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Gemini CLI

Postio — UK Address, Postcode, Email & Phone Validation for Gemini CLI

uk.co.postio/postcode-address-validation

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

client:Gemini CLI transport:stdio runtime:npm

Install Postio — UK Address, Postcode, Email & Phone Validation in Gemini CLI

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

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "postcode-address-validation": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<POSTIO_BASE_URL>"
      }
    }
  }
}

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

Postio — UK Address, Postcode, Email & Phone Validation in other clients

Postio — UK Address, Postcode, Email & Phone Validation MCP server