Antigravity Kit

AI Agent Capability Expansion Toolkit - A comprehensive collection of skills, rules, and workflows for AI coding assistants.

Table of Contents

• Introduction
• Supported IDEs
• Installation
• Skills
• Rules
• Usage
• Credits
• Contributing

Introduction

Antigravity Kit is a comprehensive collection of:

• Skills - Domain-specific expertise (React, Node.js, Database, Testing, UI/UX...)
• Rules - Guidelines and constraints for agent behavior
• Modes - Task-specific workflows (Build, Debug, Optimize, Review...)

This toolkit combines the best of:

• UI UX Pro Max - Design Intelligence with 50 styles, 21 palettes, 50 font pairings
• ClaudeKit - Production-ready AI subagents, workflows, and integrations

Supported IDEs

| IDE | Folder | Features | |-----|--------|----------| | OpenCode | .opencode/ + AGENTS.md | Skills loaded on-demand, minimal context (~2500 tokens) | | Antigravity | .agent/ | Full rules with activation types, workflows |

Both IDEs share the same skills and capabilities, optimized for each platform's architecture.

Installation

Using CLI (Recommended)

# Navigate to your project
cd your-project

# Install for both IDEs (recommended)
npx @duck4nh/antigravity-kit init

# Or specify target IDE
npx @duck4nh/antigravity-kit init --ide opencode
npx @duck4nh/antigravity-kit init --ide antigravity
npx @duck4nh/antigravity-kit init --ide both

CLI Commands

| Command | Description | |---------|-------------| | npx @duck4nh/antigravity-kit init | Install into current directory | | npx @duck4nh/antigravity-kit update | Update to the latest version | | npx @duck4nh/antigravity-kit status | Check installation status |

CLI Options

| Option | Description | |--------|-------------| | -i, --ide <target> | Target IDE: antigravity, opencode, or both | | -f, --force | Overwrite existing installation | | -p, --path <dir> | Custom project path | | -b, --branch <name> | Use specific branch |

Skills

Skills are domain-specific expertise modules loaded on-demand by the agent.

Frontend

| Skill | Description | |-------|-------------| | react-expert | React 18/19, hooks, patterns, performance | | nextjs-expert | App Router, Server Components, SSR | | css-expert | CSS architecture, responsive, design systems | | state-management-expert | Redux, Zustand, React Query | | ui-ux-pro-max | 50 styles, 21 palettes, 50 font pairings | | accessibility-expert | WCAG compliance, a11y testing |

Backend

| Skill | Description | |-------|-------------| | nodejs-expert | Async patterns, modules, performance | | nestjs-expert | Module architecture, DI, testing | | rest-api-expert | RESTful design, HTTP semantics | | auth-expert | JWT, OAuth 2.0, RBAC, security |

Database

| Skill | Description | |-------|-------------| | prisma-expert | Schema design, migrations, queries | | database-expert | General database optimization | | postgres-expert | PostgreSQL-specific patterns | | mongodb-expert | MongoDB document modeling |

Testing

| Skill | Description | |-------|-------------| | testing-expert | General testing strategies | | jest-expert | Jest framework, mocking | | vitest-expert | Vitest, Vite integration | | playwright-expert | E2E testing, browser automation |

DevOps & Tools

| Skill | Description | |-------|-------------| | devops-expert | CI/CD, infrastructure | | docker-expert | Containerization, Compose | | github-actions-expert | GitHub Actions workflows | | git-expert | Git workflows, conflicts | | typescript-expert | TypeScript patterns, type system |

Workflow Modes

| Skill | Description | |-------|-------------| | mode-consulting | Compare options, make recommendations | | mode-build | Create features, components, modules | | mode-debug | Fix bugs, analyze root cause | | mode-optimize | Refactor, improve performance | | mode-learn | Explain concepts, code, architecture | | mode-review | Code review, security audit | | mode-migrate | Version upgrades, stack migrations |

Rules

Rules are guidelines that direct agent behavior (Antigravity only).

Activation Types

| Type | Description | |------|-------------| | always_on | Always applied | | model_decision | Agent decides when to apply |

Rules List

| File | Activation | Description | |------|------------|-------------| | 01-identity.md | Always On | Role & working principles | | 02-task-classification.md | Always On | Task types classification | | 03-mode-consulting.md | Model Decision | Consulting process | | 04-mode-build.md | Model Decision | Build process | | 05-mode-debug.md | Model Decision | Debug process | | 06-mode-optimize.md | Model Decision | Optimization process | | 07-mode-learn.md | Model Decision | Learning/explaining process | | 08-mode-review.md | Model Decision | Code review process | | 09-mode-migrate.md | Model Decision | Migration process | | 10-technical-standards.md | Always On | Coding standards | | 11-communication.md | Always On | Communication style | | 12-checklist.md | Always On | Pre-delivery checklist | | 13-special-situations.md | Always On | Edge case handling |

Usage

OpenCode

Skills are automatically loaded when the agent identifies a related task:

User: "Fix bug in this React component"
Agent: (loads react-expert skill on-demand)

Tips:

• Press Tab to switch between Build and Plan modes
• AGENTS.md contains core rules (~2500 tokens for minimal context)
• Skills loaded on-demand to save context

Antigravity

Rules apply based on activation type:

• always_on: Always active
• model_decision: Agent decides when to apply

Skills are available in .agent/skills/ and loaded automatically.

Project Structure

your-project/
├── .opencode/                  # OpenCode configuration
│   ├── opencode.json           # Config file
│   └── skill/                  # 42+ skills
│       ├── react-expert/
│       ├── typescript-expert/
│       └── ...
├── .agent/                     # Antigravity configuration
│   ├── rules/                  # 13 rule files
│   ├── skills/                 # 35+ skills
│   └── workflows/              # Workflow definitions
├── shared/                     # Shared resources
│   └── ui-ux-pro-max/          # UI/UX design data
│       ├── data/               # CSV databases
│       └── scripts/            # Search scripts
└── AGENTS.md                   # Core rules for OpenCode

Credits

This project is built upon and inspired by:

| Project | Description | Link | |---------|-------------|------| | UI UX Pro Max | Design Intelligence - 50 styles, 21 palettes, 50 font pairings | ui-ux-pro-max-skill.nextlevelbuilder.io | | ClaudeKit | Production-ready AI subagents and workflows | claudekit.cc |

Contributing

Adding a New Skill

1. Create folder in both locations:

   • .opencode/skill/your-skill/SKILL.md
   • .agent/skills/your-skill/SKILL.md

2. Use correct frontmatter:

OpenCode format:

---
name: your-skill
description: >-
  Skill description (max 1024 chars). Explain when to use this skill.
license: MIT
compatibility: opencode
metadata:
  category: frontend
---

# Your Skill

Instructions for the agent...

Antigravity format:

---
name: your-skill
description: Skill description. Use when X or Y.
---

# Your Skill

Instructions for the agent...

Adding a New Rule (Antigravity only)

1. Create file: .agent/rules/XX-your-rule.md
2. Add frontmatter:

---
activation: always_on | model_decision
description: When to apply (if model_decision)
---

# Your Rule

Content...

License

MIT License - See LICENSE for details.