Fetter MCP vs ProofFlow

In-depth architectural comparison of the Fetter MCP and ProofFlow 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.

Which MCP Server Should You Choose?

Choose Fetter MCP 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 Fetter MCP Details

Choose ProofFlow 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 ProofFlow Details

Feature & Specification Comparison

Specification	Fetter MCP Security	ProofFlow Security
Summary	Real-time Python package and vulnerability data for AI coding agents.	Audit infrastructure for AI coding agents with evidence-backed review and policy gates.
Category & Scope	Security	Security
Quality signal

Tools & Capabilities Breakdown

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).

{
  "mcpServers": {
    "fetter-mcp": {
      "command": "uvx",
      "args": [
        "fetter-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "proofflow": {
      "command": "uvx",
      "args": [
        "proofflow-mcp"
      ]
    }
  }
}

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