wtf is cc-to-antigravity-cli-bridge?

This project is a small bridge that lets you call Google's Antigravity CLI, a command line tool the README shortens to agy, from within Claude Code. The goal is not to replace Claude Code as your main tool, but to give it a useful side channel for research and a second set of AI models. The README lists a few concrete reasons this is useful. First, Claude's own web search and web fetch tools sometimes fail on pages protected against bots, while Gemini through agy can often still reach those same pages, so running both and comparing results catches cases Claude alone would miss. Second, it lets you make use of a Gemini subscription you may already be paying for, or received for free through a past promotion, instead of letting that quota sit unused while you do daily work in Claude. Third, agy is not limited to Gemini models. It can also call Claude Sonnet 4.6 and Claude Opus 4.6 for a second opinion or a parallel draft without using up your main Claude Code session. Fourth, the repository includes a short prompt prefix, described as model-agnostic, that pushes any of these tools toward multi-angle searches, dated sources, and a clear, decision-first answer instead of a vague list. Setting it up means installing the Antigravity CLI through Homebrew on macOS or an official install script, then logging in with the Google account tied to your Gemini subscription. The README warns not to set a Gemini API key, since that would make the CLI bill you through the API rather than using your subscription. A bundled shell script applies the research prefix and runs the query from a clean temporary directory so your project's own instruction files do not leak into a pure research question. The project also shows how to symlink your existing Claude instruction file so both tools share the same system prompt. The README is upfront that this is meant to stay a thin bridge: as of the time it was written, agy has no memory system or hook support to sync with, so this project does not attempt to replicate that. It is the third in a small series of similar bridges the author has built for other AI coding tools. The README does not state a license for the code.