wshobson/pptx-reference-deck-analysis

PPTX Reference Deck Analysis

Inspect a reference deck as design evidence. This skill never copies, clones, or mutates a source deck.

Contract

Implement required extraction on demand with a small task-local python-pptx script. Capture only the information required for the new deck:

• compact prompt context: slide count and size, text summaries, shape counts, styles, brand signals, template use, and layout rhythm;
• full extraction: summary, slides, and read-only layout_tree evidence;
• folder diagnostics: one result per deck plus a manifest;
• style-master analysis: colors, fonts, size distribution, master/layout use, and flow patterns;
• derived template catalog: zero-based source indices, layout roles, usable regions, placeholders, visual structures, and constraints.

Rules

• Keep the source deck read-only and independently author every target-slide coordinate.
• Use the bundled OOXML utilities only for raw themes, relationships, notes, comments, animations, media, masters, or layouts that high-level extraction cannot expose.
• Record inspected parts and parsing exceptions in the analysis manifest.
• Do not use extracted content, fonts, images, or proprietary assets in a generated deck without explicit permission and license evidence.

OOXML package inspection

Install defusedxml from requirements.txt before using the bundled utilities.

1. Run scripts/inspect.py <deck.pptx> for a compact JSON report of slide order, text, theme tokens, relationships, notes, comments, animations, and media.
2. Run scripts/validate_package.py <deck.pptx> --output <report.json> for malformed XML, broken internal relationships, content-type gaps, duplicate layout links, and orphaned parts.
3. Run scripts/unpack.py <deck.pptx> <output-dir> only when raw-package evidence is necessary.
4. Resolve relationship targets relative to the .rels owner; never infer slide order from filenames.

Safety

• Never modify a supplied deck or blindly copy package parts into a new deck.
• Run the scripts from a trusted workspace; they reject path traversal, symlinks, oversized members, and archive bombs.
• Parse untrusted XML with defusedxml; do not enable entity expansion, DTD loading, or network access.
• Treat theme colors as tokens unless fully resolved against the color scheme.

See references/reference-deck-analysis.md for output shapes, references/reference-deck-analysis-patterns.md for documentation-only patterns, and references/ooxml-parsing.md for package part maps.