Collaborating With Antigravity is an agent skill from appautomaton/agent-designer. Delegate tasks to Google's Antigravity CLI (agy) for prototyping, debugging, code review, and research. Supports multi-turn sessions via SESSIONID. Successor to the retired Gemini CLI.
Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including scripts, reference files and assets (for example `assets/prompt-template.md`, `references/agy-cli.md` and `references/shell-quoting.md`).
It sits in Development, covering Prototyping. The repository describes itself as: Portable SKILLs workspace for Claude Code, Codex, and Gemini — issue-driven workflows and cross-agent collaboration via bridge scripts with session continuity.