MCP Protocol

Model Context Protocol reference

MCP Protocol

Metrifyr implements the Model Context Protocol (MCP) for connecting Claude to Google Marketing APIs.

What is MCP?

MCP is an open protocol that standardizes how AI assistants connect to data sources and tools.

Official spec: https://spec.modelcontextprotocol.io/

Metrifyr Implementation

Server:

• Published as @metrifyr/mcp-server on npm
• Implements MCP server spec v2024-11-05
• Supports stdio transport

Tools:

• 58 tools across 5 categories
• JSON schema validation
• Structured error responses

Resources:

• Memory system (per-API-key context)
• Usage analytics
• OAuth token management

Transport

Metrifyr uses stdio transport:

{
  "command": "npx",
  "args": ["-y", "@metrifyr/mcp-server@latest"],
  "env": {
    "METRIFYR_API_KEY": "your-key"
  }
}

Tool Schema Example

{
  "name": "ga4_run_report",
  "description": "Run a GA4 report",
  "inputSchema": {
    "type": "object",
    "properties": {
      "propertyId": { "type": "string" },
      "metrics": { "type": "array" },
      "dimensions": { "type": "array" }
    },
    "required": ["propertyId", "metrics"]
  }
}

Next Steps