ONCE — Exactly-Once Reliability for AI Agent Actions for Gemini CLI

io.github.gsterlingpress/once

Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.

client:Gemini CLI transport:streamable-http

Install ONCE — Exactly-Once Reliability for AI Agent Actions in Gemini CLI

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

{
  "mcpServers": {
    "once": {
      "httpUrl": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

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