Output Firewall MCP Server: Install & Setup

Install Output Firewall in Claude Code

Claude Code

claude mcp add output-firewall -- npx -y mcp-output-firewall

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "output-firewall": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-output-firewall"
      ]
    }
  }
}

Three-layer firewall for MCP: content, egress and action policy. Proxy or server.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

Run: claude mcp add output-firewall -- npx -y mcp-output-firewall

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