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

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

How do I install MCP Registry Server or Unpaywall 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 Unpaywall free or paid?

MCP Registry Server operates under a Free / Open Source model (No auth required). Unpaywall 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. Unpaywall lists 0 tools with 0 views and 0 GitHub stars.

Can I use both MCP Registry Server and Unpaywall 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 Unpaywall 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 Unpaywall free to use, or do they require API keys?

MCP Registry Server is listed under a Free / Open Source model with No auth required . Unpaywall 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 Unpaywall at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both mcp-registry-server and unpaywall 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. Unpaywall 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 Unpaywall

In-depth architectural comparison of the MCP Registry Server and Unpaywall 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

Unpaywall

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 Unpaywall 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 Unpaywall 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 Unpaywall Details

Feature & Specification Comparison

Specification	M MCP Registry Server Developer Tools	U Unpaywall Developer Tools
Summary	Publish and discover MCP servers via the official MCP Registry. Powered by HAPI MCP server.	Open-access availability for 120M+ scholarly articles via the Unpaywall API
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.

Unpaywall 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"
    }
  }
}

Unpaywall Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

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

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