Antigravity Provider

Access premium AI models (Claude Opus 4.6, Claude Sonnet 4.6, Gemini 3 Pro) through Antigravity’s OAuth-based platform. Features real-time quota monitoring and multi-account support.

Overview

Antigravity provides access to Claude and Gemini models through a subscription service. CCS integrates seamlessly with OAuth authentication and real-time quota tracking. Provider Identifier: agy Command: ccs agy Supported Models:

Claude Opus 4.6 Thinking (default) - Latest flagship with extended thinking
Claude Opus 4.6 - Latest flagship standard
Claude Sonnet 4.6 Thinking - Balanced with extended thinking
Claude Sonnet 4.6 - Fast and capable
Gemini 3 Pro - Google’s latest model via Antigravity
Interactive model picker via --config

Claude 4.5 model IDs are deprecated in AGY as of v7.51. Existing sessions referencing 4.5 model IDs are automatically migrated to their 4.6 equivalents. Re-run ccs doctor --fix if you see 502 errors after upgrading.

Do not reuse the same Google account for both ccs gemini and ccs agy. Using one Google account across both providers causes token conflicts and authentication failures (see issue #509). Use separate Google accounts for each provider.

Authentication

First-Time Setup

# Run Antigravity for the first time
ccs agy "analyze this code"

# Browser opens automatically
# → Complete OAuth login
# → Token cached at ~/.ccs/cliproxy/auth/
# → Future runs require no re-auth

Authentication Flow:

Authorization Code flow via browser callback
OAuth tokens include project_id for quota API access
Token cached locally with auto-refresh
Proactive token refresh prevents mid-request failures

Manual Authentication

# Authenticate without starting a session
ccs agy --auth

# Headless mode (server/SSH environments)
ccs agy --headless
# → Displays URL for manual browser authentication
# → Includes SSH tunnel instructions if needed

Logout

# Clear all Antigravity tokens
ccs agy --logout

Real-Time Quota Display

Unique Feature: CCS displays real-time quota percentages for Antigravity accounts.

# Quota checked automatically before execution
ccs agy "your prompt"

# Output before Claude starts:
# [i] Antigravity Quota:
#     Claude Opus 4.5 Thinking: 85% used (resets 2024-01-05 23:59:59 UTC)
#     Gemini 3 Pro: 42% used (resets 2024-01-05 23:59:59 UTC)

Quota API Integration:

Fetches from Antigravity internal API
Displays usage percentage (0-100%)
Shows reset time for each model
Auto-refreshes tokens if expired

Error Handling:

403 Forbidden: Account lacks quota access (displays warning)
Unprovisioned: Account not activated in Antigravity app (prompts to sign in)
Token Expired: Auto-refreshes via Google OAuth

Multi-Account Support

Manage multiple Antigravity accounts for quota rotation:

Add Account

# Add new account (preserves existing)
ccs agy --auth --add

List Accounts

# Show all authenticated Antigravity accounts
ccs agy --accounts

# Output:
# Accounts for agy:
#   [default] work (work@company.com) - Quota: 85%
#   personal (personal@gmail.com) - Quota: 12%

Switch Account

# Switch to specific account by nickname
ccs agy --use personal

# Next command uses personal's account
ccs agy "your prompt"

Rename Account

# Rename default account nickname
ccs agy --nickname main-account

Account Registry: ~/.ccs/cliproxy/accounts.json Auto-Nicknames: Generated from email prefix (e.g., john@gmail.com → john)

Model Configuration

Antigravity supports interactive model selection with extended context support:

# Open model picker
ccs agy --config

# Interactive menu appears:
# Available models for Antigravity:
# 1. Claude Opus 4.6 Thinking (Recommended, default)
# 2. Claude Opus 4.6
# 3. Claude Sonnet 4.6 Thinking
# 4. Claude Sonnet 4.6
# 5. Gemini 3 Pro
# 6. Gemini 3 Pro Preview
# Select model [1-6]:

