Developers increasingly rely on AI-generated slides to turn documents into presentations, but a hidden flaw often surfaces: portions of content are silently and substantially cropped. The author noticed that slides appear correct during editing, yet the overflow only emerges after export or, worse, during the live talk, jeopardizing credibility.

Slide layouts depend on screen size, font rendering, code block wrapping and export targets, making tiny misalignments easy to overlook. When generation is fully automated, no obvious “something looks wrong” cue appears, so both humans and scripts miss the problem. Detecting the issue early, not fixing it, became the real challenge.

To surface the hidden bug, the author released a small CLI tool that scans Slidev presentations for layout overflow. The heuristic‑based overflow checker isn’t perfect, but it flags problems early enough for inclusion in CI pipelines or other automated workflows. Making failures visible may prove more valuable than improving generation quality.