Get Started with Google Antigravity

This guide walks you through configuring the Uno Platform MCPs for Google Antigravity so you can use the agent with the Uno Dev Server.

Warning

Antigravity is currently a preview feature.

If changes (SDKs, templates, tools, MCPs) are not detected immediately, restarting the Antigravity agent, reopening the workspace, or re-running setup usually resolves the issue.

Check your environment

Open a command-line prompt, Windows Terminal if you have it installed, or else Command Prompt or Windows Powershell from the Start menu.
Setup uno.check by installing or updating the tool with:
```
dotnet tool update -g uno.check
```
Run the tool from the command prompt with the following command:
```
uno-check
```
You can optionally add the --target desktop --target web (or ios, android, windows) parameters based on your intended development platforms.
Follow the instructions indicated by the tool.

You can find additional information about uno-check here.

Open a Terminal.
Setup uno.check by installing or updating the tool with:
```
dotnet tool update -g uno.check
```
Run the tool from the command prompt with the following command:
```
uno-check
```
If the above command fails, use the following:
```
~/.dotnet/tools/uno-check
```
You can optionally add the --target desktop --target web (or ios, android, windows) parameters based on your intended target platforms.
Follow the instructions indicated by the tool

You can find additional information about uno-check here.

Open a Terminal
If dotnet --version returns command not found:
- Follow the official directions for installing .NET.
  
  Important
  
  If you are using Ubuntu 24.04 or earlier, use the Microsoft feed to install .NET. On later versions, you may install .NET directly from Ubuntu's official feed. In any case, you may refer to the directions from Microsoft on installing .NET on Ubuntu and make sure to select your Ubuntu version.
Then, setup uno.check by installing or updating the tool with:
```
dotnet tool update -g uno.check
```
Run the tool from the command prompt with the following command:
```
uno-check
```
If the above command fails, use the following:
```
~/.dotnet/tools/uno-check
```
You can optionally add the --target desktop --target web (or ios, android, windows) parameters based on your intended development platforms.
Follow the instructions indicated by the tool

You can find additional information about uno-check here.

Setting up Uno Platform MCPs

Note

The Uno Platform extension is not functional in Antigravity at this time.

Install Google Antigravity by following Google's official instructions for your operating system.
Configure Antigravity MCPs:

You can either use dnx -y uno.devserver mcp install gemini-antigravity to write the supported registration for you, or edit the raw config manually.

Example using the Dev Server CLI:
```
dnx -y uno.devserver mcp install gemini-antigravity
```
1. Open the MCP store via the "..." dropdown at the top of the editor's agent panel.
2. Click on "Manage MCP Servers"
3. Click on "View raw config"
4. Modify the mcp_config.json with your custom MCP server configuration:
```
{
    "mcpServers": {
        "uno": {
            "url": "https://mcp.platform.uno/v1"
        },
        "uno-app": {
            "command": "dotnet",
            "args": [
                "dnx",
                "-y",
                "uno.devserver",
                "--mcp-app",
                "--force-roots-fallback",
                "--mcp-wait-tools-list"
            ]
        }
    }
}
```
Note

--force-roots-fallback is optional. The DevServer auto-detects when the client does not advertise the MCP roots capability and exposes the uno_app_initialize tool automatically. The flag is still accepted for explicit override.

You can verify the registration state at any time:
```
dnx -y uno.devserver mcp status gemini-antigravity
```
To remove the Uno MCP entries from Antigravity's config:
```
dnx -y uno.devserver mcp uninstall gemini-antigravity
```
See The Uno Platform MCPs for additional details about MCP registration and diagnostics.

Next Steps

You are now ready to create your first app with Google Antigravity.