@intisy-ai/antigravity-auth

Google Antigravity provider for OpenCode and Claude Code, built as a thin driver on top of core-auth. core-auth owns all the generic work (multi-account storage, selection/rotation, token refresh, and rate-limit/cooldown state) while this package supplies only the antigravity specifics: the request/response transform, the Cloud Code Assist endpoints, and the Google OAuth login. The same account pool is shared by both OpenCode and Claude Code.

Under-the-Hood Architecture

flowchart TD
    subgraph Apps
        OC[OpenCode] -->|auth hook loader.fetch| HANDLE
        CC[Claude Code] -->|claude-code-loader proxy| HANDLE
    end

    subgraph Driver [antigravity-auth driver]
        HANDLE["handleIr(ir, ctx) - delegates to the Java orchestrator"]
        LOGIN["login - CLI: antigravity login"]
        HANDLE -->|POST + endpoint fallback| GOOGLE[(Cloud Code Assist API)]
        LOGIN -->|Google PKCE OAuth| GOOGLE
    end

    subgraph Core [core-auth library bundled in]
        MGR[AccountManager]
        STORE[(accounts.json)]
        MGR <--> STORE
    end

    HANDLE -->|acquire / reportRateLimit / reportSuccess| MGR
    LOGIN -->|addAccount| MGR

Driver Detail

handleIr delegates every decision (model/lane resolve, the account/endpoint retry+rotation loop, IR<->Gemini request/response translation, and rate-limit classification) to the Java orchestrator (java/antigravity-provider, TeaVM-compiled, called via driver/javaHandle.ts/javaStream.ts). The provider is IR-native: the front-door owns app<->IR translation, so no app-wire (Anthropic) format code lives here. This TS layer owns only host I/O: the fetch + proxy transport, AccountManager acquisition/reporting, project-context discovery, OAuth login, device fingerprinting, and the version pool.

Structure

• src/
  • index.ts: OpenCode entry (the core-auth provider plugin)
  • handler.ts: Claude Code entry (handleIr() for the claude-code-loader proxy front-door)
  • cli.ts: antigravity login | list | remove
  • driver/: index.ts (driver + handleIr), config.ts, models.ts, login.ts, accounts-controller.ts, javaHandle.ts/javaStream.ts (the Java orchestrator seam)
  • antigravity/oauth.ts, plugin/{request,project,fingerprint,versions,models-fetch,...}.ts: the host I/O this driver owns (fetch-interception, OAuth, device fingerprint, version pool, model discovery); the request/response transform and decision logic lives in java/antigravity-provider (TeaVM-compiled, called via driver/javaHandle.ts)
  • commands.ts: cross-app slash-command definitions and their CLI actions
  • core-auth/: the core-auth library (git submodule, bundled into the output)
  • core/: shared intisy-ai/core submodule (config + logging + command framework), bundled in
• dist/
  • bundled index.js, handler.js, cli.js (generated; not committed)

Installation

Via plugin-updater (recommended)

npx plugin-updater@latest init https://github.com/intisy-ai/antigravity-auth

Via npm

npm install @intisy-ai/antigravity-auth

Configuration

Config file: <configDir>/config/antigravity.json (edit via the loader or /antigravity-config set).

{
  "debug": false,
  "debug_tui": false,
  "keep_thinking": false,
  "claude_tool_hardening": true,
  "claude_prompt_auto_caching": false,
  "cli_first": false,
  "account_selection_strategy": "hybrid",
  "default_retry_after_seconds": 60,
  "max_backoff_seconds": 60,
  "request_jitter_max_ms": 0,
  "signature_cache": {
    "enabled": true,
    "memory_ttl_seconds": 3600,
    "disk_ttl_seconds": 172800,
    "write_interval_seconds": 60
  },
  "logging": true
}

| Key | Default | | --- | --- | | debug | false | | debug_tui | false | | keep_thinking | false | | claude_tool_hardening | true | | claude_prompt_auto_caching | false | | cli_first | false | | account_selection_strategy | "hybrid" | | default_retry_after_seconds | 60 | | max_backoff_seconds | 60 | | request_jitter_max_ms | 0 | | signature_cache | {"enabled":true,"memory_ttl_seconds":3600,"disk_ttl_seconds":172800,"write_interval_seconds":60} | | logging | true |

Commands

| Command | Description | Arguments | | --- | --- | --- | | /antigravity-config | View and change antigravity configuration | list | get <key> | set <key> <value> | | /antigravity-accounts | List signed-in Antigravity accounts | |

Dependencies

• core
• core-auth
• sync-bridge

Logging

Logs are written to <configDir>/logs/YYYY-MM-DD/@intisy-ai/antigravity-auth-HH-MM-SS.log and are toggled by this plugin's logging config (default on). Console mirroring is global, off by default, and controlled by the shared config/settings.json logConsole flag.

License

MIT.