Agent Callback Mailbox for Gemini CLI

us.inversolabs/agent-callback-mailbox

Paid replay-safe callback inboxes for asynchronous agent tasks with structured MCP results.

client:Gemini CLI transport:streamable-http

Install Agent Callback Mailbox in Gemini CLI

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

{
  "mcpServers": {
    "agent-callback-mailbox": {
      "httpUrl": "https://callbacks.inversolabs.us/mcp"
    }
  }
}

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