Document working configuration to use Aperture and Gemini provider with antigravity-cli

[lorengordon]

I was able to get Aperture to work with the Gemini provider and the antigravity-cli:

1. Follow the Aperture docs to add Google Gemini as a model provider, https://tailscale.com/docs/aperture/how-to/use-google-gemini
2. Create the antigravity-cli settings.json file to set the modelProvider as gemini:

mkdir -p ~/.gemini/antigravity-cli && echo '{"modelProvider": "gemini"}' > ~/.gemini/antigravity-cli/settings.json

3. Export env to set a fake api key (Aperture will override)

export GEMINI_API_KEY="__aperture_key__"

4. Export env to set the base url to your Aperture endpoint

export GOOGLE_GEMINI_BASE_URL="..."

Fwiw: I have had no luck at all finding any client that will work with Aperture using the Google Enterprise Agent Platform (vertex) provider with Gemini models (not Anthropic)...

[lorengordon]

Related configuration that works through zed, after installing the antigravity-acp extension:

    "agent_servers": {
        "antigravity-acp": {
            "default_config_options": {
                "mode": "default",
                "model": "gemini-3.7-flash-high"
            },
            "type": "registry",
            "env": {
              "GEMINI_API_KEY": "__aperture_key__",
              "GOOGLE_GEMINI_BASE_URL": "http://ai"
            },
        }
    },

For VS Code, unfortunately, the official antigravity extension refuses to authenticate with an API key no matter what I try. It demands authentication using oauth, instead. Have had success using the Cline extension though, since it supports the Gemini API using an api key, and has an option to set a custom base URL.