MCP Doctor

Check and improve the contract quality of any MCP server — for humans, agents, and platforms.

Problem

Most MCP servers are built with only one audience in mind (usually human developers reading a README). But a successful MCP server needs to satisfy three audiences simultaneously:

• Distribution platforms (Registry, Smithery, PulseMCP, Glama) need structured metadata
• Human users need clear purpose, trust signals, and low install friction
• AI agents need unambiguous tool descriptions, declared side effects, and token-efficient responses

MCP Doctor checks all six dimensions of "contract quality" and gives you actionable recommendations.

Quick Start

pip install mcp-doctor
mcp-doctor check /path/to/your-mcp-server

What It Checks

Usage

CLI

# Terminal output (default)
mcp-doctor check /path/to/server

# JSON output (for CI/CD)
mcp-doctor check /path/to/server --format json

# Markdown output (for README badges or reports)
mcp-doctor check /path/to/server --format markdown

As an MCP Server

MCP Doctor is also an MCP server, so AI agents can use it to check other servers:

{
  "mcpServers": {
    "mcp-doctor": {
      "command": "python",
      "args": ["-m", "mcp_doctor.mcp_server"]
    }
  }
}

Tools:

• check_server(path, format) — Run all 6 checks on a server at the given path
• list_dimensions() — List what MCP Doctor evaluates

Scoring

Each dimension is scored 0-100 and graded A/B/C/D:

• A (90+): Exemplary
• B (75-89): Good, minor gaps
• C (55-74): Adequate, notable gaps
• D (<55): Needs significant improvement

Theoretical Foundation

MCP Doctor is based on the Contract Quality Framework — the principle that a successful MCP product's promises (what it does, what it costs, what risks it carries) should be equally parseable by platforms, humans, and agents.

The framework draws from:

• Anthropic's "Writing effective tools for agents" (tool description engineering, namespacing, token efficiency)
• Official MCP Registry requirements (server.json schema, namespace verification)
• Cross-platform analysis of Smithery, PulseMCP, Glama ranking signals

License

MIT