The main difference in using skills and MCP servers are that MCP servers that are loaded when used are attached to every prompt you send to your AI. This is true no matter what you are using to program with. This uses Tokens!!! Skills are only attached to your prompt when they are used and the AI only loads them when it is needed. This saves Tokens!!! The nice thing with Antigravity 2 is there is a toggle next to each MCP Server to load or not load it. Which means you can setup many MCP Servers and turn them off and on without playing with JSON Code. (see images)