What is the key difference between MCP Registry Server and OnlyHarness Registry?

MCP Registry Server belongs to the Developer Tools category with cloud HTTP/SSE execution, while OnlyHarness Registry belongs to the Developer Tools category with local stdio execution.

How do I install MCP Registry Server or OnlyHarness Registry in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are MCP Registry Server and OnlyHarness Registry free or paid?

MCP Registry Server operates under a Free / Open Source model (No auth required). OnlyHarness Registry operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

MCP Registry Server lists 0 tools with 0 views and 7,133 GitHub stars. OnlyHarness Registry lists 0 tools with 0 views and 0 GitHub stars.

Can I use both MCP Registry Server and OnlyHarness Registry together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

How do I install MCP Registry Server or OnlyHarness Registry in Claude Desktop, Cursor, or Windsurf?

Both servers follow the standard Model Context Protocol configuration format. Simply copy the JSON block from the configuration section above and paste it into your AI client's mcpServers configuration object (for instance in claude_desktop_config.json or ~/.cursor/mcp.json ), then completely restart or refresh the application.

Are MCP Registry Server and OnlyHarness Registry free to use, or do they require API keys?

MCP Registry Server is listed under a Free / Open Source model with No auth required . OnlyHarness Registry operates under a Free / Open Source model with No auth required . If environment variables are required (such as API keys), be sure to define them under the env key in your MCP client's configuration file.

Can I run both MCP Registry Server and OnlyHarness Registry at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both mcp-registry-server and onlyharness-registry as distinct keys inside the single mcpServers object in your configuration file. Your AI assistant will automatically select and call the appropriate tool from either server during chat sessions.

Which MCP server has higher directory engagement and quality ratings?

On AllMCPs, MCP Registry Server has a Quality Score of 48 /100 ( Fair ) with 0 views, 0 installs, and 7,133 GitHub stars. OnlyHarness Registry holds a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

MCP Registry Server vs OnlyHarness Registry

In-depth architectural comparison of the MCP Registry Server 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.

At a Glance & Executive Verdict

MCP Registry Server

Developer Tools · Remote HTTP/SSE

Quality: 48/100 (Fair) | Auth: No auth required

OnlyHarness Registry

Developer Tools · Local stdio

Quality: 27/100 (Emerging) | Auth: No auth required

Verdict Summary: Choose MCP Registry Server if you need specialized Developer Tools tools running via a hosted cloud SSE transport. Choose OnlyHarness Registry if your workspace requires Developer Tools integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose MCP Registry Server when:

You need dedicated capabilities in the Developer Tools domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: No auth required (Free / Open Source).

Explore MCP Registry Server 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	M MCP Registry Server Developer Tools	O OnlyHarness Registry Developer Tools
Summary	Publish and discover MCP servers via the official MCP Registry. Powered by HAPI MCP server.	Search, inspect, pull and publish reusable AI-agent harnesses from onlyharness.com.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

MCP Registry Server Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

OnlyHarness Registry Tools (0)

No explicit tool names declared in metadata yet. Check project README on main listing page.

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).

MCP Registry Server Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "mcp-registry-server": {
      "url": "https://registry.modelcontextprotocol.io/docs"
    }
  }
}

OnlyHarness Registry Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

MCP Registry Server is categorized under Developer Tools and uses a remote streaming HTTP/SSE transport. In contrast, OnlyHarness Registry belongs to Developer Tools using local stdio subprocess. Select MCP Registry Server when you need capabilities focused on developer tools and OnlyHarness Registry when you require tools for developer tools.

More alternatives to MCP Registry Server More alternatives to OnlyHarness Registry Developer Tools category hub