in development mode:

npm run dev

Extending the Server

To add your own PowerShell tools:

1. Edit src/index.ts
2. Add new tools in the registerTools() method
3. Follow the existing pattern for consistent error handling
4. Build with npm run build

Adding a Tool Example

// In the registerTools() method:
this.server.tool(
  "my_ps_tool",
  {
    param1: z.string().describe("Description of parameter 1"),
    param2: z.number().optional().describe("Optional numeric parameter"),
  },
  async ({ param1, param2 }) => {
    try {
      // Your PowerShell command
      const command = `Your-PowerShell-Command -Param1 "${param1}" ${param2 ? `-Param2 ${param2}` : ''}`;

      const { stdout, stderr } = await execAsync(`powershell -Command "${command.replace(/"/g, '\\"')}"`);

      if (stderr) {
        return {
          isError: true,
          content: [
            {
              type: "text" as const,
              text: `Error in my_ps_tool: ${stderr}`,
            },
          ],
        };
      }

      return {
        content: [
          {
            type: "text" as const,
            text: stdout,
          },
        ],
      };
    } catch (error) {
      return {
        isError: true,
        content: [
          {
            type: "text" as const,
            text: `Error in my_ps_tool: ${(error as Error).message}`,
          },
        ],
      };
    }
  }
);

Security Considerations

• This server executes PowerShell commands directly on your system
• Commands are executed with the same privileges as the process running the MCP server
• Use caution when exposing destructive operations
• Consider implementing additional validation for sensitive commands

Troubleshooting

Common Issues

1. PowerShell execution policy restrictions

   • You may need to adjust your PowerShell execution policy to allow script execution
   • Use Set-ExecutionPolicy RemoteSigned -Scope CurrentUser to allow local scripts

2. Path not found errors

   • Ensure file paths are absolute or properly relative to the working directory
   • Use appropriate path separators for your OS

3. Command not found errors

   • Some commands may require specific modules to be installed
   • Use Install-Module ModuleName to install required modules

License

MIT