SUMMARY
Google Antigravity (IDE) uses markdown configuration while CodeRabbit (Platform) uses yaml. They differ on 5 of 11 compared features. Both tools provide AI-assisted development but take different approaches to project configuration.
FEATURE COMPARISON
| Feature | Google Antigravity | CodeRabbit |
|---|---|---|
| Config format | markdown | yaml |
| Hierarchy support | ✓ | ✗ |
| Global config | ✗ | ✗ |
| Project config | ✓ | ✓ |
| Subdirectory scoping | ✓ | ✗ |
| File inclusion / imports | ✗ | ✗ |
| Ignore file | ✗ | ✗ |
| IDE integration | ✓ | Platform |
| Schema / structure | Free-form (Markdown) | unknown |
| Git committed | ✓ | ✓ |
| Encoding | UTF-8 | UTF-8 |
KEY DIFFERENCES
Google Antigravity: markdown. CodeRabbit: yaml.
Google Antigravity: Supported. CodeRabbit: Not supported.
Google Antigravity: Supported. CodeRabbit: Not supported.
Google Antigravity: Supported. CodeRabbit: Platform.
Google Antigravity: Free-form (Markdown). CodeRabbit: unknown.
WHICH SHOULD I USE?
Choose based on your IDE/CLI preference. If you use Google Antigravity, configure AGENTS.md. If you use CodeRabbit, configure .coderabbit.yaml. Many projects include config files for multiple tools so each team member can use their preferred editor.
PORTABILITY TIP
# Maintain a single source of truth:
cp AI-INSTRUCTIONS.md CLAUDE.md
cp AI-INSTRUCTIONS.md .cursorrules
cp AI-INSTRUCTIONS.md AGENTS.md