METTLE MCP Server: Install & Setup

Install METTLE in Claude Code

Claude Code

claude mcp add mettle -- uvx mettle-verifier

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

{
  "mcpServers": {
    "mettle": {
      "command": "uvx",
      "args": [
        "mettle-verifier"
      ]
    }
  }
}

Experimental reverse CAPTCHA with signed badges and credentials. Not proof of identity or substrate.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

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

Run: claude mcp add mettle -- uvx mettle-verifier

CSOAI-ORG/mitre-atlas-mcp

MITRE ATLAS — Adversarial Threat Landscape for AI Systems. Tactics + techniques for attacking AI...

Serdnaley/metabase-mcp

Headless Metabase MCP: API-key auth, no OAuth. 178 tools, toolsets, stdio or HTTP, all tiers.

pipeworx-io/mcp-mozilla-observatory

MDN HTTP Observatory — grade any website's HTTP security headers and get the specific fixes, from…

mcplookupdev/mcplookup-mcp

Look up independent trust ratings and security, maintenance, and adoption evidence for MCP servers.

pipeworx-io/mcp-nationalize

Nationalize MCP — nationality prediction from first name (nationalize.io, free, no auth)

jeremyrx7/mcpgrade

Security grades (A-F) for MCP servers. Check one before you install or trust it. mcpgrade.dev