pict-mcp

PICT MCP Server

This project provides a server that exposes the Microsoft PICT (Pairwise Independent Combinatorial Testing) tool through the Model Context Protocol (MCP). It allows AI agents and other clients to programmatically generate combinatorial test cases.

Prerequisites

Before you begin, ensure you have the following installed:

• Node.js: Version 22.x or later.
• PICT: The command-line tool from Microsoft. You can download it from the official PICT GitHub repository. Make sure the pict executable is available in your system's PATH.
  • On macOS, you can install it easily using Homebrew: brew install pict

Installation

1. Clone the repository:

   git clone https://github.com/tpoeppke/pict-mcp.git
   cd pict-mcp
   

2. Install dependencies:

   npm install
   

Usage

To start the MCP server, run the following command:

npm start

The server will start on port 3000 by default and listen for MCP requests at the /mcp endpoint.

Tool: pict_generate

The server exposes a single tool, pict_generate, which generates a compact and effective set of test cases from a model.

Input Schema

The tool expects a JSON object with the following structure:

• parameters (Array<Object>, required): The parameters for the model.
  • name (string): The name of the parameter.
  • values (Array<string|number>): The possible values for the parameter.
• constraints (Array<string>, optional): A list of PICT-formatted constraint rules.
• options (Object, optional): PICT-specific options like order or caseSensitive.

Example Request

{
  "parameters": [
    {
      "name": "Type",
      "values": ["Single", "Span", "Stripe", "Mirror", "RAID-5"]
    },
    {
      "name": "Size",
      "values": [10, 100, 500, 1000, 5000, 10000, 40000]
    },
    {
      "name": "Format",
      "values": ["FAT", "FAT32", "NTFS"]
    }
  ],
  "constraints": [
    "IF [Type] = \"Stripe\" OR [Type] = \"RAID-5\" THEN [Size] > 1000;",
    "IF [Type] = \"Mirror\" THEN [Format] = \"NTFS\";"
  ]
}

Output Schema

The tool returns a JSON object containing the generated test cases.

Example Response

{
  "testCases": [
    {
      "Type": "Single",
      "Size": 10,
      "Format": "FAT"
    },
    {
      "Type": "Span",
      "Size": 100,
      "Format": "FAT32"
    },
    {
      "Type": "Stripe",
      "Size": 5000,
      "Format": "NTFS"
    }
  ]
}

Development

This project includes scripts to help with development:

• Run tests:

  npm test
  

• Check for linting errors:

  npm run lint
  

• Format code:

  npm run format
  

License

This project is licensed under the Apache License 2.0.