MCP-Bastion for Gemini CLI

io.github.vaquarkhan/mcp-bastion

Security middleware for MCP. Blocks prompt injection, PII leakage, and resource exhaustion.

client:Gemini CLI transport:stdio runtime:pypi

Install MCP-Bastion in Gemini CLI

~/.gemini/settings.json · windows: %USERPROFILE%\.gemini\settings.json

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

Gemini expands $VAR and ${VAR} inside env values, so a secret can live in your shell rather than this file. Gemini CLI docs