DSH Game Studio

Describe a small game in one sentence — play it in the sidebar of a DeepSeek Harness conversation, swap in AI art, export one HTML file.
_{10 agent tools • live sidebar preview • 2D and 3D voxel templates • OpenAI or Codex art with a cost check first • self-playing playtests • version history • one-file export}

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_{Package: @zseven-w/dsh-game-studio · Current plugin release: 0.1.0-rc.1 · Tested with DSH 0.2.1-rc.5}

_{The game plays in the right sidebar while the agent works; numbered AI art candidates wait under it for you to pick}

Why DSH Game Studio

Ask the agent for a game in plain words — "a 3D game: a red panda collects bamboo shoots in a forest and dodges wild boars" — and it builds one from a template, plays it to check it works, and shows it in a sidebar you can play right away. Characters start as code-drawn models; when you want real art, the agent generates candidates with OpenAI or your Codex sign-in, you pick one by number, and the game swaps it in. Every change is a version you can go back to, and the finished game exports as a single offline HTML file.

🎮 Playable from the first answer	Two templates — a 2D top-down game and the same loop in a 3D voxel world (three.js) — that the agent reshapes into the game you described: characters, rules, levels, screens.
🖥️ Live sidebar preview	The game runs in a sandboxed panel next to the conversation, rebuilds on every change, and lists the art slots, candidates and versions under it. Landscape games get a wide stage.
🎨 Your own art, with a cost check first	game_studio_generate_asset makes numbered candidates per slot with the OpenAI image API or the local Codex CLI. Before anything is spent you get an approval card with the service, image count and expected cost. A picture you attach in chat can be the reference.
🤖 Self-playing playtests	game_studio_playtest plays the latest code in a headless Chrome or Edge and reports phases, score, frame rate, script errors and screenshots. Games that are not steered with arrow keys (grids, cards, aiming, rhythm…) define window.__autoplay, so the playtest plays their real loop.
🕰️ Version history	Every build that changed the game is saved; game_studio_restore_version brings back code, rules and art together.
📦 One-file export	game_studio_export writes a self-contained HTML file with no network access — open it in any browser or put it on any static host.
📱 Try it on your phone	game_studio_share opens a temporary read-only link on your local network, with a QR code in the sidebar.
🗂️ My games	Open the sidebar's + and pick Game Studio · My games: every game in the workspace as a card with its latest playtest picture. Click one to play it — no agent, no tokens.

Games made with it

Four games from our test runs. Each started from the one sentence under it, in a fresh session (prompts translated from Chinese); later requests in the same session tweaked some of them, as noted. Gameplay is recorded with each game's own autoplay.

_{Moonlit Fox: Lantern Isle — 3D voxel template, live gameplay}

“Make a small game: a little fox collects lanterns in a moonlit forest and dodges thorn monsters.” 2D template; characters later swapped for picked AI art	“Make a 3D game: a little fox collects lanterns on a voxel island and dodges thorn monsters.” 3D voxel template; the lantern model was redone in a later request
“Make a 3D game: a little penguin collects fish on an iceberg and dodges seals.” 3D; a later request added the red hat	“Make a 3D game: a red panda collects bamboo shoots in a bamboo forest and dodges wild boars.” 3D; characters later swapped for AI art, the forest stays 3D

How well it works

Measured in a real DSH with DeepSeek-V4.1-Flash, each game made from one sentence in a fresh session, scored by an independent playtest (2026-11-04/05):

• Collect-and-dodge games (the templates' home ground): 10 of 10 different requests were playable on the first try, median about 14 minutes per game.
• Other genres — match-3, box pushing, tower defense, basketball, platformer, rhythm, racing, card battle, farming, café management: all 10 came out playable, but took a median of about 26 minutes. After adding __autoplay, custom art slots and landscape support, four of them were rerun and took 8–18 minutes. The sample is small.

Tools

Tool	What it does
game_studio_create	Create a playable game from the collector (2D) or voxel (3D) template, build it and show it in the sidebar. Takes the title, an art style, orientation (portrait or landscape) and slots — the game's own art slots, named in the user's language.
game_studio_build	Rebuild after editing game.json or game.js, refresh the preview and save a version with a short note.
game_studio_playtest	Play the latest code headlessly (phone-shaped portrait or 960×540 landscape) and report phases, best score, hearts, fps, errors and screenshots; characters: true returns close-ups of the characters only.
game_studio_generate_asset	Generate 1–4 candidate images for one slot with openai or codex, optionally following a reference picture. Asks for approval before spending. Codex runs in the background.
game_studio_apply_asset	Put a candidate into the game by its number, rebuild and refresh.
game_studio_revert_asset	Go back to a slot's previous art.
game_studio_versions	List saved versions, newest first.
game_studio_restore_version	Restore an earlier version of the whole game.
game_studio_export	Export one self-contained, offline HTML file.
game_studio_share	Open (or close) a temporary read-only link on the local network so a phone can play the game.

