Minecraft Skin Studio

Use this skill when the user wants a Minecraft Java skin workflow, not a server workflow. If the current repo contains apps/minecraft-skinbar, use that workspace by default when the request involves a menu bar app, app UI, or local macOS workflow changes.

Quick Start

1. Treat the launcher-ready deliverable as a 64x64 skin PNG plus a preview image.
2. If the request touches the bundled app, run bash scripts/run_minecraft_skinbar.sh doctor first.
3. Run bash scripts/run_minecraft_skinbar.sh inspect before editing the app.
4. Use bash scripts/run_minecraft_skinbar.sh generate after changing apps/minecraft-skinbar/project.yml.
5. Use bash scripts/run_minecraft_skinbar.sh typecheck for a fast shell and Python syntax pass before the helper smoke test.
6. Use bash scripts/run_minecraft_skinbar.sh test after changing the Python helper, preview rendering, or launcher registration contract.
7. Use bash scripts/run_minecraft_skinbar.sh build after app UI, model, CLI wiring, or keychain changes.
8. Use bash scripts/run_minecraft_skinbar.sh run when you need the local menu bar app relaunched.
9. Prefer registering skins through the launcher's local custom-skins file instead of brittle UI clicking.
10. If the user has a prompt only, generate a draft skin sheet first, then clean it into a usable 64x64 skin.
11. Be honest that prompt-to-perfect skin generation is still draft-quality and may need a second pass.
12. If the user already has a PNG, skip generation and register it directly.

Workflow

Choose The Lane

• Use minecraft-skinbar-workspace when the user wants to build, troubleshoot, or refine the bundled macOS app in apps/minecraft-skinbar.
• Use go for the full flow: prompt draft, clean skin, preview, and launcher registration.
• Use generate when the user only wants files and iteration.
• Use register when they already have a valid skin PNG.
• Use render-preview when they want a quick visual check without touching the launcher.

Work The Bundled App First

• Read references/project-map.md before editing the app workspace.
• Prefer the local runner before typing xcodegen or xcodebuild manually.
• Keep Minecraft Skin Bar compact and menu-bar-first.
• Preserve the current split:
  • SkinBarModel owns local state, launcher-facing actions, and keychain-backed API key handling
  • SkinStudioCLI shells out to minecraft_skin_studio.py through uv
  • MenuBarView stays focused on prompt, import, preview, and launcher handoff
• Keep OpenAI API keys in Keychain or environment variables only. Do not add plaintext config storage.
• Keep skin output local in ~/Pictures/Minecraft Skins unless the user explicitly asks for another path.
• The current app project has no Xcode unit-test target, so use typecheck for the fastest helper sanity pass, test for the helper smoke path, and build as the strongest native validation.

Skin Rules

• Java launcher skins should be treated as 64x64 PNG files.
• Keep the launcher-facing flow simple:
  • skin PNG
  • preview PNG
  • custom skin entry in launcher_custom_skins.json
• If the user asks for direct launcher automation, prefer the local JSON registration path first.
• Do not pretend generic image generation is guaranteed to produce a perfect UV layout on the first try.

Required Deliverables

• A launcher-ready skin PNG path.
• A preview image path.
• A clear note on whether the skin was registered into the local launcher library.
• If generation was used, a short quality note about whether the result looks usable or needs another pass.

Editing Guidance

• Keep prompts visual and specific: outfit, palette, theme, face detail, accessories.
• Use wide unless the user explicitly wants slim.
• Prefer simple names for launcher entries.
• Do not overwrite an existing launcher skin entry unless the user clearly wants a replace/update behavior.
• If you edit the bundled app, preserve the local-first workflow:
  • generate or import
  • preview locally
  • register into the launcher JSON
  • open the launcher or reveal the saved files
• Do not pretend the app can silently inject skins into Mojang services or change the active skin without the launcher's own local flow.

Resources

• scripts/minecraft_skin_studio.py: generate, clean, preview, and register skins.
• scripts/run_minecraft_skinbar.sh: local doctor, inspect, generate, typecheck, test, open, build, and run helper for apps/minecraft-skinbar.
• references/launcher-flow.md: launcher storage path, workflow boundaries, and practical limits.
• references/project-map.md: bundled app target map, main files, and validation notes.
• ../../apps/minecraft-skinbar/: the bundled macOS menu bar app workspace.
• agents/openai.yaml: UI metadata and default invocation prompt.