google-vertex · tool-assisted

gemini-3.8-flash-high

Harness: Antigravity CLI
Version: 1.3.3
Effort: high

Rendered output

Preview is stopped. Starting it executes generated code.

Screenshot of gemini-3.8-flash-high output

Preview safety and restrictions

Restricted preview policy restricted-html-v1. A blank result is not an automatic pass or failure. Restrictions may affect the output.

Generated scripts can consume CPU or navigate their own frame. Curator review is required. Stop cannot reliably recover a blocked browser.

Curator's read

What stands out

A detailed read of this attempt's approach, distinctive choices, and lessons for future runs.

The agent began with an SVG concept and then pivoted to a detailed Canvas implementation.
The final 1,613-line HTML artifact contains a synthwave scene with a capybara, hoverboard effects, particles, city scenery, responsive sizing, and keyboard, pointer, and button controls.
The agent iteratively rendered screenshots, reviewed visual changes, checked the DOM, validated JavaScript syntax, and removed temporary test files.
The response is self-contained and contains no external libraries, image assets, font imports, network calls, or audio references.
The artifact uses Math.random for scene and particle generation, so some visual details vary between reloads.
The recorded token usage is 3,163,198 total tokens, including 2,811,068 cached tokens; model time is unavailable because assistant duration measurements were not present.

Inspect the evidence

Challenge and protocol ↗

The curator reports this collected series is fully published.

Exact user instructions

User turn 1

Build an animated capybara riding a hoverboard using only HTML, CSS, and JavaScript.

Deliver a single self-contained HTML file with all CSS and JavaScript inline. Do not use external libraries, external image assets, external fonts, or network requests. Inline SVG, CSS drawing, and canvas are allowed.

The result should visibly show a capybara riding a hoverboard, with animation that makes the scene feel alive. Do not include audio.

Return only the HTML source, without explanations or Markdown code fences.

Full recorded transcript

Run provenance

Run ID: agy-9716c6ed-b142-495a-9a4d-234569ea329e-capybara-hoverboard-v1
Provider: google-vertex
Model identifier: gemini-3.8-flash-high
Identifier kind: unknown
Generated: 2026-10-12T11:41:50Z
Published: 2026-10-12T13:08:21Z
Generation mode: tool-assisted
Interface: coding-agent
Tools used: yes
Challenge: capybara-hoverboard-v1
Series: agy-series-9716c6ed-b142-495a-9a4d-234569ea329e
Attempt: 1

Open recorded run metadata

Capture conditions

{
  "path": "thumbnails/agy-9716c6ed-b142-495a-9a4d-234569ea329e-capybara-hoverboard-v1.png",
  "viewport": {
    "width": 640,
    "height": 480
  },
  "capture_delay_ms": 1000,
  "browser_version": "156.0.8078.4",
  "preview_policy_version": "restricted-html-v1"
}

The curator's read above contains observations, not scores. Null capture metadata means unknown.

Original response

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Extracted HTML

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