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Guild’s runtime can drive agent turns with Google’s Antigravity coding engine. The Antigravity driver runs alongside the Claude, Codex, and opencode drivers, so the runtime can execute any of these engines in the same environment. This page describes how the runtime executes Antigravity. You do not set these values yourself — the runtime manages them for every turn.

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Execution environment

The driver runs the Antigravity coding harness through its Python software development kit (SDK) rather than as a command-line subprocess. The runtime container provisions the environment variables and state directories Antigravity needs, so resumed turns reuse persistent session state within the same runtime container.

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Running a turn

The driver routes the turn to Gemini and authenticates with a Gemini API key, so Antigravity executes on your Gemini keys. It registers the runtime’s tools with the harness, so the engine can call them while it works through the turn.