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Google Antigravity (Agy) Integration

gstack supports Google Antigravity (Agy) as a first-class agent host. This integration allows you to generate and run Agy-compatible skills, load them dynamically via the agy plugin system, and benchmark agy models alongside Claude, OpenAI, and Gemini.

Features

Automatic Setup: Installs gstack skills directly into the Antigravity config directory via ./setup --host agy.
Agy Plugin Compatibility: Packages skills as a standard Agy plugin with a plugin.json manifest, automatically registered with agy plugin install.
Exclusion of Incompatible Skills: Automatically filters out Claude-specific wrappers (like gstack-codex) from Agy generation.
Benchmark Integration: Register Agy as a benchmark provider using agy --print to trace latency, quality, and tokens.

Setup & Installation

To generate and install gstack skills into your local Antigravity environment:

./setup --host agy

What Setup Does

Precompile & Prepare: Ensures the browse tool and other runtime dependencies are compiled.
Generate Skills: Runs bun run gen:skill-docs --host agy to generate Agy-compatible frontmatter.
Initialize Plugin: Creates the plugin directory structure under .gemini/config/plugins/gstack.
Symlink/Copy Assets: Places necessary executables (bin, browse, review, qa) into the plugin root.
Register Plugin: Invokes agy plugin install to import the gstack plugin into ~/.gemini/config/import_manifest.json.

Plugin Structure

When installed, the gstack plugin resides at: ~/.gemini/config/plugins/gstack/

The directory layout matches the standard Agy plugin structure:

~/.gemini/config/plugins/gstack/
├── plugin.json         # Manifest declaring name, version, and license
├── skills/             # Generated Agy-compatible skills
│   ├── gstack/         # Root gstack skill (/gstack)
│   ├── gstack-qa/      # QA testing skill (/qa)
│   └── ...
├── bin/                # Shared executables and CLI tools
└── browse/             # Browse tool distribution files

Benchmarking with Agy

Agy is registered as a model benchmark provider. You can execute prompts against Agy using the gstack benchmark runner.

Pre-requisites

The agy CLI must be installed and available in your PATH.
Credentials must be configured in ~/.gemini/oauth_creds.json.

Run Benchmark

To run a dry run and check availability:

gstack-model-benchmark --models agy --dry-run

To execute a benchmark run:

gstack-model-benchmark --models agy --prompt "Explain quantum computing in one sentence."

The runner automatically passes --dangerously-skip-permissions to the CLI to run headless without hanging on interactive permission prompts.

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