What is the key difference between Shield and Rubric Protocol?

Shield belongs to the Security category with local stdio execution, while Rubric Protocol belongs to the Security category with local stdio execution.

How do I install Shield or Rubric Protocol 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 Shield and Rubric Protocol free or paid?

Shield operates under a Free / Open Source model (No auth required). Rubric Protocol operates under a Free / Open Source model (No auth required).

Which MCP server has more tools and community activity?

Shield lists 6 tools with 3 views and 6 GitHub stars. Rubric Protocol lists 0 tools with 0 views and 0 GitHub stars.

Can I use both Shield and Rubric Protocol 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 Shield or Rubric Protocol 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 Shield and Rubric Protocol free to use, or do they require API keys?

Shield is listed under a Free / Open Source model with No auth required . Rubric Protocol 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 Shield and Rubric Protocol at the same time in my AI client?

Yes! MCP clients support multi-server orchestration. You can include both aperionai-shield and rubric-protocol 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, Shield has a Quality Score of 61 /100 ( Good ) with 3 views, 0 installs, and 6 GitHub stars. Rubric Protocol holds a Quality Score of 27 /100 ( Emerging ) with 0 views, 0 installs, and 0 GitHub stars.

Side-by-Side Model Context Protocol Comparison

Shield vs Rubric Protocol

In-depth architectural comparison of the Shield and Rubric Protocol 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

Shield

Security · Local stdio

Quality: 61/100 (Good) | Auth: No auth required

Rubric Protocol

Security · Local stdio

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

Verdict Summary: Choose Shield if you need specialized Security tools running via a local process. Choose Rubric Protocol if your workspace requires Security integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Shield when:

You need dedicated capabilities in the Security domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: SHIELD_CLOAK_VALUE.
Primary tools included: Intercepts and blocks destructive tool calls with 65+ adaptive rules, Supports local stdio and remote Streamable HTTP MCP servers, TOFU pinning of tool catalogs to prevent supply-chain attacks.

Explore Shield Details

Choose Rubric Protocol when:

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

Explore Rubric Protocol Details

Feature & Specification Comparison

Specification	Shield AperionAI Security	R Rubric Protocol Security
Summary	Local guardrail proxy for AI coding agents. Wraps any MCP server (stdio or Streamable HTTP) and blocks destructive tool calls — DROP TABLE, rm -rf, force-push — before they execute. MCP supply-chain protection: TOFU tool-catalog pinning against rug pulls, plus tool-description and tool-result scanning for tool poisoning and prompt injection. 51 starter rules, approval gates, audit logging. Single binary, Apache-2.0.	AI compliance attestation for EU AI Act, SR 11-7, HIPAA. Free local tier, no key required.
Category & Scope	Security

Tools & Capabilities Breakdown

Shield Tools (6)

Intercepts and blocks destructive tool calls with 65+ adaptive rules

Supports local stdio and remote Streamable HTTP MCP servers

TOFU pinning of tool catalogs to prevent supply-chain attacks

Audit logging and approval gates with optional biometric verification

Reversible secret cloaking to hide credentials from model context

Pre-install MCP server scanning and OS-level sandbox confinement

Rubric Protocol Tools (0)

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).

Shield Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "aperionai-shield": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-postgres"
      ],
      "env": {
        "SHIELD_CLOAK_VALUE": "YOUR_SHIELD_CLOAK_VALUE_HERE"
      }
    }
  }
}

Rubric Protocol Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

Shield is categorized under Security and uses a local stdio subprocess. In contrast, Rubric Protocol belongs to Security using local stdio subprocess. Select Shield when you need capabilities focused on security and Rubric Protocol when you require tools for security.

More alternatives to Shield More alternatives to Rubric Protocol Security category hub