modmixer
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Mod your favourite games,
without writing code.

Chat. It builds. You play. Repeat.

Open Source · MIT License
SupportsRimWorldComing soon
FactorioStardew ValleyMinecraft
Modmixer app: chatting with the agent to build the Zombie Horde mod

Better mods, not more slop.

Made to be played, not just generated.

01

You design. The agent types.

Tell it what you want. It writes the code, the XML, the file layout. You play the result.

chat with the agent
a stealth mod for RimWorld where i’m the defender, raiders sneak in invisible
Quick fork before I scaffold: are infiltrators after a specific thing (artifact, marked colonist) or just picking colonists off?
specific targetperimeter game
specific. a sculpture they’re trying to steal, with a decoy next to it
02

Crash and performance fixes.

The agent launches the game, runs your mod, and monitors Player.log. When something breaks or slows down, it tells you why and fixes it automatically.

watching your game
· RGS_Infiltration queued · day 4
· camera + patrol post wired
⚠ Harmony patch on PawnRenderer.RenderPawnAt never fires
Suggested fix: switch Postfix Prefixapply
03

Knows the codebase.

The game's source, its DLCs, and the top Workshop mods are indexed locally. So is a corpus of community modding patterns. The agent works from real symbols instead of guessing.

looked up in source
PawnRenderer.RenderPawnAt
rimworld 1.5 · Source/PawnRenderer.cs:142
Harmony Prefix vs Postfix
modding pattern · 38 Workshop mods cited
ThingDef.graphicData
royalty dlc · Defs/ThingDefs_Items/Apparel_Royal.xml
04

Art management.

You can repurpose the game's existing textures or bring in your own. The agent wires up sheets, masks, naming, and def references.

game textures
mapped to
ClockworkLure.graphicData → Things/Clockwork/Lure
+ drop in custom art
05

One-click Workshop publish.

The agent builds the manifest, preview image, tags, and dependency list from your project, then pushes to Steam.

publish to steam workshop
Rim Gear Solid
preview.png · v1.0.0
tags
stealth · events · scenario
deps
harmony · core
publish→ steam
06

Built-in mod manager.

Manages every mod you have installed, not just the ones built in Modmixer. Load order is sorted automatically, dependencies are pulled in, and incompatibilities are flagged before launch.

load order
01Harmonycore
02HugsLibpulled in by Smart Priorities
03Smart Priorities
04Rim Gear Solidyour mod
Combat Extended conflicts with Rim Gear Solid weapons

Ready to mod?

Download. Plug in your AI. Build something tonight.