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First commit - auth and models working
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‎.gitignore‎

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# dependencies (bun install)
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node_modules
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# output
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out
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dist
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*.tgz
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# code coverage
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coverage
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*.lcov
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# logs
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logs
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_.log
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report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
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antigravity-debug-*.log
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# dotenv environment variable files
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.env
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.env.development.local
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.env.test.local
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.env.production.local
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.env.local
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# caches
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.eslintcache
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.cache
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*.tsbuildinfo
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# IntelliJ based IDEs
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.idea
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# Finder (MacOS) folder config
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.DS_Store

‎LICENSE‎

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MIT License
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Copyright (c) 2025 Jens
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md‎

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# Antigravity OAuth Plugin for Opencode
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[![npm version](https://img.shields.io/npm/v/opencode-antigravity-auth.svg)](https://www.npmjs.com/package/opencode-antigravity-auth)
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Enable Opencode to authenticate against **Antigravity** (Google's IDE) via OAuth so you can use Antigravity rate limits and access models like `gemini-3-pro-high` and `claude-opus-4-5-thinking` with your Google credentials.
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## What you get
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- **Google OAuth sign-in** with automatic token refresh
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- **Antigravity API compatibility** for OpenAI-style requests
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- **Debug logging** for requests and responses
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- **Drop-in setup**—Opencode auto-installs the plugin from config
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## Quick start
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1) **Add the plugin to config** (`~/.config/opencode/opencode.json` or project `.opencode.json`):
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```json
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{
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"plugin": ["opencode-antigravity-auth"]
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}
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```
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2) **Authenticate**
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- Run `opencode auth login`.
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- Choose Google → **OAuth with Google (Antigravity)**.
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- Sign in via the browser and return to Opencode. If the browser doesn’t open, use the printed link.
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3) **Declare the models you want**
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Add Antigravity models under the `provider.google.models` section of your config:
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```json
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{
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"plugin": ["opencode-antigravity-auth"],
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"provider": {
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"google": {
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"models": {
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"gemini-3-pro-high": {
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"name": "Gemini 3 Pro High (Antigravity)",
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"limit": { "context": 1048576, "output": 65535 }
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},
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"gemini-3-pro-low": {
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"name": "Gemini 3 Pro Low (Antigravity)",
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"limit": { "context": 1048576, "output": 65535 }
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},
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"claude-sonnet-4-5": {
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"name": "Claude Sonnet 4.5 (Antigravity)",
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"limit": { "context": 200000, "output": 64000 }
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},
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"claude-sonnet-4-5-thinking": {
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"name": "Claude Sonnet 4.5 Thinking (Antigravity)",
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"limit": { "context": 200000, "output": 64000 }
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},
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"claude-opus-4-5-thinking": {
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"name": "Claude Opus 4.5 Thinking (Antigravity)",
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"limit": { "context": 200000, "output": 64000 }
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},
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"gpt-oss-120b-medium": {
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"name": "GPT-OSS 120B Medium (Antigravity)",
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"limit": { "context": 131072, "output": 32768 }
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}
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}
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}
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}
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}
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```
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4) **Use a model**
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```bash
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opencode run "Hello world" --model=google/gemini-3-pro-high
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```
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## Debugging
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Enable verbose logging:
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```bash
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export OPENCODE_ANTIGRAVITY_DEBUG=1
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```
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Logs are written to the current directory (e.g., `antigravity-debug-<timestamp>.log`).
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## Development
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```bash
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npm install
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```
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## Safety, usage, and risk notices
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### Intended use
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- Personal / internal development only
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- Respect internal quotas and data handling policies
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- Not for production services or bypassing intended limits
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### Not suitable for
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- Production application traffic
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- High-volume automated extraction
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- Any use that violates Acceptable Use Policies
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### ⚠️ Warning (assumption of risk)
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By using this plugin, you acknowledge and accept the following:
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- **Terms of Service risk:** This approach may violate the Terms of Service of AI model providers (Anthropic, OpenAI, etc.). You are solely responsible for ensuring compliance with all applicable terms and policies.
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- **Account risk:** Providers may detect this usage pattern and take punitive action, including suspension, permanent ban, or loss of access to paid subscriptions.
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- **No guarantees:** Providers may change APIs, authentication, or policies at any time, which can break this method without notice.
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- **Assumption of risk:** You assume all legal, financial, and technical risks. The authors and contributors of this project bear no responsibility for any consequences arising from your use.
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Use at your own risk. Proceed only if you understand and accept these risks.
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## Legal
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- Not affiliated with Google. This is an independent open-source project and is not endorsed by, sponsored by, or affiliated with Google LLC.
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- "Antigravity", "Gemini", "Google Cloud", and "Google" are trademarks of Google LLC.
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- Software is provided "as is", without warranty. You are responsible for complying with Google's Terms of Service and Acceptable Use Policy.
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## Credits
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- Inspired by and different from [opencode-gemini-auth](https://github.com/jenslys/opencode-gemini-auth) by [jenslys](https://github.com/jenslys). Thanks for the groundwork! 🚀
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- Thanks to [CLIProxyAPI](https://github.com/router-for-me/CLIProxyAPI) for the inspiration.

‎bun.lock‎

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‎index.ts‎

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export {
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AntigravityCLIOAuthPlugin,
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GoogleOAuthPlugin,
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} from "./src/plugin";
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export {
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authorizeAntigravity,
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exchangeAntigravity,
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} from "./src/antigravity/oauth";
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export type {
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AntigravityAuthorization,
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AntigravityTokenExchangeResult,
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} from "./src/antigravity/oauth";

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