Roblox MCP servers: connect Claude Code, Codex or Cursor to Roblox
What the Roblox Studio server and the PromptBlox server each do, and how to use them together.
A Roblox MCP server lets an AI coding agent work on a Roblox game directly, instead of you copying code back and forth. As of November 2026 there are two main ones. The server built into Roblox Studio works on the place you have open. The PromptBlox server builds whole games from a description and saves them in your PromptBlox account. They do different jobs, and they work well together.
MCP stands for Model Context Protocol, an open standard for connecting AI tools to other apps. A coding agent is an AI assistant that can run commands on your computer, such as Claude Code, Codex, Cursor or Gemini CLI. Each agent app has its own plans and age rules, and some are for adults only, so check before you sign up.
The two servers side by side
| Roblox Studio MCP server | PromptBlox MCP server | |
|---|---|---|
| Made by | Roblox | PromptBlox |
| Where it runs | Inside Roblox Studio on your computer | On PromptBlox. A small installer connects the coding agents on your computer |
| What the agent works on | The place you have open in Studio | Games saved as projects in your PromptBlox library |
| What the agent can do | Explore the place, write scripts, run Luau code, generate and insert assets, and test in play mode | Start a game from a description, answer the build’s questions, ask for changes, look at views of the result, and list or download your games |
| Agents it works with | Quick connect for Antigravity, Claude Code, Claude Desktop, Codex CLI, Cursor, Gemini CLI and Visual Studio Code | Claude Code, Claude Desktop, Codex, Cursor, VS Code, Windsurf, Gemini CLI and Antigravity |
| Best for | Changing and testing a game you already have | Getting a whole new game built, with saved versions |
| Getting it onto Roblox | You are already in Studio, so you publish there | Download the place file, then test and publish in Studio |
Turn on the Roblox Studio MCP server
Update Roblox Studio and open a place
Roblox’s Studio MCP server guide asks for the latest version of Studio and a coding agent already installed on your computer.
Enable the server in Assistant
Open Assistant, click the menu and choose Manage MCP Servers, then turn on Enable Studio as MCP server.
Connect your agent
The same panel has a quick connect list for supported agents and setup instructions for others. Turn on yours, then restart the agent so it loads the connection. As of November 2026, quick connect covers Antigravity, Claude Code, Claude Desktop, Codex CLI, Cursor, Gemini CLI and Visual Studio Code.
Connect the PromptBlox MCP server
You need a PromptBlox account, a coding agent and Node.js 20.3 or newer. Then:
- Run
npx -y promptblox-mcpin a terminal, or ask your agent to run it. - It prints a short code. Sign in to PromptBlox and approve that code.
- When the installer prints Connected, restart your agent.
PromptBlox works with Claude Code, Claude Desktop, Codex, Cursor, VS Code, Windsurf, Gemini CLI and Antigravity. One connection covers every one of them the installer finds on your computer. It lasts 90 days, PromptBlox emails you when an agent is connected, and you can revoke it at any time. Our setup guide has every step and fixes for common errors.
We also have a page for each of the most used agents: Claude Code, Codex and Cursor.
Your agent does the AI work with its own account. PromptBlox still uses some of your usage allowance for the parts it runs, such as the concept image for a new game, and new games count toward your plan’s saved games.
Use both together
- Build. Ask your agent for a game in PromptBlox, for example “Make me an obby on floating islands with three checkpoints in PromptBlox.”
- Look. The agent gets views of the finished world and can ask for changes before it tells you the game is ready.
- Download. Ask the agent to download the game. You get a Roblox place file.
- Test. Open the file in Roblox Studio with the Studio server turned on. PromptBlox gives the agent a playtest plan, the agent runs it with Studio’s own tools and reports what passed.
- Fix. Ask for the fixes as changes to the PromptBlox project, so they are saved as a new version.
Changes you make by hand in Studio do not sync back to the PromptBlox project, so decide where each fix should live.
Why use PromptBlox if your agent can already write Luau?
The AI model is the same either way. What changes is what stands around it. An agent working alone writes scripts and has to build the world part by part. With the PromptBlox server the agent writes a plan for the world and the gameplay, and PromptBlox does the rest:
- It builds the world. A compiler turns the plan into Roblox parts, so the agent does not place every block.
- It checks the build. A build cannot finish until every object the game needs exists and every scripted object is connected to a real script.
- It shows the result. The agent gets pictures of the world from several views and can correct what looks wrong.
- It keeps the project. Every build and change is a saved version in your library, next to the games you make on the website.
Our comparison of AI Roblox game makers explains why the system around the model matters more as a game gets bigger.
Other Roblox MCP servers
Developers also publish their own Roblox MCP servers on GitHub and in MCP directories. Any MCP server can read and change what it is connected to, so check who made it and what it can do before you connect it to a game you care about.
Questions about Roblox MCP servers
What is a Roblox MCP server?
It is a connection that lets an AI coding agent work on a Roblox game directly, instead of you copying code back and forth. MCP stands for Model Context Protocol, an open standard for connecting AI tools to other apps. Roblox Studio has one built in, and PromptBlox has one for building and saving whole games.
Does Roblox Studio have an MCP server?
Yes. It is built into Roblox Studio. Open Assistant, choose Manage MCP Servers and turn on Enable Studio as MCP server. A connected agent can then explore your open place, write scripts, run Luau code and test the game in play mode.
What does the PromptBlox MCP server do?
It lets your coding agent make and change Roblox games in your PromptBlox account. The agent writes the plan and the scripts. PromptBlox turns them into a Roblox world, checks the build, saves each version and exports a place file you can open in Roblox Studio.
Can Claude Code, Codex or Cursor make a Roblox game?
Yes, through an MCP server. With the Roblox Studio server, these agents write scripts and build inside a place you have open. With the PromptBlox server, they get a whole game built, checked and saved from a description, then download it as a place file for Studio.
Which one should I use?
Use the Roblox Studio server to work inside a place you already have open. Use the PromptBlox server to get a whole new game built from a description and saved as a project. Many people use both: build with PromptBlox, download the place, then test and fix it in Studio.
Is it safe to connect an agent to my Roblox game?
Connect only tools you trust. Roblox says connected clients can read and modify content in your open places. With PromptBlox you approve each connection with a code while signed in, you get an email when an agent connects, and you can revoke a connection at any time. Never give an agent your password.
Do I need to know how to code?
No, but you do need a coding agent installed on a computer and to be comfortable running one command. If that sounds like too much, you can build the same kind of game in the PromptBlox website with no setup.
Connect your coding agent and ask it for a game.
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