MCP Seatbelt vs Secret Safe Env

In-depth architectural comparison of the MCP Seatbelt and Secret Safe Env 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 MCP Seatbelt 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 MCP Seatbelt Details

Choose Secret Safe Env 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 Secret Safe Env Details

Feature & Specification Comparison

Specification	MCP Seatbelt Security	Secret Safe Env Security
Summary	MCP runtime security proxy. Blocks dangerous AI agent tool calls with a policy engine.	Write secrets into .env without the agent ever seeing the value - Windows masked dialog (繁中 UI)
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": {
    "mcp-seatbelt": {
      "command": "npx",
      "args": [
        "-y",
        "@kryptosai/mcp-seatbelt"
      ]
    }
  }
}

{
  "mcpServers": {
    "secret-safe-env": {
      "command": "npx",
      "args": [
        "-y",
        "secret-safe-env"
      ]
    }
  }
}

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