# genMC

> genMC is a free Minecraft studio in the browser for builds and skins, made to be used together with your own AI agent. genMC runs no AI of its own and never needs an API key: the agent you already use (Claude, ChatGPT, Codex, Claude Code, Cursor or any MCP client) connects over MCP and builds in the user's browser tab while they watch.

Key facts:

- Start page: https://genmc.app/ · Build studio: https://genmc.app/build · Skin studio: https://genmc.app/skin · Public gallery: https://genmc.app/gallery/builds
- Every gallery skin and build has its own page with picture, facts and downloads: https://genmc.app/gallery/skins/<id> and https://genmc.app/gallery/builds/<id> (all listed in https://genmc.app/sitemap.xml). A skin page links its 64 × 64 PNG (https://genmc.app/api/gallery/<id>?png) and opens the skin in the studio as a remix (https://genmc.app/skin?remix=<id>).
- Free skins: 220 original Minecraft skins in 22 themes, free to wear, edit and remix with no credit needed: https://genmc.app/#free-skins, all of them as one ZIP at https://genmc.app/downloads/genmc-skin-drop-220.zip, also in https://genmc.app/gallery/skins.
- MCP server: https://genmc.app/api/mcp. The user opens the studio, chooses "Connect agent" in the agent column and pastes the short pairing code (valid 10 minutes) into the agent's chat; from then on the agent's tools run in exactly that tab. Server card: https://genmc.app/.well-known/mcp/server-card.json.
- WebMCP: agents in a browser with site tools (document.modelContext) see genMC's tools directly. The start page, the knowledge base and the guide offer genmc_about, genmc_docs and genmc_open (opens a studio, the gallery or an article); each studio offers its own tools (build_get_state and the build_* tools, get_skin_state and the skin tools) plus genmc_docs.
- The agent writes small JavaScript construction programs, previews them, renders the scene to check its own work and commits each step to an undoable timeline (tools such as build_get_context, build_preview_program, build_render_scene, build_commit_preview).
- The user can mark blocks in the 3D view and say what should change; their own edits always come first.
- Walk (W A S D, Space, F to fly, E for doors), camera tours (export as MP4, 1920 × 1080), Slice through builds, named parts, a materials list in stacks and shulker boxes.
- Export: Sponge v3 .schem (WorldEdit), .mcfunction (up to 65,536 commands), JSON, PNG renders (640–2,400 px). Skins: 64 × 64 Classic and Slim.
- Limits: 10,000,000 blocks per build; the plot grows up to 768 blocks per axis.
- Free; no account needed to build, save or export (saved privately in the browser). An optional account (e-mail code or Google) publishes to the gallery and syncs builds across devices.
- genMC is an independent project, not an official Minecraft product, not approved by or associated with Mojang or Microsoft.
- Agents can also read the knowledge base with the MCP tool genmc_docs, or over plain HTTP: https://genmc.app/api/docs (contents, `?q=` to search, `?article=<slug>&format=md` for one article).

## Getting started

- [What is genMC?](https://genmc.app/api/docs?article=overview&format=md): A Minecraft studio in the browser that you and your AI agent use together: skins, builds and more, live in one tab. Web page: https://genmc.app/docs/overview
- [First steps](https://genmc.app/api/docs?article=first-steps&format=md): Make your first skin and your first build, connect an agent and take the result into Minecraft – in ten minutes. Web page: https://genmc.app/docs/first-steps
- [Finding your way around](https://genmc.app/api/docs?article=interface&format=md): The header, document row, agent column, dock and timeline that the studios share, plus settings, language and dark mode. Web page: https://genmc.app/docs/interface
- [What's new](https://genmc.app/api/docs?article=whats-new&format=md): The genMC releases and what each one brought, newest first. The version tag in the menu shows the latest. Web page: https://genmc.app/docs/whats-new

