# Antigravity Oauth: Hermes Agent plugin

> Sign in to Google Antigravity with `hermes auth add antigravity-oauth` (or one command, `npx hermes-antigravity-oauth`) and run Hermes on the Antigravity plan: Gemini 3.x, Claude 4.6, GPT-OSS.

Canonical: https://hermeswatcher.com/plugins/antigravity-oauth  
Tier: Community  
Official page (Nous Research): https://hermes-agent.nousresearch.com/docs/plugins/antigravity-oauth  
Last updated in catalog: 2026-09-27

Sign in to Google Antigravity with `hermes auth add antigravity-oauth` (or one command, `npx hermes-antigravity-oauth`) and run Hermes on the Antigravity plan: Gemini 3.x, Claude 4.6, GPT-OSS. Every request is made by Google's official agy CLI under agy's own login. The plugin writes your Hermes SOUL.md and system prompt into agy's workspace GEMINI.md so the persona carries over. When a model reaches for an agy-native tool (run_command, view_file, grep_search, and so on) the call is re-issued as the matching Hermes tool, which then runs under Hermes approvals. agy never executes tools on the host, and unmapped native tools are blocked.

## Good to know before installing

Inference counts against the Antigravity/Gemini subscription agy is signed in to. The plugin never reads, copies or uploads the OAuth token. It symlinks agy's antigravity-oauth-token file, and on macOS ~/Library/Keychains, into a per-session private temp HOME, which is deleted on close. It also probes the OS keyring (security / secret-tool / cmdkey) for credential presence only. Derived from antigravity-subscription-directsdk (MIT). Disclosure — inference counts against the Antigravity/Gemini subscription agy is signed in to. The plugin does not read or upload the OAuth token itself; it symlinks (hard-links, or as a last resort copies) agy's antigravity-oauth-token file, and on macOS ~/Library/Keychains, into a per-session private temp HOME that is deleted on close, probes the OS keyring (security / secret-tool / cmdkey) for credential presence only, and writes the full Hermes system prompt into that temp workspace as GEMINI.md each turn. Derived from antigravity-subscription-directsdk (MIT).

From the plugin's catalog listing.

## How to install

1. Install it. Hermes asks for any API keys it needs, then asks whether to turn it on.

```bash
hermes plugins install antigravity-oauth
```

2. Said no? Turn it on later:

```bash
hermes plugins enable antigravity-oauth
```

3. Restart Hermes so it loads the plugin.

Some plugins also need a sign-in or settings: see the official page. Memory plugins ask whether to become your memory provider instead. Steps follow the official plugins guide: https://hermes-agent.nousresearch.com/docs/user-guide/features/plugins

## Facts

- Category: AI models & providers
- Maintained by: neerazz (Community)
- Needs: No API keys declared
- Works on: linux, macos, windows
- Requires Hermes: `>=0.21.0`
- Version: 0.1.2
- In the catalog since: 2026-09-27

## Links

- [Full setup and settings (official page)](https://hermes-agent.nousresearch.com/docs/plugins/antigravity-oauth)
- [Source code](https://github.com/neerazz/hermes-antigravity-oauth#readme)
- [All plugins](https://hermeswatcher.com/plugins.md)

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