chrome-verification

name	chrome-verification
plugin	garden-structure-designer
description	Runs a headless Chromium browser via Playwright to render generated SVGs, perform pixel-level heuristics (edge density, bounding box fill), and verify visual correctness against baselines.
version	1.3.2
allowed-tools	read_file, write_file, run_command
tags	["verification","playwright","chromium","visual-smoke-test"]
metadata	{"garden_structure_designer":{"category":"validation","consumes":["outputs/*.svg","context/staging/structure.json"],"produces":["context/staging/visual-smoke-report.json","outputs/visual-smoke-report.md","outputs/visual-smoke/*.png"],"validators":["plugins/garden-structure-designer/scripts/visual_svg_smoke_test.py"]}}

Chrome Visual Verification Skill

This skill governs the visual validation of all generated construction drawings and blueprints using headless Chromium via Playwright. It ensures that the generated vector outputs are visually correct, not empty or placeholder-quality, and contain all required structural elements without visual regressions.

Required Behavior

1. Verify Browser Environment: Launch Playwright with standard sync API in headless mode. If local rendering is blocked, fail-closed with BROWSER_RENDER_BLOCKED.
2. Render Vectors to Raster: Navigate to each SVG generated in outputs/ and take a high-resolution screenshot (PNG) inside a 1600x1200 viewport.
3. Run Perceptual & Raster Heuristics:
   • Non-Background Ratio: Ensure non-background pixels exceed a minimum ratio (e.g. 0.020 for blueprints, 0.015 for drawings) to detect blank or mostly-empty sheets.
   • Bounding Box Fill Ratio: Ensure the structure fills the bounding box adequately.
   • Spaghetti Hub / Density Check: Crop the hub junction area and measure edge pixel density. Reject drawings where rafters overlap into a dense visual blob (density > max allowed).
   • Top-Left Clutter: Verify the model is centered and not squashed in the top-left corner.
4. Compile Reports: Write the final visual-smoke-report.json to context/staging/ and visual-smoke-report.md to outputs/.

Authoritative Verification Command

Execute the visual smoke test using the dedicated Playwright runner:

python3 plugins/garden-structure-designer/scripts/visual_svg_smoke_test.py \
  --structure context/staging/structure.json \
  --svg-dir outputs \
  --out-dir outputs/visual-smoke \
  --report-json context/staging/visual-smoke-report.json \
  --report-md outputs/visual-smoke-report.md \
  --fail-on-regression

Obstacle Gating

If the Chrome-based verification returns FAIL or may_claim_success: false, the orchestrator must reject the design package. Common visual failure classifications include:

• BROWSER_RENDER_BLOCKED: Silent Playwright or display server failure.
• SPAGHETTI_HUB: Rafters overlap or penetrate the center hub, resulting in high pixel density.
• BLANK_SHEET: Drawing failed to render any elements (low non-background ratio).
• CLUTTERED_CORNER: Perspective or scale issues pushing elements to the viewport boundary.