Package Exports

opencode-antigravity-auth
opencode-antigravity-auth/dist/index.js
opencode-antigravity-auth/dist/src/constants
opencode-antigravity-auth/dist/src/constants.js
opencode-antigravity-auth/dist/src/plugin/request.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (opencode-antigravity-auth) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Antigravity + Gemini CLI OAuth Plugin for Opencode

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 and claude-opus-4-5-thinking with your Google credentials.

What You Get

Claude Opus 4.5, Sonnet 4.5 and Gemini 3 Pro/Flash via Google OAuth
Multi-account support — add multiple Google accounts, auto-rotates when rate-limited
Dual quota system — access both Antigravity and Gemini CLI quotas from one plugin
Thinking models — extended thinking for Claude and Gemini 3 with configurable budgets
Google Search grounding — enable web search for Gemini models (auto or always-on)
Auto-recovery — handles session errors and tool failures automatically
Plugin compatible — works alongside other OpenCode plugins (oh-my-opencode, dcp, etc.)

Installation

For Humans

Option A: Let an LLM do it

Paste this into any LLM agent (Claude Code, OpenCode, Cursor, etc.):

Install the opencode-antigravity-auth plugin and add the Antigravity model definitions to ~/.config/opencode/opencode.json by following: https://raw.githubusercontent.com/NoeFabris/opencode-antigravity-auth/dev/README.md

Option B: Manual setup

Add the plugin to ~/.config/opencode/opencode.json:
```
{
  "plugin": ["opencode-antigravity-auth@latest"]
}
```
Want bleeding edge features? Use opencode-antigravity-auth@beta instead.
Login with your Google account:
```
opencode auth login
```
Add models — copy the full configuration below

Use it:

opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max

For LLM Agents

Step-by-Step Instructions

Edit the OpenCode configuration file:
- Linux/Mac: ~/.config/opencode/opencode.json
- Windows: %APPDATA%\opencode\opencode.json

Add the plugin to the plugins array:

{
  "plugin": ["opencode-antigravity-auth@latest"]
}

Add the model definitions from the Full models configuration section
Set provider to "google" and choose a model

Verification

opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max

Models

Model Reference

Antigravity quota (Claude + Gemini 3):

Model	Variants	Notes
`antigravity-gemini-3-pro`	low, high	Gemini 3 Pro with thinking
`antigravity-gemini-3-flash`	minimal, low, medium, high	Gemini 3 Flash with thinking
`antigravity-claude-sonnet-4-5`	—	Claude Sonnet 4.5
`antigravity-claude-sonnet-4-5-thinking`	low, max	Claude Sonnet with extended thinking
`antigravity-claude-opus-4-5-thinking`	low, max	Claude Opus with extended thinking

Gemini CLI quota (separate from Antigravity):

Model	Notes
`gemini-2.5-flash`	Gemini 2.5 Flash
`gemini-2.5-pro`	Gemini 2.5 Pro
`gemini-3-flash-preview`	Gemini 3 Flash (preview)
`gemini-3-pro-preview`	Gemini 3 Pro (preview)

Using variants:

opencode run "Hello" --model=google/antigravity-claude-sonnet-4-5-thinking --variant=max

For details on variant configuration and thinking levels, see docs/MODEL-VARIANTS.md.

Full models configuration (copy-paste ready)

