presentations

# Presentations Read `${SKILL_DIR}/../_shared/artifacts.md`. Use `python-pptx` for portable PPTX authoring. It is a different engine from OpenAI's private artifact-tool runtime; do not execute that runtime's examples as if the APIs were interchangeable. 1. Define the audience, decision, story, slide count, and source material. Write an outline with one main claim per slide, supported by actual evidence. 2. Inspect any existing deck's slide size, masters, layouts, fonts, objects, notes, charts, and embedded resources. Work on a copy. Retain native editable text, shapes, tables, and charts rather than rasterizing entire slides. 3. Build a consistent grid, title hierarchy, restrained palette, and readable type scale. Keep all objects within the slide. Prefer charts and diagrams when they explain a comparison or relationship; label axes and cite data. 4. For edits, change the requested objects while preserving unrelated content. Inspect effective typography at both paragraph-default and run levels; a run's unset font properties can inherit the reference's font, size, and color from its paragraph or theme. Prefer replacing text within existing runs. Assigning `shape.text` or clearing a text frame can discard paragraph defaults and silently flatten the hierarchy. If rebuilding is necessary, retain and restore paragraph properties (`a:pPr`) and run properties (`a:rPr`), including alignment, spacing, bullets, and color, then compare effective fonts against the reference after saving. Do not treat an unset run font as unformatted text. Do not rebuild a complex deck through a library that cannot preserve its animations, media, SmartArt, or chart behavior; use a capable native adapter or report the specific limitation before destructive conversion. 5. Reopen the PPTX to verify slide count, text, notes, chart data, typography, and object bounds. Render every slide, inspect full-size images, fix overlap and clipping, and render affected slides again. XML bounds alone do not catch text overflow. 6. Return the PPTX, plus a PDF only when requested. A Google Slides request needs a verified connector import; a local deck alone does not complete that step.