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Connect Simma to Antigravity

September 8, 2026·Simma
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Connect Simma to Antigravity

Antigravity is Google's agent-first development environment, powered by Gemini. It is an IDE, not a chat app, so this guide is for the athlete or coach who already lives in one — if you write code and want Gemini to know your training, this is the way in. If you don't, Claude is the easier home.

It's the one Gemini-powered surface an individual can connect today. Gemini's consumer apps have no way to add a custom server, and Gemini Enterprise needs a team admin; Antigravity needs neither. It's free in public preview.

What you need

The URL

https://mcp.getsimma.com/mcp

Step by step

  1. Open Antigravity's MCP settings. In the agent panel, look for MCP servers (the exact route through the menus moves between preview builds; searching the settings for "MCP" finds it).

  2. Add a remote server and paste the URL above. Antigravity calls this the server URL; if it hands you a configuration file instead, the entry looks like this:

    {
  "mcpServers": {
    "simma": {
      "serverUrl": "https://mcp.getsimma.com/mcp"
    }
  }
}

  3. Sign in when prompted. Antigravity opens Simma's sign-in page in your browser. Use the email and password you use for the Simma app. You never need a client ID or secret; Simma handles the registration on its side.

  4. Check the tool list. Once connected, Antigravity lists Simma's tools. A coach sees tools about their squad; an athlete sees tools about their own training.

Asking for things

Antigravity's agent picks tools by itself. Ask in plain words:

"How's my training going this month?"

"Which of my swims faded in the main set?"

"Draft this week's summary for Sarah." (coaches)

Permissions

Antigravity asks before running a tool by default. Simma marks the read-only tools as such, so you can allow those freely and keep the prompt on anything that writes. Sending a message is never silent: Simma shows you the full text and asks you directly before it goes.

Who can see what

Your conversation with Antigravity stays between you and Google. Simma sees requests for data, never the words around them. The only thing that reaches another person is a message you deliberately send.

Google processes your conversation under its own terms. And an athlete without a coach of their own is attached to Simma's house coach account, which can read their training data as any coach can — see the privacy policy.

If something doesn't work