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FAB Marketplace Submission Checklist

Last verified: 2026-06-21 against the 5-8 branch (UE 5.8).

Product Listing

General

  • All text must be accurate and relevant to the asset — FAB-DESCRIPTION.md and FAB_Tech_Details.md rewritten for the 5.8 MCP-Expansion positioning; .uplugin Description updated (no longer references chat)
  • All text fields must contain an English version

Media

  • Media must accurately display the relevant functionality or contents of the project ⚠️ Needs screenshots/video

Technical Information

  • All Technical Information fields must be filled out in their entirety ⚠️ Completed during submission from FAB_Tech_Details.md
  • Technical Information identifies dependencies/prerequisites — see FAB_Tech_Details.md (UE 5.8+, native MCP stack must be enabled first; auto-enabled engine plugins listed)

Project Files

  • Each Project File Link hosts only one Plugin folder with the proper structure
  • Project(s) match the Supported Engine Versions listed (UE 5.8)
  • Distribution Method is appropriate (code plugin)

Content

Files

  • All asset types are inside their respective folders
  • Project contains no unused folders or assets — removed orphan ErrorCodes_python_addition.h (a redundant, unreferenced dev fragment already merged into ErrorCodes.h); MakePlugin.ps1 excludes dev artifacts
  • .uproject has unused plugins disabled — N/A for plugin-only distribution

Documentation

  • Publisher provides linked or in-editor documentation/tutorials
    • README.md: installation + usage guide (shipped)
    • Resources/Icon128.png: plugin icon shipped (Resources/BUILD_PLUGIN.md is a dev doc, excluded)
    • docs/: developer documentation (excluded from package by MakePlugin.ps1)
    • Content/samples/AGENTS.md.sample: agent integration guide (shipped)

Legal

  • Products must not be offensive, vulgar, or slanderous
  • Megascans content is not re-distributed — no Megascans used
  • Epic sample content/source used for display/example only

Code Plugins

.uplugin Configuration

  • EngineVersion = "5.8.0"
  • WhitelistPlatforms = Win64 + Linux + Mac (matches supported target platforms)
  • FabURL set with Listing ID
  • DocsURL, SupportURL, CreatedByURL populated (vibeue.com) — confirm /support resolves
  • Resources/Icon128.png present (128×128) — placeholder lettermark; swap for final art if desired

Copyright & Source Code

  • All source/header files (105 files) contain the copyright notice
    • Format: // Copyright Buckley Builds LLC 2026 All Rights Reserved.

File Structure

  • Plugin folder contains no unused/local folders in packaged distribution
    • MakePlugin.ps1 excludes: Binaries, Intermediate, .git, .github, docs, *.exe, and dev files (FAB-DESCRIPTION.md, FAB_Tech_Details.md, FAB-Checklist.md, .gitignore)
  • FilterPlugin.ini includes custom distribution folders
    • Includes: /README.md, /test_prompts/... (Content/, Resources/, Source/, Config/ and the .uplugin are included automatically; Content/Python/init_unreal.py registers skills at startup)
  • All file paths from the plugin folder are ≤170 characters (longest ≈78)

Build & Dependencies

  • Plugin generates no errors or consequential warnings — builds clean under warnings-as-errors (bWarningsAsErrors = true, -StrictRebuild)
  • C++ third-party code/libraries in ThirdParty folder — N/A, no C++ third-party code
  • Shipped Python (Content/Python/init_unreal.py) imports only engine modules (unreal, toolset_registry) — no third-party packages
  • Third Party Software form — N/A, no third-party libraries shipped

Validation Summary

✅ Passing

  • All shipped text accurate and in English (descriptions + .uplugin updated for 5.8)
  • Plugin file structure correct; no unused assets (orphan header removed)
  • Engine version 5.8 supported; platforms Win64, Linux, and Mac
  • Documentation accessible (README.md + Resources/ + AGENTS.md.sample)
  • No offensive content; no redistributed Epic/Megascans content
  • EngineVersion + WhitelistPlatforms + FabURL configured
  • All 105 source files have copyright headers
  • FilterPlugin.ini + MakePlugin.ps1 exclusions configured correctly
  • File path lengths within limits
  • No build errors/warnings

⚠️ Needs Attention

  1. Media: create screenshots/video showing functionality (agent driving the editor via MCP, terrain, profiling)
  2. Technical Information: paste FAB_Tech_Details.md content into the FAB form during submission

Pre-Submission Tasks

  • Create 3-5 screenshots (MCP agent in action, terrain heightmap import, performance profiling, Blueprint/UMG)
  • Create a 1-2 minute demo video
  • Run MakePlugin.ps1 to generate the final package
  • Test the package in a clean UE 5.8 project

Status: code/text ready | Remaining: media assets + final package test