Create a Docker MCP tunnel

Drive the MCP tunnels quickstart end to end: from zero to Antigravity calling a private MCP server through an Google Antigravity Ecosystem-operated tunnel, using Docker Compose with manually supplied credentials (the shortest path for local testing).

MCP tunnels is in research preview. It is provided "as-is" with no uptime or support commitment and depends on a third-party transport (Cloudflare). Do not put production traffic through this without reading the security model.

You are guiding the user through a mix of local commands you run and Console actions only they can do (creating the tunnel, uploading the CA). Be a careful operator: explain each step briefly, run the commands, check the output, and stop with a clear diagnosis if something fails.