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Antigravity supports MCP servers via HTTP with OAuth. KonbiniAPI supports dynamic client registration, so no manual credentials are needed.
1

Open the MCP config

In Antigravity, click the ”…” dropdown at the top of the agent panel, select Manage MCP Servers, then click View raw config.This opens ~/.gemini/antigravity/mcp_config.json.
2

Add KonbiniAPI

{
  "mcpServers": {
    "konbiniapi": {
      "serverUrl": "https://mcp.konbiniapi.com"
    }
  }
}
3

Authorize

Open Agent Settings with Cmd+, (Mac) or Ctrl+, (Windows/Linux), navigate to the Customizations tab, and click Authenticate next to KonbiniAPI.Complete the login in your browser, copy the authorization code, paste it back into the settings panel, and click Submit.
Once authenticated, KonbiniAPI tools are available to Antigravity’s agent automatically. Access tokens are stored locally and refreshed automatically when they expire.