Formio MCP vs OnlyHarness Registry

In-depth architectural comparison of the Formio MCP and OnlyHarness Registry MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Formio MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Formio MCP Details

Choose OnlyHarness Registry when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore OnlyHarness Registry Details

Feature & Specification Comparison

Specification	Formio MCP Developer Tools	OnlyHarness Registry Developer Tools
Summary	Create and manage Form.io forms, resources, actions, roles, and projects from your AI agent.	Search, inspect, pull and publish reusable AI-agent harnesses from onlyharness.com.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "formio-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@formio/mcp@0.13.0"
      ]
    }
  }
}

{
  "mcpServers": {
    "onlyharness-registry": {
      "command": "npx",
      "args": [
        "-y",
        "onlyharness@latest"
      ]
    }
  }
}

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