## Skin studio

- [Skin studio basics](https://genmc.app/api/docs?article=skin-studio&format=md): Classic and Slim models, the base and outer layer, 3D, 2D and split view, body parts and saved skins. Web page: https://genmc.app/docs/skin-studio
- [Painting and colors](https://genmc.app/api/docs?article=skin-painting&format=md): Pencil, eraser, face fill, colors and presets, and how to mark areas for your agent. Web page: https://genmc.app/docs/skin-painting
- [Styles and skin options](https://genmc.app/api/docs?article=skin-styles&format=md): Let your agent restyle a skin (Simple, Balanced, Graphic, Strong shading) or prepare several options to choose from. Web page: https://genmc.app/docs/skin-styles
- [Import, export and renderings](https://genmc.app/api/docs?article=skin-import-export&format=md): Import a PNG or a player's skin, export the Minecraft PNG, render images, and what the invisible marker in exports is. Web page: https://genmc.app/docs/skin-import-export
- [Timeline, versions and checkpoints](https://genmc.app/api/docs?article=skin-history&format=md): Undo and redo, play back a skin's history, compare versions, revert a single change and save named checkpoints. Web page: https://genmc.app/docs/skin-history

## Build studio

- [Build studio basics](https://genmc.app/api/docs?article=build-studio&format=md): Projects, the growing plot, the full Java block library, textures and how you and your agent share the work. Web page: https://genmc.app/docs/build-studio
- [Camera, flight and slicer](https://genmc.app/api/docs?article=build-navigation&format=md): Look around, fly through your build, use the view cube and cut it open with the slicer. Web page: https://genmc.app/docs/build-navigation
- [Marking blocks for your agent](https://genmc.app/api/docs?article=build-marking&format=md): Brush, Surface and Smart marking, adding and removing marks, and how marks travel with your requests. Web page: https://genmc.app/docs/build-marking
- [Structure, materials and effort](https://genmc.app/api/docs?article=build-plan&format=md): Browse, hide and isolate the parts of a build, get a bill of materials with stacks and shulker boxes, and estimate the survival effort. Web page: https://genmc.app/docs/build-plan
- [Walk mode, tours and videos](https://genmc.app/api/docs?article=build-walk-tour&format=md): Walk through your build like in Minecraft, play the agent's room tour and render it as an MP4 video. Web page: https://genmc.app/docs/build-walk-tour
- [Redstone](https://genmc.app/api/docs?article=build-redstone&format=md): Redstone just works in the 3D view – click a lever or button and lamps light, pistons push and doors open, like in Minecraft Java, in real game ticks. Web page: https://genmc.app/docs/build-redstone
- [Timeline, replay and undo](https://genmc.app/api/docs?article=build-timeline&format=md): Look at earlier versions and replay how a build grew without disturbing your agent; restore, undo and redo when you mean it. Web page: https://genmc.app/docs/build-timeline
- [Export, import and Minecraft](https://genmc.app/api/docs?article=build-export&format=md): Export a build as .schem for WorldEdit, .litematic for Litematica, .mcfunction, PNG, tour video or JSON – and import Minecraft schematics, gallery builds and JSON as new builds. Web page: https://genmc.app/docs/build-export

## Agents

- [How agents work with genMC](https://genmc.app/api/docs?article=agents-overview&format=md): What an agent can do in genMC, the two ways it connects (site tools and the MCP relay), and the safeguards that keep you in control. Web page: https://genmc.app/docs/agents-overview
- [Connect an agent](https://genmc.app/api/docs?article=connect-agent&format=md): Pair Claude, ChatGPT, Claude Code, Codex or another MCP client with your studio tab using a short code – step by step, with troubleshooting. Web page: https://genmc.app/docs/connect-agent
- [Requests, marks and Finish](https://genmc.app/api/docs?article=agent-collaboration&format=md): Send requests with marks and photos, follow the agent's progress, read the statuses and end a session with Finish. Web page: https://genmc.app/docs/agent-collaboration
- [Guide for agents](https://genmc.app/api/docs?article=agent-guide&format=md): The rules and the working loop for AI agents in genMC – revisions, requests, previews, named parts, renders and Finish. Web page: https://genmc.app/docs/agent-guide
- [Agent tool reference](https://genmc.app/api/docs?article=agent-tools&format=md): Every tool a connected agent can call, generated from the running studio code. Web page: https://genmc.app/docs/agent-tools

