What is the key difference between Bloomfilter and OnlyHarness Registry?

Bloomfilter belongs to the Developer Tools category with local stdio execution, while OnlyHarness Registry belongs to the Developer Tools category with local stdio execution.

How do I install Bloomfilter 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 Bloomfilter and OnlyHarness Registry free or paid?

Bloomfilter 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?

Bloomfilter lists 10 tools with 0 views and 9 GitHub stars. OnlyHarness Registry lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Bloomfilter 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 Bloomfilter 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 Bloomfilter and OnlyHarness Registry free to use, or do they require API keys?

Bloomfilter 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 Bloomfilter and OnlyHarness Registry at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both bloomfilter 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, Bloomfilter has a Quality Score of 53 /100 ( Good ) with 0 views, 0 installs, and 9 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

Bloomfilter vs OnlyHarness Registry

In-depth architectural comparison of the Bloomfilter 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

Bloomfilter

Developer Tools · Local stdio

Quality: 53/100 (Good) | Auth: No auth required

OnlyHarness Registry

Developer Tools · Local stdio

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

Verdict Summary: Choose Bloomfilter if you need specialized Developer Tools tools running via a local process. 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 Bloomfilter 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).
Primary tools included: search_domains, get_pricing, get_domain_info.

Explore Bloomfilter 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	B Bloomfilter Developer Tools	O OnlyHarness Registry Developer Tools
Summary	Service that lets AI Agents search, register, and configure domains	Search, inspect, pull and publish reusable AI-agent harnesses from onlyharness.com.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Bloomfilter Tools (10)

search_domains

get_pricing

get_domain_info

register_domain

renew_domain

get_account

list_dns_records

add_dns_record

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).

Bloomfilter Configuration

mcpServers (Claude Desktop / Cursor)

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

OnlyHarness Registry Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

Bloomfilter is categorized under Developer Tools and uses a local stdio subprocess. In contrast, OnlyHarness Registry belongs to Developer Tools using local stdio subprocess. Select Bloomfilter when you need capabilities focused on developer tools and OnlyHarness Registry when you require tools for developer tools.

More alternatives to Bloomfilter More alternatives to OnlyHarness Registry Developer Tools category hub