Antigravity has no marketplace plugin format, but it auto-discovers a project-local skill. Adding it gives the agent Visily usage rules and prompting guidance.
Before you start
The Visily MCP works only on workspaces on a Pro or Business plan, where you are the workspace creator or have an editor license. Free workspaces and viewer/guest roles are not supported.
Add the skill
Copy the .agents/ folder from plugins/antigravity/ (in the repo) into your project root. Antigravity discovers the skill automatically at:
.agents/skills/visily/SKILL.md
That's it - no registration step. The skill activates on Visily URLs and find/build/theme intents.
You need both the MCP server, which provides the tools, and the skill that tells the agent how to use them well.