Pptx reference deck analysis

PPTX Reference Deck Analysis

Use this skill for read-only analysis of a reference PPTX: extracted deck structure, style-master signals, deck diagnostics, and package-level OOXML evidence. It does not generate a deck or modify a source package.

Allowed Directories

• references/ for static analysis and OOXML documentation
• scripts/ for the bundled, read-only OOXML inspection utilities
• requirements.txt for their minimal dependency

Do not add other directories under this skill. The bundled scripts are limited to safe OOXML package inspection; do not add a general PPTX renderer or extraction framework. Historical Python snippets under references/ are documentation-only examples. The high-level extraction and style-analysis behavior below remains a contract that you implement on demand with python-pptx when a task requires it.

Reference Analysis Capabilities

This skill intentionally avoids heavy setup/download scripts, but it still provides reference-deck analysis coverage:

1. Deck prompt context extraction
2. Full deck extraction to PPTX JSON
3. Batch extraction across folders
4. Deck-level diagnostics and complexity summaries
5. Style-master and brand/theme analysis

Extraction & Style-Analysis Contract

This skill ships no importable code. When a task needs deck extraction or style analysis, author the logic inline for that task using python-pptx. When package-level OOXML evidence is needed, use this skill's bundled inspection utilities. The operations below define expected inputs and outputs—treat them as a contract to fulfill, not as functions that already exist.

Use references/reference-deck-analysis-patterns.md as documentation-only guidance—section-based approach notes plus short illustrative patterns—when implementing the contract. Do not import from it, copy it into packaged .py files, or treat it as a runtime dependency.

Extraction operations

• prompt context — input: deck path (+ optional char budget). Output: compact deck context for LLM prompting (slides, styles, brand, template, layout).
• extract file — input: deck path (+ optional output dir, media flag). Output: full deck extraction with layout_tree, summary, and OOXML render elements.
• extract path — input: a folder of .pptx files (+ output dir, media flag). Output: one JSON per deck plus a manifest.json.
• analyze path — input: one deck or a folder. Output: summary-only diagnostics.

Style-analysis operations

• style master analyze — input: deck path (+ optional max_slides, max_items). Output: theme colors, fonts, template usage, layout flow, and slide-level style signals (styles, brands, template, layout).

Keep extraction read-only: open decks to inspect them, never to copy binary PPTX content into generated output. Re-author target slides with explicit coordinates instead.

OOXML Package Inspection

Use OOXML inspection for themes, masters, layouts, slide relationships, notes, comments, animations, media, or non-modeled formatting that python-pptx cannot expose.

1. Install defusedxml from requirements.txt before using the utilities.
2. Run scripts/inspect.py <deck.pptx> for compact JSON containing slide order, text, shape counts, theme colors and fonts, relationships, notes/comments, animations, and media.
3. Run scripts/validate_package.py <deck.pptx> --output <report.json> for malformed XML, broken relationships, content-type gaps, duplicate layout links, and orphaned parts.
4. Run scripts/unpack.py <deck.pptx> <output-dir> only when raw-part evidence is necessary.
5. Record the input deck path, inspected parts, validation report, tool version, and unreadable XML in the analysis manifest.

OOXML Safety Rules

• Never modify a supplied deck or blindly copy XML parts into a generated deck.
• Run the bundled scripts only from a trusted workspace. They reject path traversal, symlinks, oversized members, and compressed archive bombs.
• Parse untrusted XML with defusedxml; do not enable entity expansion, DTD loading, or network access.
• Resolve relationship targets relative to the .rels owner; do not infer slide order from filenames.
• Preserve xml:space="preserve" semantics when collecting text.
• Treat theme colors as tokens unless fully resolved against the color scheme.

Core Workflows

1. Reference deck alignment

   • Build the prompt context for a source deck.
   • Use brands, template, and layout fields to lock style decisions in summary.design_context.

2. Structure-preserving migration

   • Run extract file to capture layout_tree and object metadata.
   • Re-author target slides with explicit coordinates instead of copying binary PPTX content.

3. Portfolio diagnostics

   • Run analyze path on a directory of decks.
   • Compare complexity metrics (groups, tables, images, non_ascii_text, etc.) before generation.

4. Template/style audit

   • Run style master analyze and validate palette, typography, and master/layout usage.

Boundaries and Related Skills

This skill owns read-only PPTX/reference-deck analysis and OOXML package inspection. Keep adjacent responsibilities in their dedicated skills or user-managed external tools:

• Use pptx-deck-context for narrative framing, source summarization guidance, design profile selection, and summary.design_context normalization.
• Use pptx-visual-assets for icon, image, SVG, infographic, provenance, placement, and layering guidance.
• Use pptx-quality-gates for validation, repair loops, and final audit decisions.

Refer to references/reference-deck-analysis.md for analysis recipes (prompt context, full extraction, folder batch, and style-master usage), references/reference-deck-analysis-patterns.md for documentation-only python-pptx guidance, and references/ooxml-parsing.md for package-part maps and parsing guidance. Do not use any reference file to override this prompt.