The sidebar's buttons (apply, revert, build, export, restore, share) call the same operations through the /game-studio command.

Image services and spending

Service	What it needs	Cost	Notes
OpenAI (GPT Image)	An API key in DSH credentials or the environment (OPENAI_API_KEY by default)	Billed per image to your key; the approval card shows an estimate	About a minute per batch. openaiBaseUrl accepts an OpenAI-compatible gateway.
Codex CLI	Codex installed and signed in (codex login)	Counts against your Codex plan; no API key	Several minutes per image, runs in the background and reports back when done.

imageProvider: auto (the default) uses OpenAI when its key is set and Codex otherwise. With confirmSpending on (the default) nothing is generated until you approve the card. Sprites are checked for a transparent background and framing and fitted to the slot before they are offered.

Security and privacy

• Games run in a sandboxed iframe with a content security policy that blocks network access; exported files make no network requests.
• The only things sent off your machine are the prompts — and the reference picture, if you give one — to the image service you choose.
• The share link is read-only, serves just that game's build, listens on your local network only and closes after the time you set (30 minutes by default).
• API keys are read from DSH credentials or the environment and are never written into projects, logs or tool results.

Requirements

• DeepSeek Harness 0.2.1 or later (web or desktop), Node.js 24.11 or later.
• Google Chrome or Microsoft Edge on the same computer for playtests.
• For AI art, either an OpenAI API key or the Codex CLI signed in. Without either, games still work with their code-drawn characters.

Install into DSH

Install from npm into a DSH profile:

dsh plugin --profile web add @zseven-w/dsh-game-studio@latest
dsh web

Quick start

Open a session in a workspace folder and ask, for example:

• Make a small game: a kitten steals dried fish in a kitchen without bumping into the robot vacuum.
• Make a 3D game: a little knight collects coins in a castle and avoids skeletons; collecting 20 coins in 60 seconds wins.
• Make a match-3 game on a 6×6 grid; reach 1000 points in 60 seconds to win.

Then try:

• Generate 2 new pieces of art for the hero with AI; I'll pick in the sidebar.
• Follow the picture I attached for the hero's look.
• Export it as a single HTML file.

Configuration

Set these under config in your profile's cordis.patch.yml:

Option	Default	Meaning
imageProvider	auto	auto, openai or codex.
openaiModel	gpt-image-2.5-flare	OpenAI image model; pin it so results stay comparable.
openaiBaseUrl	OpenAI	OpenAI-compatible base URL, e.g. a company gateway.
openaiCredential	OPENAI_API_KEY	Name of the credential or environment variable holding the key.
codexPath	found on PATH or through the login shell	Codex CLI executable.
codexModel	Codex's default	Model for Codex image runs.
codexReasoningEffort	low	Reasoning effort for Codex image runs.
codexTimeoutMinutes	15	Give up on one Codex image after this long.
confirmSpending	true	Ask for approval before every generation.

Game project format

Each game is a plain folder in your workspace:

• game.json — title, art style, orientation, art slots and rules. Rules are free-form: any key is passed to the game as window.GAME.rules.
• game.js — the game code the agent edits. It exposes window.__gameState() for playtests, optionally window.__autoplay(state) for games not steered with arrow keys, and window.__renderSlots(size) so the sidebar shows characters drawn in code (the 2D template draws them in drawCharacter()).
• assets/ — the picture for each slot plus ASSETS.json, the record of where each one came from. You can draw over a slot's file directly; the studio records it as your edit.
• dist/index.html — the current build; .studio/ holds versions, candidates and playtest runs.

Development

npm ci
npm run build   # lib/index.js, lib/client.js and the bundled three.js runtime
npm test        # node --test; playtest tests are skipped when no Chrome or Edge is found

Ecosystem

• DSH Crew — dispatch work to DSH agents from Claude Code / Codex
• DSH iOS — a live iOS Simulator or USB iPhone inside the conversation
• DSH Android — a live Android emulator or USB device inside the conversation
• DSH Noema — long-term memory for DSH
• DSH OpenPencil — inspect and edit .op design documents inside a conversation

Credits & License

• three.js — the 3D runtime bundled into voxel games (MIT).
• qrcode-generator — Kazuhiko Arase — the QR code in the sidebar's share panel (MIT).
• Playwright (playwright-core) — drives the browser for playtests (Apache-2.0; runtime dependency).
• The templates, sprites and voxel models are original to this project.
• See THIRD_PARTY_NOTICES.md for the full notices.

License: MIT