dsh-tool-antigravity

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High-performance, streamlined Antigravity capability bundle plugin for DeepSeek Harness (DSH).

Provides private Google OAuth 2.0 PKCE authentication, multi-model LLM routing (google-antigravity), session-persistent Nano Banana 2 image generation and editing (generate_image, list_images), and an interactive Web settings panel with live quota visualization.

Highlights in v0.4.1 (Tool-Call ID Recovery, Network Resiliency & Thought Signature Hardening)

• Provider Tool-Call ID Reuse Recovery: Eliminates fatal INVALID_ARGS session lockouts in long turns by tracking provider tool-call states, deterministically suffixing conflicting IDs (${id}#${name}), FIFO result pairing, and assistant-turn unfulfilled call expiry.
• Resilient Network Retry & Contract Alignment: Retries transient network interruptions and 502/503/504 status codes up to 3 times with exponential backoff (1s / 2s / 4s) before byte emission, mapping transport errors to the standard TRANSPORT code adhering to DSH Host retry contract.
• Universal Thought Signature Enforcement: Resolves private endpoint 400 INVALID_ARGUMENT rejections by ensuring all Gemini/non-Claude and initial Claude functionCall parts carry valid thought signatures or the SKIP_THOUGHT_SIGNATURE sentinel.
• Retains v0.4.0 capabilities: Core tools prioritization (up to 384 tools), schema enum sanitization, response.error error semantics, and multi-agent image offloading.

Features

1. High-Performance Core Architecture

• TLS Connection Pooling & Session Resumption: Built-in HTTP/1.1 Keep-Alive socket pool and TLS session resumption against Google endpoints, eliminating repeated TLS handshake roundtrips and significantly reducing Time-To-First-Token (TTFT).
• Sliding-Window Buffer SSE Parser: High-throughput binary chunking directly locates newline separators on raw Buffers, bypassing heavy string concatenations and drastically reducing V8 heap allocations and GC spikes during long reasoning chains.
• Granular Thinking Budgets: Fine-grained reasoning effort configuration (low, medium, high) across Gemini and Claude models with graceful fallbacks.
• Pre-flight Idempotent Retry: Automatically retries transient network interruptions (e.g. TLS RST / 502 / 503 / 504) up to 3 times with exponential backoff prior to first byte emission.
• Windows File Lock Recovery: Active PID probing (process.kill(pid, 0)) detects stale locks from crashed processes and immediately frees them, preventing 30-second hang timeouts.
• Stale-While-Revalidate (SWR) Quota Resilience: Robust quota normalization supporting 5h and weekly windows; retains and displays last-known valid quota with smooth shimmer animations during transient network disruptions.

2. Supported Models (google-antigravity)

| Model Identifier | Display Name | Capabilities | Thinking Budget | | :--- | :--- | :--- | :--- | | antigravity-gemini-3.8-flash | Gemini 3.8 Flash | Text, Vision, Tools | Low / Medium / High | | antigravity-gemini-3.7-flash | Gemini 3.7 Flash | Text, Vision, Tools | Low / Medium / High | | antigravity-gemini-3.6-flash | Gemini 3.6 Flash | Text, Vision, Tools | Default | | antigravity-gemini-3.1-pro | Gemini 3.1 Pro | Text, Vision, Tools | Low / High | | claude-sonnet-4-6-thinking | Claude Sonnet 4.6 | Text, Vision, Tools | Dynamic Reasoning | | claude-opus-4-6-thinking | Claude Opus 4.6 | Text, Vision, Tools | Dynamic Reasoning | | gpt-oss-120b-medium | GPT-OSS 120B | Text, Tools | Fixed Effort |

3. Nano Banana 2 Image Generation & Multi-Turn Editing

• generate_image: Prompt-based image creation and iterative image-to-image editing powered by Nano Banana 2 (gemini-3.1-flash-image) using session references.
• list_images: Inspect and retrieve generated image attachments within the current session.
• Fully integrated with DSH AttachmentStore and FileSystem with TOCTOU path escape protection without polluting chat context with raw base64 payloads.

Installation

Via DSH Plugin CLI (Recommended)

# Add directly to your active DSH web profile
dsh plugin --profile web add dsh-tool-antigravity

Via npm / pnpm

# Using npm
npm install dsh-tool-antigravity

# Using pnpm
pnpm add dsh-tool-antigravity

Cordis Plugin Configuration

Add the plugin entries to your cordis.patch.yml or DSH config file:

- id: antigravity-auth
  name: 'dsh-tool-antigravity'

- id: antigravity-image
  name: 'dsh-tool-antigravity/image'

Usage & Commands

Slash Commands

Manage authentication directly from the DSH terminal / chat prompt:

• /antigravity-auth login: Initiates Google OAuth 2.0 PKCE login and launches your default browser.
• /antigravity-auth status: Check current authentication state, masked email, and project id.
• /antigravity-auth logout: Discard credentials and revoke tokens.
• /antigravity-auth cancel: Abort an ongoing login attempt.

UI Settings & Dashboard

Once loaded in the DSH Web client:

• Antigravity Auth Settings Card: View live login status, account identifier, and toggle capabilities.
• Quota Visualizer: Real-time remaining quota percentages and countdowns for 5-hour and weekly reset windows.
• Image Generation Card: Configure default image models and batch size.

Security & Invariants

1. Credential Isolation: Access and refresh tokens are strictly held in host-side secure stores and are never forwarded to the frontend UI, logs, or command done events.
2. Strict Loopback Guard: Account RPC endpoints fail-closed (loopback-required) unless the web service is explicitly bound to 127.0.0.1.
3. Immutable Wire Identity: Emits verified AGY CLI headers (antigravity/cli/1.1.24) and attribution metadata.
4. Media Path Containment: All file references are verified against directory traversal and symlink escapes.

Disclaimer

This project is an unofficial, community-driven capability bundle intended strictly for personal research, educational purposes, and independent development. Please adhere to relevant platform Terms of Service.

License

MIT © dsh-tool-antigravity contributors