Lupa MCP Server

A standalone Model Context Protocol (MCP) server for the Lupa Testing Framework.

This server allows AI assistants (like Claude Desktop, Cursor, or Windsurf) to natively understand, run, and analyze your Lupa test suites. By exposing Lupa's programmatic execution API as standardized tools, your AI can automatically run tests, read structured JSON results, and help you fix failing specs.

Features

• Native AI Integration: Exposes lupa_run_tests and lupa_list_tests to any MCP-compliant client.

• Robust Sandboxing: Runs tests in ephemeral, isolated child processes. This guarantees zero memory leaks in long-running IDE sessions and prevents test output from corrupting the MCP JSON-RPC protocol.

• Dynamic Resolution: Automatically locates and uses the specific @pawel-up/lupa version installed in your target project.

Usage

You don't need to install this inside your project. Instead, configure your MCP client (IDE or AI assistant) to use npx to spawn the server globally.

Claude Desktop

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "lupa": {
      "command": "npx",
      "args": ["-y", "@pawel-up/lupa-mcp"]
    }
  }
}

Cursor / Windsurf

In your IDE settings for MCP Servers, add a new server:

• Type: command (or stdio)

• Command: npx -y @pawel-up/lupa-mcp

Once connected, simply ask your AI:

"Run my Lupa tests and tell me why they are failing."

Available Tools

The server provides the following tools to the AI:

lupa_run_tests

Executes Lupa tests and returns structured JSON results. The AI uses this to identify failing tests and read error stacks.

• Arguments:

  • configPath (required): Absolute path to the lupa.config.ts file in the target project.

  • files, suites, tags, tests (optional): Standard Lupa filters.

lupa_list_tests

Lists all available test files, suites, and tests without actually executing them. Useful for the AI to discover what tests exist in the project.

• Arguments: Same as lupa_run_tests.

Development

If you are developing or modifying the MCP server itself:

# Install dependencies
npm install

# Build the project
npm run build

# Run the server locally (using the compiled dist/index.js)
node dist/index.js