License Compliance MCP Server

license-compliance-mcp

MCP server that scans npm project dependencies for license compliance issues. Catch GPL contamination before code ships.

Tools

check-licenses

Scan a project's npm dependencies against a license policy and get a detailed compliance report.

Parameters:

• path (required) — Absolute path to the project root
• policy (optional, default: "permissive") — Policy preset or custom SPDX expression
  • "permissive" — Only MIT, ISC, BSD, Apache-2.0, etc.
  • "weak-copyleft" — Adds LGPL, MPL-2.0, EPL-2.0
  • "copyleft" — Adds GPL, AGPL
  • Custom: "(MIT OR Apache-2.0)" — Any valid SPDX expression

explain-license

Get a plain-language explanation of any SPDX license — permissions, conditions, limitations, compatibility, and gotchas.

Parameters:

• license (required) — SPDX identifier (e.g., "MIT", "GPL-3.0-only", "Apache-2.0")

Install

Claude Code

claude mcp add license-compliance -- npx -y license-compliance-mcp

Claude Desktop / Cursor

Add to your config (claude_desktop_config.json or .cursor/mcp.json):

{
  "mcpServers": {
    "license-compliance": {
      "command": "npx",
      "args": ["-y", "license-compliance-mcp"]
    }
  }
}

How It Works

1. Scans node_modules using license-checker-rseidelsohn
2. Normalizes license strings to valid SPDX using spdx-correct
3. Evaluates each package against the policy using spdx-satisfies
4. Traces dependency chains to show how problematic packages entered the project
5. Generates a markdown report grouped by severity (critical > warning > info)

Requirements

• Node.js >= 18
• Project must have node_modules installed (npm install)