Install Pixel
Pixel is a command-line tool: Antigravity runs the pixel binary, so install it first (macOS and Linux).
brew install LivioGama/tap/pixelThe install script is the other channel. Neither one changes any agent’s configuration.
What pixel install writes
pixel installRun it once, from anywhere; it writes Antigravity’s files only when Antigravity's config directory, ~/.gemini/config, exists. For Antigravity:
~/.gemini/config/plugins/pixel/~/.gemini/config/config.json~/.gemini/config/hooks.json
The Pixel plugin deployed and enabled, and its guard hooks registered.
Every pixel install also deploys the prompt itself to ~/.local/share/pixel/agent-prompt.md and ~/.local/share/pixel/subagent-prompt.md, and wires the other agents it finds.
The plugin carries the prompt twice, as a rule and as a skill (rules/AGENTS.md, skills/pixel/SKILL.md). config.json enables it, and hooks.json runs Pixel's guard before Antigravity's run_command, grep_search, find_by_name and view_file calls, in every workspace.
Check it
pixel doctor .pixel doctor . reports the wiring of every agent as green, stale or missing, and names the command that repairs each finding. For Antigravity alone:
pixel doctor . --only install.antigravityRemove it
pixel uninstallIt removes everything pixel install wrote, for every agent at once, and the binary at ~/.local/bin/pixel, where the install script puts it. A package manager removes its own copy: brew uninstall LivioGama/tap/pixel.