## Account, sharing & privacy

- [Accounts and sign-in](https://genmc.app/api/docs?article=accounts&format=md): Why an account is optional, how to sign in with an e-mail code or Google, and what happens to your work when you sign in or out. Web page: https://genmc.app/docs/accounts
- [Gallery, publishing and secret links](https://genmc.app/api/docs?article=sharing&format=md): Publish skins and builds to the public gallery, remix other people's work, report problems, and share a build privately with a secret link. Web page: https://genmc.app/docs/sharing
- [Storage and privacy](https://genmc.app/api/docs?article=privacy-storage&format=md): Where your work is saved, what stays private, what the developer can see, and how saving conflicts are handled. Web page: https://genmc.app/docs/privacy-storage

## Help & reference

- [Keyboard shortcuts](https://genmc.app/api/docs?article=shortcuts&format=md): Every keyboard shortcut of the skin studio, the build studio, flight, walk mode, the agent input and this knowledge base. Web page: https://genmc.app/docs/shortcuts
- [Limits](https://genmc.app/api/docs?article=limits&format=md): All sizes, counts and rate limits in one place – skins, builds, history, requests, agents, publishing and accounts. Web page: https://genmc.app/docs/limits
- [Troubleshooting](https://genmc.app/api/docs?article=troubleshooting&format=md): Solutions for the most common problems – agent connection, queued requests, saving conflicts, lost work, exports and performance – and how to send feedback. Web page: https://genmc.app/docs/troubleshooting
- [Glossary](https://genmc.app/api/docs?article=glossary&format=md): Short definitions of the terms used in genMC and in this knowledge base. Web page: https://genmc.app/docs/glossary

## Blog

- [genMC, a Minecraft MCP server for builds and skins](https://genmc.app/blog/minecraft-mcp-server) (2026-10-23): One server URL gives Claude, ChatGPT, Claude Code, Cursor, Gemini CLI and other MCP clients a Minecraft studio to build and paint in – no game, no API key, free. What it offers and how to add it to each agent.
- [How to build in Minecraft with Claude](https://genmc.app/blog/build-minecraft-with-claude) (2026-10-23): A step-by-step guide – connect Claude or Claude Code to genMC, describe a build, point at what should change, walk through it and bring it into your Minecraft world as a schematic.
- [How to make a Minecraft skin with AI](https://genmc.app/blog/ai-minecraft-skin) (2026-10-23): Describe a character and let your own AI agent paint the 64 × 64 skin pixel by pixel in genMC's skin studio – free, in the browser. Then fix details yourself and load it into Minecraft.
- [From 64 × 64 pixels to ten million blocks: how genMC came about](https://genmc.app/blog/how-genmc-began) (2026-10-20): genMC began as an experiment with a single Minecraft skin. Six weeks later it is a studio where you and your AI agent build whole mountains together. Here is how it got there, and what we learned along the way.
- [What genMC does differently](https://genmc.app/blog/what-makes-genmc-different) (2026-10-20): Prompt-to-schematic generators, bots in the game, video world models – there are many ways to bring AI into Minecraft. Here is where genMC fits in, what it does differently, and where other approaches are ahead.
- [Inside the agent: how language models build worlds](https://genmc.app/blog/how-agents-see-a-world) (2026-10-20): When you ask your agent for a cottage by a stream, no picture appears in its head. What happens instead, what "world model" really means, and how genMC turns a model's fuzzy sense of space into exact blocks.

## Optional

- [Knowledge base in German](https://genmc.app/docs/de): every article, also as Markdown with `&lang=de`
- [Blog in German](https://genmc.app/blog/de)
- [All English articles in one file](https://genmc.app/llms-full.txt)