What is the key difference between Constraints Registry and Calm Mcp?

Constraints Registry belongs to the Developer Tools category with local stdio execution, while Calm Mcp belongs to the Developer Tools category with local stdio execution.

How do I install Constraints Registry or Calm Mcp 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 Constraints Registry and Calm Mcp free or paid?

Constraints Registry operates under a Free / Open Source model (No auth required). Calm Mcp operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Constraints Registry lists 0 tools with 0 views and 0 GitHub stars. Calm Mcp lists 0 tools with 1 views and 15 GitHub stars.

Can I use both Constraints Registry and Calm Mcp 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 Constraints Registry or Calm Mcp 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 Constraints Registry and Calm Mcp free to use, or do they require API keys?

Constraints Registry is listed under a Free / Open Source model with No auth required . Calm Mcp 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 Constraints Registry and Calm Mcp at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both constraints-registry and calm-mcp 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, Constraints Registry has a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars. Calm Mcp holds a Quality Score of 43 /100 ( Fair ) with 1 views, 0 installs, and 15 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Constraints Registry vs Calm Mcp

In-depth architectural comparison of the Constraints Registry and Calm Mcp 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

Constraints Registry

Developer Tools · Local stdio

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

Calm Mcp

Developer Tools · Local stdio

Quality: 43/100 (Fair) | Auth: No auth required

Verdict Summary: Choose Constraints Registry if you need specialized Developer Tools tools running via a local process. Choose Calm Mcp 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 Constraints 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 Constraints Registry Details

Choose Calm 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 Calm Mcp Details

Feature & Specification Comparison

Specification	C Constraints Registry Developer Tools	C Calm Mcp Developer Tools
Summary	Policy-as-code guardrails for AI coding agents, validated via OPA, Conftest, Checkov & Semgrep.	MCP server giving coding agents a call-graph-aware, hash-verified view of a codebase, not grep.
Category & Scope	Developer Tools	Developer Tools
Quality signal

Tools & Capabilities Breakdown

Constraints Registry Tools (0)

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

Calm Mcp 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).

Constraints Registry Configuration

mcpServers (Claude Desktop / Cursor)

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

Calm Mcp Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

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

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