Model Settings: ~/.ccs/agy.settings.json First-Run Behavior: Prompts for model selection before first execution Extended Context Support:

Claude Opus 4.6: Use --1m flag for 1M token window (opt-in)
Gemini 3 Pro: 1M token window auto-enabled by default
Other models: Standard context windows

Auto-Rotation: CLIProxyAPI can auto-rotate accounts on rate limit (configured in config.yaml)

Commands

Basic Usage

# Run with Antigravity
ccs agy "explain this architecture"

# Interactive chat
ccs agy

Authentication Flags

Flag	Description
`--auth`	Trigger OAuth flow (no session)
`--logout`	Clear all tokens
`--headless`	Display URL for remote auth
`--auth --add`	Add new account (keep existing)

Account Management Flags

Flag	Description
`--accounts`	List all accounts with quota info
`--use <nickname>`	Switch default account
`--nickname <name>`	Rename default account

Configuration Flags

Flag	Description
`--config`	Interactive model picker

Storage Locations

Path	Purpose
`~/.ccs/cliproxy/auth/antigravity-*.json`	OAuth tokens (one per account)
`~/.ccs/cliproxy/accounts.json`	Account registry with nicknames
`~/.ccs/agy.settings.json`	Model configuration
`~/.ccs/cliproxy/config.yaml`	CLIProxy unified config

Quota Management

Pre-flight Check

CCS checks account quota before starting sessions:

# Automatic quota check before execution
ccs agy "your prompt"
# → Checks all accounts, selects healthiest one
# → Skips exhausted or paused accounts

Configuration:

# config.yaml
quota_management:
  mode: hybrid  # auto | manual | hybrid
  auto:
    preflight_check: true      # Check before request
    exhaustion_threshold: 5    # Skip accounts below 5%
    tier_priority: ["paid"]    # Prefer paid accounts
    cooldown_minutes: 5        # Skip exhausted for 5min

Pause/Resume Accounts

Manually control which accounts are used:

# Pause an account from rotation
ccs cliproxy pause agy user@gmail.com

# Resume a paused account
ccs cliproxy resume agy user@gmail.com

# Check status of all accounts
ccs cliproxy status agy

Dashboard: Pause/resume toggles also available in web dashboard account dropdown.

Project ID Display

Dashboard shows GCP project_id for each Antigravity account:

Location: OAuth Providers → Antigravity → Account dropdown
Field: Read-only with folder icon (FolderCode)
Privacy: Respects privacy blur mode (Settings → Privacy)
Tooltip: “GCP Project ID (read-only)”

Warning State: If project_id shows “N/A” with warning badge:

Cause: Account authenticated before project_id tracking
Impact: Quota API calls may fail
Solution: Re-authenticate to refresh token with project_id

# Fix missing project_id
ccs agy --logout
ccs agy --auth
# Verify in Dashboard: OAuth Providers → Antigravity

Account Tiers

Antigravity accounts have tier classifications for quota prioritization: Tier Types:

Tier	Description	Priority
`ultra`	Premium tier with highest limits	Highest
`pro`	Professional tier with standard limits	Medium
`free`	Free tier with limited quota	Lowest
`unknown`	Tier detection failed	Lowest

Tier Storage: ~/.ccs/cliproxy/accounts.json → .providers.agy.accounts[].tier Tier Prioritization: CCS uses tier information for intelligent account selection:

# config.yaml
quota_management:
  auto:
    tier_priority: ["ultra", "pro", "free"]  # Selection order

When multiple accounts are available, CCS prefers higher-tier accounts:

Select accounts with quota above threshold
Sort by tier (ultra, pro, free — highest first)
Use highest-tier account with available quota

Dashboard Display: Tier badges appear in:

Account list (ccs agy --accounts)
Dashboard OAuth Providers → Antigravity dropdown
Quota status cards

Tier Detection: CCS reads the live Antigravity tier from loadCodeAssist whenever quota refresh runs. Manual tier values in accounts.json or the Dashboard remain useful as a fallback when the provider cannot return tier evidence.

