kizaki-R/Antigravity-Next-for-DSH

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An unofficial model provider plugin for DeepSeek Harness (DSH). It connects locally installed Google Antigravity / Cloud Code Assist models directly to your DSH agent loop under provider id agy-next.

Disclaimer: Unofficial integration. Not affiliated with, endorsed by, or officially supported by Google or DeepSeek. Requires an authorized Google account and a local installation of the official Antigravity application.

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Highlights

• Zero Cloud Console Setup: Resolves OAuth client pairs directly from your local Antigravity installation. No need to create a project or credentials in Google Cloud Console.
• Multi-Account Pooling: Add multiple Google accounts with quota thresholds. When one account runs out, the plugin automatically switches to a standby account.
• Quota Telemetry: Live quota progress bars for Gemini, Claude, and Gemini 4 Argon (5-hour and weekly windows) directly in the Settings panel.
• Reasoning Effort Control: Direct mapping for reasoning efforts (Low, Medium, High) across Gemini 4 Argon, Gemini 3.8 Flash, and Claude models.
• Local Credential Storage: Discovery is read-only. Tokens stay in <DSH_HOME>/storages/agy-next-oauth.json and are never uploaded.

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Requirements

1. DeepSeek Harness: 0.1.5 ~ 0.2.x (fully compatible with the latest 0.2.1 series), Node.js >=20.
2. Official Antigravity App: Installed locally on Windows or macOS (Linux support in progress). Download from the official portal. The application does not need to be running.
3. Google Account: With browser consent capability and access to Gemini / Cloud Code Assist models.

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Installation

Method 1: DSH UI (Recommended)

1. Open Plugins → + Add plugin in the DSH sidebar.
2. Enter the repository URL:

   https://github.com/kizaki-R/Antigravity-Next-for-DSH
   

   (Or enter agy-next once published to npm).
3. Select Install, then restart DSH.

Method 2: Local Developer Link (CLI)

For local development:

dsh plugin --profile <profile> add link:/absolute/path/to/agy-next

Make sure agy-next is in your profile's dsh.profile.bundles, then restart DSH.

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Getting Started

1. Account Setup

In DSH, open Settings → AGY-Next:

1. Check Status: Confirm DSH detects the local Antigravity installation path.
2. Add Account: Click Sign in / Add account. A browser window opens for standard Google OAuth consent.
3. Once authenticated, the account appears in the Account Pool with real-time quota bars.

CLI commands:

npm run login              # Sign in account
npm run login -- --status  # Check active account & quota
npm run login -- --force   # Force re-authentication
npm run login -- --logout  # Clear stored credentials

2. Custom Installation Path

If Antigravity is installed in a non-standard location, set the environment variable before starting DSH:

# PowerShell
$env:AGY_NEXT_INSTALL_PATH = 'C:\Custom\Path\To\Antigravity'

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Configuration

Custom parameters can be set in your profile's cordis.yml:

- id: agy-next
  name: agy-next
  config:
    credentialPath: ""               # Default: <DSH_HOME>/storages/agy-next-oauth.json
    streamIdleTimeoutMs: 300000      # Idle stream protection timeout (ms, default 5 mins)
    discoveryTimeoutMs: 8000         # Local client discovery timeout (ms)
    projectCacheTtlMs: 1800000       # Project metadata cache TTL (ms, 30 mins)
    runtimeModel: ""                 # Optional: pin a specific upstream model id

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Supported Models

Model Family	Key Models	Context Window	Key Capabilities
Gemini 4 Argon	gemini-4-argon	1M tokens	Low / Medium / High reasoning efforts, 5h & weekly quota telemetry
Gemini 3 / 2.5	gemini-3.8-flash, gemini-3-flash, gemini-2.5-pro, gemini-2.5-flash	1M tokens	High-speed multimodal streaming, tool calling
Claude	claude-sonnet-5-5, claude-opus-5-5, claude-opus-4-6, claude-sonnet-4-6	1M tokens	Deep integration with Cloud Code Assist Claude runtime
Open Source	gpt-oss-120b	128k tokens	High-parameter open-weights inference

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Development

Run offline tests inside agy-next/:

npm run check        # Syntax validation across all 40 modules
npm test             # Offline regression suite (21 fixture tests)
npm run test:peers   # Strict host peer contract test (requires AGY_PEER_ROOT)

To run peer contract tests, export the DSH runtime dependency path:

$env:AGY_PEER_ROOT = 'C:\path\to\dsh\node_modules'
npm run test:peers

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Security

• No Hardcoded Secrets: The repository contains no Google Client IDs or Client Secrets. Values are resolved dynamically at runtime from local application resources.
• Storage Isolation: Credentials are saved to agy-next-oauth.json under the DSH home directory. The official Antigravity app database is never read or modified.
• Tombstone Cleanup: Signing out writes an empty book with loggedOut: true to prevent automatic re-import from legacy configurations.

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License

MIT © Kizaki