Pcrzero MCP vs Umbra Proof

In-depth architectural comparison of the Pcrzero MCP and Umbra Proof 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 Pcrzero 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 Pcrzero MCP Details

Choose Umbra Proof 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 Umbra Proof Details

Feature & Specification Comparison

Specification	Pcrzero MCP Developer Tools	Umbra Proof Developer Tools
Summary	Issue signed receipts for AI agent actions; verify any receipt offline - free, no account (stdio).	Verify Umbra bridge accountability proofs (signed receipts, checkpoints, Merkle inclusion).
Category & Scope	Developer Tools	Developer Tools
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": {
    "mcp-124": {
      "command": "npx",
      "args": [
        "-y",
        "@scytalex-llc/pcrzero-mcp"
      ]
    }
  }
}

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

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