The Antigravity Pro Developer Playbook#

Using an agentic IDE like Antigravity in 2026 requires a shift from “typing code” to “orchestrating intelligence.” This guide covers the mental models and technical strategies to build complex apps like GenDash while maximizing credit efficiency.

1. The Model Garage: Choosing the Right Engine#

In Antigravity, you have a team of experts. Don’t use a supercar for a grocery run.

2. Mode Mastery: Planning vs. Fast#

The Mode selector determines how much “thinking” the agent does before it touches your files.

Planning Mode#

• When to use: Adding new features (Live Activities), changing the app’s navigation structure, or modifying the database.
• How it works: The agent creates a multi-step roadmap. It performs a discovery phase using the Xcode bridge to ensure it doesn’t break the project.
• Pro Tip: Always review the “Plan” before clicking Run. This is where you catch logic errors before they are committed.

Fast Mode#

• When to use: Changing button colors, updating text labels, or simple one-line logic fixes.
• How it works: The agent executes the task immediately without a roadmap.
• Benefit: Massive credit savings and near-instant execution.

3. Mission-Driven Development (MDD)#

In a 2026 agentic workflow, your MISSION.md is the “Long-Term Memory” of the project.

1. The Ground Truth: Keep a MISSION.md in your root folder containing the math (interpolation formulas), security rules (redaction of UP_UNIFI_PASS), and core requirements.
2. The Handover: When starting a fresh chat, point the agent to this file first. This prevents “AI Drift” and keeps the agent from suggesting old or irrelevant logic.
3. The Sync: Periodically ask the agent: “Update MISSION.md to reflect our current progress and new architectural decisions.”

4. Quota & Credit Management#

Antigravity operates on a tiered usage system. Avoid hitting the “6-day Wall” by managing your history.

The History Tax#

Every time you send a message, the model re-reads the entire chat history.

• Images/Screenshots: Highly effective for UI debugging, but very heavy (500+ tokens per image).
• Resetting Context: Once a feature (like the Dynamic Island) is working and committed to Git, start a new conversation. This wipes the heavy images and old context, making the agent faster and cheaper.

The Emergency Tank#

• AI Credits: Your 1,000 credits are a safety net.
• Overages: Toggle “Enable AI Credit Overages” only when your weekly Pro quota is exhausted and you have critical work to finish.

5. The Xcode Bridge & Sideloading#

Antigravity interacts with Xcode targets, but some tasks still require the “Human in the Loop.”

• Target Creation: Never let an AI try to create a New Target (like a Widget Extension) via the raw .pbxproj file. It will likely corrupt the project. Create targets manually in the Xcode GUI, then let the agent fill them with code.
• Developer Override: When sideloading to a physical iPhone, remember the “Trust” sequence: Settings > General > VPN & Device Management and Settings > Privacy & Security > Developer Mode.
• Orientation & Info.plist: For apps like GenDash, always lock the orientation to Portrait in the Target settings to prevent UI breakage during generator sessions.

6. The “Pro” Routine#

1. Plan with Gemini 3.1 Pro (High).
2. Build with Gemini 3.1 Pro (Low).
3. Refine UI with Gemini 3 Flash.
4. Clean up by starting a New Chat every 2-3 hours of work.
5. Document progress back into MISSION.md.