Antigravity Skills: Teach Gemini Agents Domain Expertise
Summary
Mount SKILL.md and AGENTS.md into the Antigravity managed agent and save it as a reusable Gemini agent.
Google rolled out Managed Agents in the Gemini API on May 19, 2026 at I/O. The Antigravity agent ID antigravity-preview-05-2026 is the same harness that powers the Antigravity IDE, exposed as a single REST call that spins up a Linux sandbox, runs the agent loop, and returns the result.
The part that is genuinely new and worth learning right now is how you shape that agent. The Antigravity team adopted a filesystem-native customization model: drop an AGENTS.md and one or more SKILL.md files into .agents/ inside the sandbox, and the runtime auto-discovers them. Same convention Anthropic uses for Claude Skills, same convention Cursor and Codex use for AGENTS.md. The pattern is converging across vendors, and Antigravity is the freshest implementation.
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