slides

name	slides
description	Create, edit, inspect, or explain presentation slide decks (`.pptx`) with PptxGenJS, bundled layout helpers, and render/validation utilities. Use when tasks involve building a new PowerPoint deck, recreating slides from screenshots/PDFs/reference decks, modifying content while preserving editable output, extracting or explaining a specific slide, adding charts/diagrams/visuals, or diagnosing layout issues such as overflow, overlaps, and font substitution.
license	Apache-2.0 (see bundled LICENSE.txt)

Slides

Overview

Use PptxGenJS for slide authoring. Do not use python-pptx for deck generation unless the task is inspection-only; keep editable output in JavaScript and deliver both the .pptx and the source .js.

Keep work in a task-local directory. Only copy final artifacts to the requested destination after rendering and validation pass.

Bundled Resources

• assets/pptxgenjs_helpers/: Copy this folder into the deck workspace and import it locally instead of reimplementing helper logic.
• scripts/render_slides.py: Rasterize a .pptx or .pdf to per-slide PNGs.
• scripts/slides_test.py: Detect content that overflows the slide canvas.
• scripts/create_montage.py: Build a contact-sheet style montage of rendered slides.
• scripts/detect_font.py: Report missing or substituted fonts as LibreOffice resolves them.
• scripts/ensure_raster_image.py: Convert SVG/EMF/HEIC/PDF-like assets into PNGs for quick inspection.
• references/pptxgenjs-helpers.md: Load only when you need API details or dependency notes.

Workflow

1. Inspect the request and determine whether you are creating a new deck, recreating an existing deck, or editing one.
2. Set the slide size up front. Default to 16:9 (LAYOUT_WIDE) unless the source material clearly uses another aspect ratio.
3. Copy assets/pptxgenjs_helpers/ into the working directory and import the helpers from there.
4. Build the deck in JavaScript with an explicit theme font, stable spacing, and editable PowerPoint-native elements when practical.
5. Run the bundled scripts from this skill directory or copy the needed ones into the task workspace. Render the result with render_slides.py, review the PNGs, and fix layout issues before delivery.
6. Run slides_test.py for overflow checks when slide edges are tight or the deck is dense.
7. Deliver the .pptx, the authoring .js, and any generated assets that are required to rebuild the deck.

Authoring Rules

• Set theme fonts explicitly. Do not rely on PowerPoint defaults if typography matters.
• Use autoFontSize, calcTextBox, and related helpers to size text boxes; do not use PptxGenJS fit or autoFit.
• Use bullet options, not literal • characters.
• Use imageSizingCrop or imageSizingContain instead of PptxGenJS built-in image sizing.
• Use latexToSvgDataUri() for equations and codeToRuns() for syntax-highlighted code blocks.
• Prefer native PowerPoint charts for simple bar/line/pie/histogram style visuals so reviewers can edit them later.
• For charts or diagrams that PptxGenJS cannot express well, render SVG externally and place the SVG in the slide.
• Include both warnIfSlideHasOverlaps(slide, pptx) and warnIfSlideElementsOutOfBounds(slide, pptx) in the submitted JavaScript whenever you generate or substantially edit slides.
• Fix all unintentional overlap and out-of-bounds warnings before delivering. If an overlap is intentional, leave a short code comment near the relevant element.

Recreate Or Edit Existing Slides

• Render the source deck or reference PDF first so you can compare slide geometry visually.
• Match the original aspect ratio before rebuilding layout.
• Preserve editability where possible: text should stay text, and simple charts should stay native charts.
• If a reference slide uses raster artwork, use ensure_raster_image.py to generate debug PNGs from vector or odd image formats before placing them.

Inspection-Only Requests

Use inspection-only mode when the user asks to explain, summarize, translate, or review a specific slide without asking for edits.

• Do not modify the deck.
• If the deck is not named and multiple plausible .pptx files exist, inspect the most likely local candidates and say which one you used. Ask for clarification only when the choice remains materially ambiguous.
• For a request such as "slide 17, explain the last sentence", extract the actual slide text from the .pptx package instead of relying on memory or filenames.
• Report whether the requested slide number exists. If it does not, name the deck and slide count.
• Keep the answer anchored to the exact sentence or phrase being explained, then explain it in the user's language.
• Use python-pptx or direct OOXML/ZIP inspection only for read-only extraction. Do not use python-pptx to generate replacement decks.

Validation Commands

Examples below assume you copied the needed scripts into the working directory. If not, invoke the same script paths relative to this skill folder.

# Render slides to PNGs for review
python3 scripts/render_slides.py deck.pptx --output_dir rendered

# Build a montage for quick scanning
python3 scripts/create_montage.py --input_dir rendered --output_file montage.png

# Check for overflow beyond the original slide canvas
python3 scripts/slides_test.py deck.pptx

# Detect missing or substituted fonts
python3 scripts/detect_font.py deck.pptx --json

Load references/pptxgenjs-helpers.md if you need the helper API summary or dependency details.