Token Format

{
  "type": "antigravity",
  "access_token": "...",
  "refresh_token": "...",
  "email": "user@example.com",
  "expired": "2024-12-31T23:59:59Z",
  "project_id": "..."
}

Project ID: Required for quota API calls, obtained during OAuth flow

Quota API Endpoints

CCS uses Antigravity’s internal API:

loadCodeAssist - Get project ID and tier evidence. CCS tries the daily Cloud Code host first and falls back to the production host if needed.
fetchAvailableModels - Get quota percentages & reset times

Authentication: OAuth tokens from ~/.ccs/cliproxy/auth/antigravity-*.json Auto-Refresh: Tokens refresh automatically if expired or expiring soon (under 5 minutes)

Quota Response

{
  models: [
    {
      name: "gemini-3-pro-high",
      displayName: "Gemini 3 Pro",
      percentage: 85,  // 0-100
      resetTime: "2024-01-05T23:59:59Z"
    }
  ],
  lastUpdated: 1704499200000,
  isForbidden: false,
  isUnprovisioned: false
}

Requirements

Antigravity subscription
Browser for OAuth (or --headless for servers)
Network access to Antigravity authentication servers

Troubleshooting

Quota Not Displaying

# Check account status
ccs agy --accounts

# Re-authenticate if needed
ccs agy --logout
ccs agy --auth

Account Unprovisioned

Error: “Account not activated in Antigravity app” Solution: Sign in to Antigravity web app at least once to provision your account

403 Forbidden on Quota API

Error: “Account lacks quota access” Solution: Verify subscription is active. Contact Antigravity support if issue persists.

Project ID Shows N/A

Warning: “Project ID: N/A” in Dashboard account dropdown Cause: OAuth token missing project_id (authenticated before feature added) Solution:

Remove account: ccs agy --logout
Re-authenticate: ccs agy --auth
Verify in Dashboard: OAuth Providers → Antigravity → Account dropdown
Confirm project_id displays (e.g., “project-123456”)

Note: Re-authentication is required only once per account. Project ID persists after successful OAuth.

Token Expiry

Tokens refresh automatically. If refresh fails:

# Re-authenticate
ccs agy --auth

Cost Information

Antigravity Subscription Required: Check antigravity.dev for current pricing Usage Limits: Subject to quota limits shown in real-time display

Next Steps

Multi-Account Setup

Manage multiple Antigravity accounts

​Antigravity Provider

​Overview

​Authentication

​First-Time Setup

​Manual Authentication

​Logout

​Real-Time Quota Display

​Multi-Account Support

​Add Account

​List Accounts

​Switch Account

​Rename Account

​Model Configuration

​Commands

​Basic Usage

​Authentication Flags

​Account Management Flags

​Configuration Flags

​Storage Locations

​Quota Management

​Pre-flight Check

​Pause/Resume Accounts

​Project ID Display

​Account Tiers

​Token Format

​Quota API Endpoints

​Quota Response

​Requirements

​Troubleshooting

​Quota Not Displaying

​Account Unprovisioned

​403 Forbidden on Quota API

​Project ID Shows N/A

​Token Expiry

​Cost Information

​Next Steps

Multi-Account Setup

Antigravity Provider

Overview

Authentication

First-Time Setup

Manual Authentication

Logout

Real-Time Quota Display

Multi-Account Support

Add Account

List Accounts

Switch Account

Rename Account

Model Configuration

Commands

Basic Usage

Authentication Flags

Account Management Flags

Configuration Flags

Storage Locations

Quota Management

Pre-flight Check

Pause/Resume Accounts

Project ID Display

Account Tiers

Token Format

Quota API Endpoints

Quota Response

Requirements

Troubleshooting

Quota Not Displaying

Account Unprovisioned

403 Forbidden on Quota API

Project ID Shows N/A

Token Expiry

Cost Information

Next Steps