How to Build a React App Using Antigravity Agents (Step-by-Step)

Building a React app with Antigravity is different from traditional development. Instead of writing code yourself, you orchestrate agents to build it for you.

This guide shows you how.

What We're Building

App: TaskMaster – A task management app
Features:
* Add/edit/delete tasks
* Mark tasks as complete
* Filter by status
* Responsive design

Tech Stack:
* React 18
* Vite
* Tailwind CSS
* Local Storage for persistence

Step 1: Create the Project

Open Antigravity

1. Launch Antigravity
2. Click “New Project”
3. Choose “React + Vite”
4. Name: “taskmaster”
5. Click “Create”

Antigravity creates the project structure automatically.

Step 2: Spawn the First Agent

Open Mission Control

Press `Cmd+Shift+M` to open Mission Control.

Create the “Builder” Agent

1. Click “New Agent”
2. Name: “Builder”
3. Role: “Feature Development”
4. Prompt:

> “Build a task management app with these features:
> – Component structure: App, TaskList, TaskItem, AddTaskForm
> – Use React hooks for state management
> – Style with Tailwind CSS
> – Make it responsive
>
> Start by creating the basic component structure.”

5. Click “Spawn Agent”

Watch the Agent Work

The Builder agent will:
1. Create component files
2. Set up basic structure
3. Add Tailwind configuration
4. Report progress in Mission Control

Time: 2-3 minutes

Step 3: Review and Test

Open the Browser

1. Click “Open in Browser” in Mission Control
2. The integrated browser shows your app
3. Test the basic structure

Provide Feedback

If something's wrong, talk to the agent:

> “The layout is too cramped. Add more padding and spacing.”

The agent updates the code in real-time.

Step 4: Add Functionality

Spawn the “Logic” Agent

1. Click “New Agent”
2. Name: “Logic”
3. Role: “Business Logic”
4. Prompt:

> “Implement the task management logic:
> – Add tasks (title, description)
> – Mark tasks as complete/incomplete
> – Delete tasks
> – Filter tasks (All, Active, Completed)
> – Persist to localStorage
>
> Use React hooks (useState, useEffect).”

5. Click “Spawn Agent”

Parallel Execution

Both agents can work simultaneously:
* Builder refines the UI
* Logic implements functionality

Mission Control shows both agents' progress.

Step 5: Add Styling

Spawn the “Designer” Agent

1. Click “New Agent”
2. Name: “Designer”
3. Role: “UI/UX”
4. Prompt:

> “Improve the visual design:
> – Use a modern color scheme (blues and purples)
> – Add smooth animations (fade-in, slide-up)
> – Improve typography
> – Add hover effects
> – Make buttons more prominent
> – Add icons (use lucide-react)”

5. Click “Spawn Agent”

Step 6: Add Advanced Features

Prompt the Builder Agent

> “Add these features:
> – Due dates for tasks
> – Priority levels (High, Medium, Low)
> – Categories/tags
> – Search functionality
> – Sort by due date or priority”

The Builder agent adds these features incrementally.

Step 7: Testing

Spawn the “Tester” Agent

1. Click “New Agent”
2. Name: “Tester”
3. Role: “Quality Assurance”
4. Prompt:

> “Test the app thoroughly:
> – Add tasks and verify they appear
> – Mark tasks as complete
> – Delete tasks
> – Test filters
> – Test localStorage persistence (refresh the page)
> – Test on mobile (resize browser)
> – Report any bugs”

5. Click “Spawn Agent”

Review Test Results

The Tester agent will:
1. Run automated tests
2. Manually test in the browser
3. Report bugs in Mission Control

Fix Bugs

If bugs are found, assign them to the Builder agent:

> “Fix the bug where tasks don't persist after refresh.”

Step 8: Optimization

Spawn the “Optimizer” Agent

1. Click “New Agent”
2. Name: “Optimizer”
3. Role: “Performance”
4. Prompt:

> “Optimize the app:
> – Reduce bundle size
> – Optimize re-renders (use React.memo, useMemo)
> – Lazy load components
> – Optimize images
> – Add loading states”

5. Click “Spawn Agent”

Step 9: Documentation

Prompt the Builder Agent

> “Create a README.md with:
> – Project description
> – Features list
> – Installation instructions
> – Usage guide
> – Screenshots”

The agent generates comprehensive documentation.

Step 10: Deployment

Spawn the “DevOps” Agent

1. Click “New Agent”
2. Name: “DevOps”
3. Role: “Deployment”
4. Prompt:

> “Deploy this app to Vercel:
> 1. Create a production build
> 2. Set up Vercel configuration
> 3. Deploy
> 4. Provide the live URL”

5. Click “Spawn Agent”

The DevOps agent handles deployment automatically.

Agent Coordination

How Agents Collaborate

Antigravity's Mission Control coordinates agents:
* Builder creates components
* Logic adds functionality
* Designer improves aesthetics
* Tester finds bugs
* Optimizer improves performance
* DevOps deploys

Conflict Resolution

If agents make conflicting changes:
1. Mission Control detects the conflict
2. Pauses both agents
3. Asks you to resolve
4. You choose which change to keep

Advanced: Custom Agent Workflows

Create a Workflow

1. Go to Mission Control > Workflows
2. Click “New Workflow”
3. Define steps:

“`yaml
name: “Feature Development”
steps:
– agent: Builder
task: “Create component structure”
– agent: Logic
task: “Implement functionality”
depends_on: Builder
– agent: Designer
task: “Style components”
depends_on: Builder
– agent: Tester
task: “Test feature”
depends_on: [Logic, Designer]
“`

4. Save workflow
5. Run with one click

Comparing to Traditional Development

Traditional Approach

1. Write component code (30 min)
2. Add state management (20 min)
3. Style with CSS (40 min)
4. Add features (60 min)
5. Test manually (30 min)
6. Fix bugs (30 min)
7. Deploy (15 min)

Total: ~3.5 hours

Antigravity Approach

1. Spawn agents (5 min)
2. Review and provide feedback (30 min)
3. Deploy (5 min)

Total: ~40 minutes

Productivity Gain: 5x faster

Conclusion

Building React apps with Antigravity agents is fundamentally different. You become an orchestrator, not a coder. You define what you want, and agents build it.

At BYS Marketing, we use this approach to build client apps in record time. What used to take weeks now takes days.

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