MCP Reference Servers

MCP Reference Servers Skill

When to Use

• When building new MCP servers and needing a reference implementation.
• When the user wants robust, community-tested servers for common tools (Filesystem, Google Search, Fetch, etc.).
• When debugging MCP connection issues using standardized servers.

Reference

MCP Reference Servers GitHub

Instructions

1. Identify Target Server

• Review the src directory in the reference repository to see available servers.
• Common servers include:
• fetch: For web page scraping.
• filesystem: For local file access.
• google-search: For web searching capabilities.
• postgres: For database interaction.

2. Implementation & Setup

• Most reference servers are built with Node.js/TypeScript or Python.
• Follow the README.md within each sub-directory for build and run instructions.
• Ensure the appropriate runtime (Node.js 18+ or Python 3.10+) is installed.

3. Usage via MCP Configuration

{
  "mcpServers": {
    "server-name": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-name"],
      "env": {
        "ENV_VAR": "value"
      }
    }
  }
}

Quality Gates

• Use npx for quick access without local installation unless performance is a concern.
• Keep environment variables secure in protected configuration files.
• Verify the server's capabilities via list_tools command after initialization.