NestDaddy

YUSA

io.github.yusasecurity/yusa ยท v0.3.1

Prompt-injection firewall for AI agents: scan untrusted text, fence it, gate tool calls.

Connect Runs on your machine

Terminal
claude mcp add yusa -e YUSA_POLICY=<YUSA_POLICY> -- https://github.com/yusasecurity/yusa/releases/download/v0.3.1/yusa.mcpb
claude_desktop_config.json
{
  "mcpServers": {
    "yusa": {
      "command": "https://github.com/yusasecurity/yusa/releases/download/v0.3.1/yusa.mcpb",
      "args": [],
      "env": {
        "YUSA_POLICY": "<YUSA_POLICY>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "yusa": {
      "command": "https://github.com/yusasecurity/yusa/releases/download/v0.3.1/yusa.mcpb",
      "args": [],
      "env": {
        "YUSA_POLICY": "<YUSA_POLICY>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "yusa": {
      "type": "stdio",
      "command": "https://github.com/yusasecurity/yusa/releases/download/v0.3.1/yusa.mcpb",
      "args": [],
      "env": {
        "YUSA_POLICY": "<YUSA_POLICY>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
YUSA_POLICY
Optional
Optional path to a policy JSON (allowTools, allowAddresses, allowHosts, maxValueEth) for yusa_check_tool_call.

Details

Packagehttps://github.com/yusasecurity/yusa/releases/download/v0.3.1/yusa.mcpb (MCPB, stdio)
First published13 Nov 2026
Last updated13 Nov 2026
Registry nameio.github.yusasecurity/yusa

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