Add codex-ppt skill

[ningzimu]

Summary

This PR adds codex-ppt as an external Codex skill in the Productivity & Collaboration section.

codex-ppt turns articles, reports, papers, course notes, and outlines into visually unified PPTX decks. It uses Codex's image generation workflow to create each slide as a full 16:9 image, then assembles those slide images into a PowerPoint file with a local script.

What the skill does

• Plans a deck outline from source material before slide generation.
• Guides Codex through style selection, including built-in reference styles such as clean professional, scientific defense, e-ink magazine, hand-drawn technical explainer, and dashboard.
• Generates one approved sample slide before producing the full deck.
• Creates one full-slide image per page with consistent visual language and varied layouts.
• Produces supporting outline.md and speech.md files.
• Assembles slide_01.png, slide_02.png, and other generated images into a .pptx file via scripts/assemble_ppt.py.

Why it is designed specifically for Codex

• The skill is structured around Codex's skill trigger model with precise SKILL.md frontmatter and progressive disclosure through references/.
• The workflow explicitly uses Codex's built-in gpt-image-2 image generation and editing capability for slide creation instead of treating Codex as a generic text prompt generator.
• It gives Codex operational steps for a full production loop: source understanding, outline planning, style confirmation, sample approval, batch image generation, visual QA, speaker-note generation, and local PPT assembly.
• It includes deterministic local tooling for the final assembly step, so Codex handles creative generation while the repeatable packaging step stays script-driven.

Core advantages

• High visual consistency: every slide follows a unified style system rather than isolated one-off prompts.
• Strong presentation quality: the image-based workflow prioritizes finished visual composition over editable but plain PowerPoint objects.
• Reusable style library: reference files provide concrete visual directions while keeping the main skill body lean.
• Practical output: users receive a real .pptx, ordered slide images, an outline, and speaker notes.
• Clear installation path: the skill lives under skills/codex-ppt, so it can be installed with the standard install-skill-from-github.py command.

Why it fits this list

This repository curates practical, reusable Codex skills. codex-ppt is not a single prompt or demo; it is a complete skill package with a standard SKILL.md, reference documents, requirements, and a local assembly script. It also complements existing document-generation entries such as paperjsx: paperjsx focuses on structured JSON-to-document generation, while codex-ppt focuses on visually rich, image-based presentation decks generated through Codex's native workflow.

Validation

• Verified the install command works against ningzimu/codex-ppt-skill with a temporary destination.
• Confirmed the installed skill contains SKILL.md, requirements.txt, scripts/assemble_ppt.py, and style reference files.