Perf MCP Server: Install & Setup

Install Perf in Claude Code

Claude Code

claude mcp add perf -e PERF_API_KEY=... -- npx -y perf-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "perf": {
      "command": "npx",
      "args": [
        "-y",
        "perf-mcp"
      ],
      "env": {
        "PERF_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Perf MCP server do?

Fact-check and fix AI outputs. Hallucination detection, schema validation, auto-repair.

Is the Perf MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Perf run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Perf to Claude Code?

Run: claude mcp add perf -e PERF_API_KEY=... -- npx -y perf-mcp

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