Security Scorecard MCP Server

SSC MCP Server

A community-built, comprehensive Model Context Protocol (MCP) server for Claude Desktop that integrates with the SecurityScorecard API.

Published on npm as @callmarcus/securityscorecard-mcp and listed in the MCP Registry as io.github.CallMarcus/securityscorecard-mcp.

Disclaimer: This is an independent, community-built open-source project. It is not affiliated with, endorsed by, sponsored by, or associated with SecurityScorecard, Inc. in any way. It is built solely against SecurityScorecard's publicly available API documentation. "SecurityScorecard" and all related names, marks, and logos are trademarks of SecurityScorecard, Inc. and are used here for identification purposes only. You must supply your own API credentials and comply with SecurityScorecard's terms of service.

Quick Start

Prerequisites

1. Node.js 18+ - Download
2. SecurityScorecard API Token - Get from your SecurityScorecard dashboard

Option A — Install from npm (recommended)

No clone or build required. Point Claude Desktop at the published package with npx.

Edit your claude_desktop_config.json:

• Windows: %APPDATA%\Claude\claude_desktop_config.json
• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "security-scorecard": {
      "command": "npx",
      "args": ["-y", "@callmarcus/securityscorecard-mcp"],
      "env": {
        "SECURITY_SCORECARD_API_TOKEN": "your-api-token-here",
        "COMPANY_DOMAIN": "example.com"
      }
    }
  }
}

npx -y fetches and runs the latest published version automatically. Replace the credentials with your own, then restart Claude Desktop.

Option B — Run from source (for development)

# Clone the repository
git clone https://github.com/CallMarcus/security-scorecard-mcp.git
cd security-scorecard-mcp

# Install dependencies
npm install

# Build (use build:fast to avoid memory issues)
npm run build:fast

Then point Claude Desktop at your local build:

{
  "mcpServers": {
    "security-scorecard": {
      "command": "node",
      "args": ["/path/to/security-scorecard-mcp/build/index.js"],
      "env": {
        "SECURITY_SCORECARD_API_TOKEN": "your-api-token-here",
        "COMPANY_DOMAIN": "example.com"
      }
    }
  }
}

Important: Replace the path and credentials with your actual values, then restart Claude Desktop.

Available Tools

The server (index.js) provides 9 specialized tools optimized for Claude Desktop:

Response Modes

Each tool supports three response modes for token efficiency:

• minimal - Quick answers (15-50 tokens)
• standard - Overview with context (200-300 tokens)
• detailed - Comprehensive analysis (800+ tokens)

Environment Variables

Optional rate limiting and caching:

REQUEST_CACHE_TTL_MS=300000
REQUESTS_PER_INTERVAL=5
REQUEST_INTERVAL_MS=1000

API Discovery

The server includes hybrid search (semantic + keyword) for finding SecurityScorecard API endpoints:

Use api_discovery to search for "email security"

This searches 628 indexed endpoints and returns matching paths with confidence scores, required parameters, and curl examples.

To update the API reference after changes:

npm run api:embed    # Regenerate semantic embeddings
npm run api:update   # Regenerate docs + embeddings

Development

Build Commands

npm run build:fast   # Recommended - uses esbuild (~130ms)
npm run build        # TypeScript compiler (may OOM on some systems)
npm test             # Run tests

Project Structure

src/
  index.ts               # MCP server (9 tools)
  api/client.ts          # SecurityScorecard API client
  integration/           # API discovery system
docs/api/                # Self-contained API reference
  index.jsonl            # Endpoint index (628 endpoints)
  index-embeddings.json  # Semantic search embeddings
build/                   # Compiled JavaScript

Testing

npm test             # Run test suite

Troubleshooting

Build fails with out of memory

Use the fast build instead:

npm run build:fast

"Cannot find module" errors

Reinstall dependencies:

rm -rf node_modules
npm install
npm run build:fast

Claude Desktop doesn't see the MCP

1. Check the config path: %APPDATA%\Claude\claude_desktop_config.json
2. Verify the path to index.js is correct
3. Restart Claude Desktop completely

API returns 401 Unauthorized

Your API token is invalid or expired. Get a new one from SecurityScorecard dashboard.

License

MIT

Links

• SecurityScorecard API Docs
• Model Context Protocol
• Report Issues