feat: Add Antigravity IDE integration

[AHGGG]

Motivation and Context

This integration allows Antigravity users to access the full Superpowers skill library.

How Has This Been Tested?

Tested all CLI commands on Windows 10 with Node.js v22.12.0 Verified global workflow commands are recognized by Antigravity IDE Verified auto bootstrap and use-skill superpowers:brainstorming work correctly

Breaking Changes

None. This is a new integration that does not affect existing Claude Code, Codex, or OpenCode implementations.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update

Checklist

• [x] I have read the MCP Documentation
• [x] My code follows the repository's style guidelines
• [x] New and existing tests pass locally
• [x] I have added appropriate error handling
• [x] I have added or updated documentation as needed

Additional context

The CLI script reuses lib/skills-core.js for consistent skill discovery and parsing across all platforms Skills directory is derived from script location (not hardcoded), enabling both local development and installed use Tool mapping follows Antigravity's native tool names (view_file, write_to_file, run_command, browser_subagent)

Summary by CodeRabbit

• Documentation
  • Added comprehensive installation, configuration, usage, updating, and troubleshooting guides for Antigravity IDE integration with Superpowers.
  • Included platform-specific instructions and commands for Linux, macOS, and Windows.
  • Updated README with Antigravity IDE usage workflows and links to the new detailed integration docs.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai[bot]]

📝 Walkthrough

Walkthrough

Adds two Antigravity IDE usage blocks to README and introduces two new documentation files (.antigravity/INSTALL.md and docs/README.antigravity.md) providing installation, platform-specific setup, skill linking, usage examples, update procedures, and troubleshooting for integrating Superpowers into Antigravity (documentation only).

Changes

Cohort / File(s)	Summary
Antigravity README updates README.md	Two "Antigravity IDE" usage blocks added, each referencing .antigravity/INSTALL.md and linking to docs/README.antigravity.md.
Local IDE install guide .antigravity/INSTALL.md	New installation and usage guide for Superpowers within Antigravity IDE (clone repo, copy skills to .agent/skills, configure GEMINI.md, verification commands, update procedure, global install alternative, personal skills guidance).
Detailed docs docs/README.antigravity.md	New comprehensive documentation covering Quick Install, Manual Installation (Linux/macOS/Windows), configuring global rules, verification, usage examples mapping prompts to skills, updating, and help resources.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇
I hopped through folders, soft and spry,
Placed neat instructions, clear and spry.
Skills are linked, the steps align—
A little hop, the docs refine. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'feat: Add Antigravity IDE integration' accurately reflects the main change: adding documentation and integration files for Antigravity IDE support, covering INSTALL.md, README updates, and detailed integration guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[obra]

I'd love to have a couple antigravity users test this out. (Also, it needs to be not windows-specific before we can really consider it for merge)

[hopewithoute]

I'd love to have a couple antigravity users test this out. (Also, it needs to be not windows-specific before we can really consider it for merge)

Its kinda worked ish on antigravity, just need to ask load superpower at session start, but the q&a is skipped so the review flow is done using implementation plan comment

[IshizuEitaro]

Just tried Antigravity and this. It works well on my end, but users need to change Terminal default profile first.

Win 11

EDIT: Antigravity automatically reads GEMINI.md instruction and runs Superpowers bootstrap. I don't need to ask anything.

[hopewithoute]

Might be relevant, https://antigravity.google/docs/skills Ag release their own skill system

[AHGGG]

Might be relevant, https://antigravity.google/docs/skills Ag release their own skill system

Refactored to support Antigravity's native Skills integration. During verification, I found that the global installation path (~/.gemini/antigravity/skills) wasn't consistently recognized by the IDE. Therefore, the documentation has been updated to recommend the workspace-level installation (.agent/skills), which has been verified to work correctly.