Google Antigravity vs Goose

Google Antigravity vs GooseComparisonUpdated 2026-03-18

SUMMARY

Google Antigravity (IDE) uses markdown configuration while Goose (CLI) uses text. They differ on 4 of 11 compared features. Both tools provide AI-assisted development but take different approaches to project configuration.

FEATURE COMPARISON

Feature	Google Antigravity	Goose	Notes
Config format	markdown	text
Hierarchy support	✓	✓	Whether config files can be placed at multiple directory levels
Global config	✗	✓	User-wide configuration outside any project
Project config	✓	✓
Subdirectory scoping	✓	✗	Config files in subdirectories that apply only to that subtree
File inclusion / imports	✗	✗	Ability to include or reference other files from config
Ignore file	✗	✗
IDE integration	✓	CLI
Schema / structure	Free-form (Markdown)	Free-form (Markdown)	Whether config uses structured schema or free-form content
Git committed	✓	✓	Whether primary config files are intended to be version-controlled
Encoding	UTF-8	UTF-8

FILE MAPPING

Purpose	Google Antigravity	Goose
Project instructions	AGENTS.md	.goosehints
Project instructions	GEMINI.md	AGENTS.md

SIDE-BY-SIDE CODE SAMPLES

Google Antigravity

AGENTS.md

markdown

# Project Instructions

## Architecture
- Monorepo with apps/ and packages/ directories
- Each app is a standalone Next.js deployment
- Shared packages use TypeScript project references

## Code Standards
- TypeScript strict mode everywhere
- Use Zod for runtime validation at API boundaries
- Prefer server components; use "use client" only when needed
- All database queries go through the data-access layer

## Testing
- Unit tests with Vitest for business logic
- Integration tests for API routes
- E2E tests with Playwright for critical user flows

## Deployment
- Preview deployments on every PR
- Production deploys from main branch only
- Environment variables managed via .env.local (never committed)

Goose

.goosehints

text

This is a Ruby on Rails 7.2 application with Hotwire/Turbo.

Database: PostgreSQL 16
Ruby version: 3.3.x
Node: 22.x (for asset pipeline)

Key commands:
- bin/rails server — start dev server
- bin/rails test — run test suite
- bin/rails db:migrate — run migrations

Conventions:
- Use ViewComponents for reusable UI
- Stimulus controllers for JS behavior
- System tests with Capybara + Playwright
- RuboCop for linting (run: bundle exec rubocop)

KEY DIFFERENCES

1. Config format

Google Antigravity: markdown. Goose: text.

2. Global config

Google Antigravity: Not supported. Goose: Supported.

3. Subdirectory scoping

Google Antigravity: Supported. Goose: Not supported.

4. IDE integration

Google Antigravity: Supported. Goose: CLI.

WHICH SHOULD I USE?

Recommendation

Choose based on your IDE/CLI preference. If you use Google Antigravity, configure AGENTS.md. If you use Goose, configure config.yaml. Many projects include config files for multiple tools so each team member can use their preferred editor.

PORTABILITY TIP

sync-instructions.sh

bash

# Maintain a single source of truth:
cp AI-INSTRUCTIONS.md CLAUDE.md
cp AI-INSTRUCTIONS.md .cursorrules
cp AI-INSTRUCTIONS.md AGENTS.md