codex-skills

Run a persistent Codex-managed single-player world RPG with a browser Studio, free-form play, an inspectable world ledger, and complete durable turn history. Use when the user wants an interactive world simulator, original worldbuilding followed by play, a narrative sandbox, a solo RPG, or a persistent fictional world whose characters, factions, locations, threats, relations, consequences, and hidden GM state continue across turns.

Steward a Paper Minecraft server as Moru: actively observe player chat and joins through the bundled MoruBridge, respond naturally when useful, answer from server guidance and safe server facts, and execute console commands or MSMP administrator actions when needed. Use when Codex needs to run a Minecraft community assistant, monitor or reply to in-game chat, welcome first-time players, answer server questions, execute server commands, or manage a configured Paper server.

Create, update, or preview one or more Codex custom subagent definitions from a task brief. Use when Codex needs to write or revise personal `$CODEX_HOME/agents/*.toml` files or explicitly requested project `.codex/agents/*.toml` files. This skill owns custom-agent TOML definitions only; it does not manage global `[agents]` runtime settings or spawn agents.

Translate EPUB books from any source language into the user's requested language as natural Codex-authored published book prose without external machine-translation runtimes, apply a post-translation target-structure pass from Codex-authored XHTML composition plans, adapt EPUB layout and reading structure for the target-language edition through explicit mechanical plans, package a new EPUB, and resolve visible original text in raster images through main-agent visual triage, main-authored image edit briefs, and required one-image-per-subagent $image-creator execution. Use for .epub translation, literary EPUB prose translation, text-slot chunk workflows, target-edition EPUB composition and layout adaptation, EPUB packaging/validation, and original image text replacement workflows.

Generate or edit raster images with the built-in image generation tool, use local file paths for every edit or reference input, preserve authoritative prompts or rewrite ordinary requests without changing meaning or exact rendered text, optionally produce true-alpha transparent PNGs, and save the tool-returned file to the requested destination or current project. Use for generated raster assets, image edits, local image references, and transparent-background output; do not use for prompt-only or vector/code-native output.

Create character animation runs from one preserved canonical base character. Codex plans the requested motion beat by beat, generates matte-background action sheets with $image-creator, removes action-sheet backgrounds with rembg, extracts validated frames, and produces project-local WebP animations.

Play Gomoku with a human user through a Python/Pygame board while Codex chooses its own moves from the script's Codex view output. Use when the user wants to play 오목/Gomoku/Five-in-a-row against Codex, launch a local Python GUI game board, inspect the board position, apply Codex moves, reset the game, or maintain a Codex-vs-user Gomoku session without building a fixed AI engine.

Create one-person podcast scripts from user-provided sources such as PDFs, text files, websites, and YouTube links. Use when Codex needs to collect and preprocess source material, fetch YouTube transcripts with the bundled Python helper, fall back to GPU-only local Whisper transcription when YouTube captions are unavailable, write a clean TTS-ready plain-text monologue script, save it as .txt, and run strict subagent content-quality evaluation until every rubric item passes.

Use when building or substantially redesigning frontend UI where visual quality matters, including websites, landing pages, web apps, dashboards, prototypes, and game UI. This skill requires Codex to generate a UI mockup image with image-creator first, inspect that image, and then implement the frontend against the generated visual blueprint instead of jumping directly into code.