omp packages

@3d24rd0/pi-antigravity-bridge1.1.0

Antigravity Bridge: Google Antigravity as a Pi model provider. Gemini and Claude on your existing subscription, through the official ACP server or the stream-json agy CLI, with Pi tools bridged to the model.

3d24rd0 Published 3 hours ago MIT ~316 downloads/mo

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Readme

Antigravity Bridge

Antigravity Bridge

Google Antigravity as a Pi model provider.
Gemini 4 Argon, Gemini 3.8 Flash, Claude Sonnet 5.5 and Claude Opus 5.5 on the subscription you already pay for.

npm MIT Pi-native package

What it does

Pi speaks to models. Antigravity only speaks through its own CLI and its own protocol. This package puts a provider in between:

   Pi  ──▶  Antigravity Bridge  ──▶  agy CLI  /  ACP server  ──▶  Google
             │
             └──◀ Pi's tools, served over a localhost MCP bridge
  • Two engines, chosen by the model name. -acp drives Google's official ACP server (images, native diff cards); -cli drives the stream-json agy CLI.
  • Pi's tools work. The model reads files, edits, runs commands and delegates to subagents through a localhost bridge — with real Pi cards, not text dumps.
  • No API key. It rides the Antigravity CLI and server you already signed into. No per-token billing, no key to paste.

Install

Pi

pi install npm:@3d24rd0/pi-antigravity-bridge

Gentle Shell

gentle-shell install npm:@3d24rd0/pi-antigravity-bridge

Then restart. /agy joins the command list and antigravity/ models appear in /model.

Install from git instead, or by hand
pi install git:github.com/3d24rd0/antigravity-bridge

By hand, in ~/.pi/agent/settings.json (Gentle Shell: ~/.gentle-shell/agent/settings.json):

{ "packages": ["git:github.com/3d24rd0/antigravity-bridge"] }

Use it

1. Pick a model. /model → anything under antigravity/. The suffix picks the engine; Pi's thinking toggle picks the reasoning level.

Model Engine Input Best for
antigravity/gemini-4-argon-acp ACP text + image Deep reasoning, native diff cards
antigravity/gemini-3-8-flash-acp ACP text + image Low latency, light quota use
antigravity/gemini-4-argon-cli CLI text Same model, stream-json engine
antigravity/gemini-3-8-flash-cli CLI text Fast execution
antigravity/claude-sonnet-5-5-cli CLI text Balanced speed and quality
antigravity/claude-opus-5-5-cli CLI text Advanced Claude reasoning

Claude models are CLI-only: the ACP server rejects non-Gemini models.

2. Check the wiring once.

/agy doctor     # driver state, CLI and server versions, paths, effective config
/agy quota      # what your subscription has left

3. Just talk. Provider turns, Pi tools, subagents and review all work. The first ACP turn downloads Google's server (~1.5 GB) and asks for a second Google sign-in — one time only, and the -cli models skip it entirely.

/agy

Bare /agy opens the settings menu. Every setting also exists as a subcommand, and Tab completes them:

/agy  doctor  auth  auth-manual  quota  clear  patch-cleanup
      mode  readonly  permissions  timeout  ask  web  bridge  tools
      digest  system-prompt  model  thinking  agent
      tasks  artifacts  subagents  engine  acp-bin

/agy mode accept-edits|plan      # plan is refused, not faked (see Safety)
/agy readonly on|off             # refuse every provider turn
/agy permissions on|off          # native agy tool auto-approval
/agy timeout <1-1440|off>        # overall turn cap
/agy bridge all|mcp|none         # which Pi tools the model can call
/agy tasks [tail <id>]           # background task logs of this conversation
/agy artifacts [open <n|name>]   # files this conversation produced or received

Full reference, every flag and every environment variable: docs/how-it-works.md.

Safety, up front

  • agy runs its own tool loop and is not prompted by Pi by default. An Antigravity turn can execute commands and write files on this machine.
  • The approval gate is opt-in. AGY_APPROVALS=shadow routes mutating native tools through Pi's permission flow; headless sessions deny.
  • Read-only is enforced, never promised. Plan mode cannot be enforced upstream, so the bridge refuses provider turns instead of faking it. Use /agy readonly on, Pi's tool restrictions, or the gate.

Details and threat model: docs/how-it-works.md#safety.

Requirements
Pi Tested against 1.0+; peers are declared * (pi-coding-agent, pi-tui, pi-ai, typebox)
Node ≥ 22
Antigravity CLI agy, signed in once (required by the CLI engine and by AskAntigravity)
Google account with Antigravity access; ACP additionally asks its own sign-in

Development

git clone https://github.com/3d24rd0/antigravity-bridge
cd antigravity-bridge && npm install
npm run check      # tsc --noEmit + vitest

The package ships TypeScript and Pi loads it directly: no build step, so src/ is published as written. Pi finds the entry point through pi.extensions in package.json.

Acknowledgements

Based on the original extension by @EstebanForge. Licensed under MIT.