Verification

A cross-DCC, read-only verification toolset (affinity: any) that closes the capture-and-look quality loop with deterministic, machine-checkable signals. Inspired by img2threejs's "deterministic-first, model-last" review design, it computes evidence in-band — statistics, hashes, and verdicts — and never ships pixels to a model unless a caller explicitly asks for image/both payloads.

The four tools map to the four legs of the deterministic capture contract:

• capture_review_views — the fixed front / side / top / three-quarter view plan, viewport-only, fails loudly on a missing, wrong-size, or blank frame.
• image_stats — mean luma, stddev, histogram, uniformity, and bad-frame flags (white playblast, near-black render, missing display transform).
• validate_scene_vs_spec — hierarchy names, material bindings, per-mesh UV coverage, part existence, non-manifold, and Euler checks, before export.
• make_comparison_sheet — reference + renders side-by-side into one image; packages evidence and computes no scores.

Pixel-level metrics (pHash / dHash / aHash, silhouette IoU, SSIM, CIEDE2000, Sobel edge maps) live in dcc_mcp_core.verification as deterministic library functions, not skill tools, so callers gate on them directly.

Safety Contract

Every tool is read-only and side-effect free except make_comparison_sheet, which writes exactly one output image at the requested path. Tools never mutate the input captures and never launch a DCC. PPM/PGM inputs decode through the standard library; other formats (PNG/JPEG/EXR) decode through ffmpeg on PATH (or vx ffmpeg) and fail loudly when the decoder is unavailable.