Optimizing Gemini 3.5 Flash in Antigravity IDE

Optimizing Agentic Workflow and Structure

The author suggests bypassing the Antigravity 2.0 interface in favor of the Antigravity IDE to gain better control over extension support and agent behavior. To improve the performance of Gemini 3.5 Flash, which often struggles with UI generation and excessive planning, the author recommends implementing specific "skills" and prompt constraints.

To enforce structure and reduce unnecessary overhead, users should apply the "King Mode" prompt, which explicitly instructs the model to avoid creating new plans or overthinking tasks unless specifically requested. Additionally, integrating the "Karpathy skill" is recommended to further refine the agent's output structure and efficiency. For UI-related tasks, the author suggests utilizing the "Frontend Design Skill" by Anthropic alongside the "Awesome Design MD" file to maintain consistent design aesthetics across generated modules.

Configuration for Autonomous Execution

To maximize the utility of the free or $20 tier, users should leverage the /goal command, which allows the agent to execute tasks autonomously until completion. For a fully hands-off experience, the "auto proceeded" setting should be enabled within the IDE configuration.

Technical setup should include:

• Enabling "Browser Tools" in the settings menu, including configuring pathing and JavaScript execution policies.
• Defining browser actuation rules to restrict which websites the agent can interact with.
• Installing standard VS Code language servers and design extensions directly into the IDE to enhance the development environment.
• Monitoring usage via the "Antigravity limits" dashboard to stay within the 3x increased rate limits provided for Gemini models.