canyoumod. GitHub
THE UNOFFICIAL UNIVERSAL-MODDER FIELD GUIDE

Universal Modder for Claude Code: can you mod your game?

Find out before you install anything. Pick your PC game for a clear verdict, the route to take, and a starter prompt.

Free. No sign-up. Offline play first.
THE 15-SECOND VERSION01 — 03
Pick your gameTerraria, Skyrim, or your next obsession.
Know what’s possibleA verdict. A route. No guesswork.
Make your first moveTake a ready-to-use prompt with you.
0:00 / 0:15
36 games in the field notes
TRY A FAVORITE
Assessment ready for Terraria
YOUR GAME, DECODED

Terraria

.NET / XNA / FNA · PC / offline assessment

Moddable offline

Yes. Start with the right tools.

  • tModLoader provides a documented content API.
  • Upstream records an in-game single-player example.
  • Multiplayer was not verified in that field note.
RECOMMENDED ROUTE

Start with a small tModLoader item mod in a new single-player world.

What you’ll need
  • A licensed PC copy and a separate save backup
  • Claude Code or another supported coding agent + universal-modder
  • Python 3.10+ and ffmpeg (uv recommended)
  • tModLoader matched to your Terraria build
  • .NET SDK required by that tModLoader release

Only if your idea needs it: fal API key for generated art (billed by fal) · Blender for 3D-to-sprite renders

Your starting prompt

COPY → PASTE → BUILD

Paste this into Claude Code with universal-modder installed.

Use universal-modder to plan a small Terraria mod for my own offline single-player PC copy. Add one original craftable lantern item through tModLoader, starting with a placeholder sprite. First confirm my exact game build and compatible tools, back up my saves, and explain the files you would change. Ask before installing a loader or changing game files. Stop if this requires anti-cheat or DRM bypass. Do not connect to multiplayer. Give me a reversible plan and a concrete in-game verification step.
READY FOR YOUR CODING AGENT
New to universal-modder? Start here
⌘ Under the hood Engine details & sources

.NET / XNA / FNA: tModLoader has a dedicated C# content API; match its supported Terraria branch.

Documentation-based assessment, reviewed 2026-10-04; not tested by CanYouMod. The upstream author reports single-player in-game testing on Terraria 1.4.4.9 via tModLoader 2026.07. That is evidence for this route, not certification of other builds.

Upstream knowledge base Source 1 Source 2
Offline single-player only. Back up your saves.Full game guide
THE ORIGINAL PROJECT

universal-modder on GitHub: what it does

rehan-remade/universal-modder is an open-source, MIT-licensed plugin that teaches coding agents how to mod PC games. CanYouMod is an independent guide to it, not the project itself.

  • Engine playbooksTwelve engine families, from Unity and Unreal to .NET/XNA, Bethesda and older native games.
  • Field notesA knowledge base of real modding attempts, including what worked and the dead ends.
  • Seven ways to installClaude Code, Codex, Gemini CLI, VS Code, Cursor, skills only, or a plain git clone. Install guide
  • Clear limitsOffline, single-player work. No anti-cheat or DRM bypasses, and no cheats against other players.
FROM THE FIELD NOTES

Big worlds. New possibilities.

Explore all 36 games

Terraria

.NET / XNA / FNA

Moddable offline

Stardew Valley

.NET / MonoGame

Moddable offline

Minecraft: Java Edition

Java / Minecraft

Moddable offline

The Elder Scrolls V: Skyrim

Creation Engine

Moddable offline

Hollow Knight

Unity / C#

Moddable offline

Elden Ring

FromSoftware engine

Not recommended
LESS GUESSING. MORE MAKING.

A starting point.
Not a magic button.

Safety comes first

Offline, single-player routes. No anti-cheat workarounds. Your saves deserve a backup.

Grounded in field notes

Source-based engine and loader guidance. Clear about what’s documented and what needs testing.

One useful next step

A practical route and a starter prompt. You bring the idea; the coding agent helps you build.

BEFORE YOU GO EXPLORING

A few good questions.

Still curious? Read the install guide

Want the longer playbooks? Get the Recipe Pack

What is universal-modder for Claude Code?+

universal-modder is an open-source project by rehan-remade that gives coding agents game-modding workflows and engine playbooks. CanYouMod is an independent guide that helps you choose a starting route; it does not run the plugin or create mods in your browser.

Does a green result mean my mod is guaranteed to work?+

No. Green means the documented offline modding route is a reasonable starting point. These are source-based assessments, not hands-on compatibility tests. Your game edition, patch, loader and intended change can all affect the outcome.

Can I use this with multiplayer games or anti-cheat?+

Do not use these workflows in protected multiplayer sessions. We do not provide anti-cheat bypasses, DRM bypasses, or cheats against other players. A modding route for a single-player edition does not establish that online use is safe.

Is this checker free? Do I need a fal key?+

The checker is free and requires no account. Using a coding agent may require a paid subscription or API billing. A fal key is only needed for optional generated assets, and fal charges separately. Blender is only needed for workflows such as 3D-to-sprite rendering.

Where can I find the original GitHub project?+

The original source, installation instructions, field notes and MIT license are at github.com/rehan-remade/universal-modder. This site is unofficial and is not affiliated with Anthropic or any game developer.