MSW Packages — Official Prebuilt Catalog

MSW-Git/MSWPackages is the official MSW first-party repository of prebuilt feature packages. Before writing any standard game feature from scratch, check this catalog first — if a package matches, propose integration instead of zero-from-scratch implementation.

This skill is a thin index. Per-package details (README, source, integration steps) are fetched on demand from GitHub rather than mirrored here, so the catalog stays current automatically.

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Decision Flow

User asks for feature X
        │
        ▼
Match X against Feature → Package table below
        │
   ┌────┴─────┐
   │ Match    │ No match
   ▼          ▼
Scope-First check      Proceed with normal MSW
(see section below):   authoring (msw-scripting,
system vs UI-only?     msw-search, etc.)
        │
   ┌────┴───────────┐
   │ system         │ UI-only
   ▼                ▼
Fetch package    Route to msw-ui-system
README           (+ references/templates/, skip the rest of this skill)
        │
        ▼
Summarize for user
"Found <package>. README says: <summary>.
 Integrate this, or build from scratch?"
        │
   ┌────┴─────┐
   │          │
   ▼          ▼
Integrate    Build from scratch
        │
        ▼
Run Integration Workflow (below)

Default posture: ask the user before integrating. Do not auto-install without confirmation — packages can collide with existing UUIDs, sprite RUIDs, or naming conventions in the user's project.

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Feature → Package Mapping

When a user request mentions one of these features (Korean or English), look up the matching package and fetch its README first.

If multiple packages plausibly match (e.g. "ranking" → basic vs advanced), fetch both READMEs and let the user choose based on the comparison.

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Scope-First Routing (UI vs System)

When a request matches a catalog keyword but it is unclear whether the user wants the full system (data + logic + UI) or just the UI screen, ask ONE short question BEFORE fetching package files. Use the matching row from the table below.

Routing rule

Map the user's answer to a destination:

When to skip the question

Skip the Scope-First question and route directly when the user's request is already explicit:

• "from scratch" / "just the UI" / "only the screen" → msw-ui-system skill (+ references/templates/)
• "full system" / "with backend" / "with data" / "save score" → stay in msw-packages
• Pure low-level UI question (e.g. "how do I set anchor?") → msw-ui-system skill

Only ask when the keyword matches a catalog package AND the scope is genuinely ambiguous.

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Fetch Protocol

When a candidate package is identified:

1. README first (always)

https://raw.githubusercontent.com/MSW-Git/MSWPackages/main/<package-name>/README.md

Use WebFetch to pull this. Summarize the public API and use cases for the user before going further.

2. File tree (when integration is likely)

Use the GitHub tree API and grep for the package path:

https://api.github.com/repos/MSW-Git/MSWPackages/git/trees/main?recursive=1

The response is large and may be truncated. Grep the response for <package-name>/ to extract the file list. If truncated, fall back to per-directory tree calls:

https://api.github.com/repos/MSW-Git/MSWPackages/contents/<package-name>/MyDesk

Standard package layout:

• <package-name>/README.md
• <package-name>/<PackageName>.modpackage — installer manifest (treat as opaque)
• <package-name>/MyDesk/<PackageName>/Core/ — core scripts/UI to copy
• <package-name>/MyDesk/<PackageName>/Sample/ — example usage (do not copy unless requested)
• <package-name>/MyDesk/Util/ — shared utilities (some packages)

3. Raw file fetch (per-file as needed)

https://raw.githubusercontent.com/MSW-Git/MSWPackages/main/<path>

Substitute github.com/.../blob/main/... with raw.githubusercontent.com/.../main/... for any browsing URL.

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Integration Workflow

After the user confirms integration:

1. Map files into project layout:

• MyDesk/<PackageName>/Core/*.mlua → RootDesk/MyDesk/<PackageName>/
• MyDesk/<PackageName>/Core/*.ui → ui/
• MyDesk/<PackageName>/Core/*.model → RootDesk/MyDesk/Models/<Category>/
• MyDesk/Util/* → RootDesk/MyDesk/Util/ (reuse if already present)

1. Check UUID collisions: every entity id and EntryKey in incoming .ui/.model files must not already exist in the user's project. grep the workspace for collisions before writing. Regenerate any colliding UUID with a fresh hex UUID.

1. Check sprite RUID dependencies: scan the package files for hard-coded RUIDs. They reference MSW community resources — usually fine, but verify with msw-search if any look suspicious or you need a substitute.

1. Resolve cross-package dependencies: some packages depend on others (e.g. ranking may build on player-data). Read the package's README and source headers — install transitive packages first, then this one.

1. Apply with the standard MSW workflow: stop → refresh_workspace → play. Verify in build logs and runtime logs.

1. Wire into user's code: most packages expose a _<PackageName> Logic singleton. Call its API from the user's existing scripts (e.g. _MaplestoryToast:Show(...)).

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Pitfalls

• .modpackage files are NOT auto-installer scripts in this workflow — they are Maker-editor metadata. Manual file copy is what actually integrates the package.
• Hardcoded sprite RUIDs in samples: package samples often reference specific RUIDs for decoration sprites. These work but the user may want to substitute. Note this when summarizing.
• UI files use UIGroup root entities — when copying, route through msw-ui-system (UIBuilder.read/load to inspect, builder API to mutate; design rules — UIGroup root configuration, anchor mode pitfalls — live in the same skill). Do not hand-edit raw .ui JSON.
• Sample/ content is illustrative, not production — do not copy Sample/ files unless the user explicitly asks. Sample scripts often bind to keyboard shortcuts that conflict with the user's controls.
• No package replaces understanding of mlua — packages provide pre-built features but the user still needs msw-scripting knowledge to extend them.
• Don't bulk-install multiple packages speculatively — each integration adds files and surface area. Install one feature at a time, validate, then move on.

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When the user has already chosen "build from scratch"

Skip integration entirely. Proceed with normal MSW authoring (msw-scripting, msw-search, etc.). Do not silently keep nudging toward packages.

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When MSW-Git/MSWPackages is unreachable

• WebFetch returns an error or 404 → confirm the URL hasn't changed.
• Sandboxed network may block direct curl to api.github.com — prefer WebFetch for raw and HTML URLs.
• If everything fails, fall back to building from scratch and tell the user the package is currently inaccessible.

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Cross-references

• msw-general — workspace, file paths, MCP tools, coordinate systems.
• msw-scripting — .mlua syntax for hooking package APIs into game logic.
• msw-search — sprite/animation/sound RUID lookup when substituting package-bundled resources.