Add this to your ~/.config/opencode/opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["opencode-antigravity-auth@latest"],
  "provider": {
    "google": {
      "models": {
        "antigravity-gemini-3-pro": {
          "name": "Gemini 3 Pro (Antigravity)",
          "limit": { "context": 1048576, "output": 65535 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
          "variants": {
            "low": { "thinkingLevel": "low" },
            "high": { "thinkingLevel": "high" }
          }
        },
        "antigravity-gemini-3-flash": {
          "name": "Gemini 3 Flash (Antigravity)",
          "limit": { "context": 1048576, "output": 65536 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
          "variants": {
            "minimal": { "thinkingLevel": "minimal" },
            "low": { "thinkingLevel": "low" },
            "medium": { "thinkingLevel": "medium" },
            "high": { "thinkingLevel": "high" }
          }
        },
        "antigravity-claude-sonnet-4-5": {
          "name": "Claude Sonnet 4.5 (Antigravity)",
          "limit": { "context": 200000, "output": 64000 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
        },
        "antigravity-claude-sonnet-4-5-thinking": {
          "name": "Claude Sonnet 4.5 Thinking (Antigravity)",
          "limit": { "context": 200000, "output": 64000 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
          "variants": {
            "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
          }
        },
        "antigravity-claude-opus-4-5-thinking": {
          "name": "Claude Opus 4.5 Thinking (Antigravity)",
          "limit": { "context": 200000, "output": 64000 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] },
          "variants": {
            "low": { "thinkingConfig": { "thinkingBudget": 8192 } },
            "max": { "thinkingConfig": { "thinkingBudget": 32768 } }
          }
        },
        "gemini-2.5-flash": {
          "name": "Gemini 2.5 Flash (Gemini CLI)",
          "limit": { "context": 1048576, "output": 65536 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
        },
        "gemini-2.5-pro": {
          "name": "Gemini 2.5 Pro (Gemini CLI)",
          "limit": { "context": 1048576, "output": 65536 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
        },
        "gemini-3-flash-preview": {
          "name": "Gemini 3 Flash Preview (Gemini CLI)",
          "limit": { "context": 1048576, "output": 65536 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
        },
        "gemini-3-pro-preview": {
          "name": "Gemini 3 Pro Preview (Gemini CLI)",
          "limit": { "context": 1048576, "output": 65535 },
          "modalities": { "input": ["text", "image", "pdf"], "output": ["text"] }
        }
      }
    }
  }
}

Multi-Account Setup

Add multiple Google accounts for higher combined quotas. The plugin automatically rotates between accounts when one is rate-limited.

opencode auth login  # Run again to add more accounts

For details on load balancing, dual quota pools, and account storage, see docs/MULTI-ACCOUNT.md.

Plugin Compatibility

@tarquinen/opencode-dcp

DCP creates synthetic assistant messages that lack thinking blocks. List this plugin BEFORE DCP:

{
  "plugin": [
    "opencode-antigravity-auth@latest",
    "@tarquinen/opencode-dcp@latest"
  ]
}

oh-my-opencode

Disable built-in auth and override agent models in oh-my-opencode.json:

{
  "google_auth": false,
  "agents": {
    "frontend-ui-ux-engineer": { "model": "google/antigravity-gemini-3-pro" },
    "document-writer": { "model": "google/antigravity-gemini-3-flash" },
    "multimodal-looker": { "model": "google/antigravity-gemini-3-flash" }
  }
}

Tip: When spawning parallel subagents, enable pid_offset_enabled: true in antigravity.json to distribute sessions across accounts.

Plugins you don't need

gemini-auth plugins — Not needed. This plugin handles all Google OAuth.

Configuration

Create ~/.config/opencode/antigravity.json for advanced settings:

{
  "$schema": "https://raw.githubusercontent.com/NoeFabris/opencode-antigravity-auth/main/assets/antigravity.schema.json",
  "quiet_mode": false,
  "debug": false
}

Option	Default	What it does
`quiet_mode`	`false`	Hide toast notifications
`debug`	`false`	Enable debug logging
`session_recovery`	`true`	Auto-recover from tool errors
`auto_resume`	`true`	Auto-send "continue" after recovery
`web_search.default_mode`	`"off"`	Google Search grounding: `"auto"` or `"off"`

For all options, see docs/CONFIGURATION.md.

Environment variables:

OPENCODE_ANTIGRAVITY_DEBUG=1 opencode   # Enable debug logging
OPENCODE_ANTIGRAVITY_DEBUG=2 opencode   # Verbose logging

Troubleshooting

See the full Troubleshooting Guide for solutions to common issues including:

Auth problems and token refresh
"Model not found" errors
Session recovery
Gemini CLI permission errors
Safari OAuth issues
Plugin compatibility
Migration guides

Documentation

Configuration — All configuration options
Multi-Account — Load balancing, dual quota pools, account storage
Model Variants — Thinking budgets and variant system
Troubleshooting — Common issues and fixes
Architecture — How the plugin works
API Spec — Antigravity API reference

Support

If this plugin helps you, consider supporting its maintenance:

Credits

License

MIT License. See LICENSE for details.

Legal

Intended Use

Personal / internal development only
Respect internal quotas and data handling policies
Not for production services or bypassing intended limits

Warning

By using this plugin, you acknowledge:

Terms of Service risk — This approach may violate ToS of AI model providers
Account risk — Providers may suspend or ban accounts
No guarantees — APIs may change without notice
Assumption of risk — You assume all legal, financial, and technical risks

Disclaimer

Not affiliated with Google. This is an independent open-source project.
"Antigravity", "Gemini", "Google Cloud", and "Google" are trademarks of Google LLC.