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ARBuilder MCP server

Lets your AI write Arbitrum code: Stylus contracts, bridges, full dApps, and Orbit chain setups.

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ARBuilder is a helper for people building on Arbitrum, a blockchain network. It lets your AI assistant write code for Arbitrum projects, like smart contracts, bridges, and small apps, based on what you ask for in plain words. It is most useful if you already write code or are learning to, and you want a head start on Arbitrum-specific pieces.

What is an MCP server? The 30-second version

On its own, your AI can only chat. An MCP server is a small helper program that gives your AI a new skill or a connection to an app or service. This one connects your AI to ARBuilder, which knows a lot about Arbitrum. So when you ask for Arbitrum code, your AI can reach out to ARBuilder and bring back real code and answers instead of guessing.

What this MCP server does

You ask your AI for something, like a Stylus smart contract or a bridge setup. Your AI sends that request to ARBuilder through this helper. ARBuilder looks through Arbitrum documentation and code examples it has stored, then writes code or an answer for you. Your AI shows you the result in the chat, usually as code you can copy into your project. It can also help you plan a whole small app, step by step.

Flow diagram: you ask your AI “Write a Stylus contract that stores a number”, the ARBuilder MCP server connects it to ARBuilder, and you get back code you can copy.

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What you can do with it

Generate Stylus smart contracts in Rust
Create cross-chain bridge and messaging code
Build full dApp pieces like backend, frontend, indexer, and oracle
Help set up an Orbit chain configuration and deployment
Write tests for your Stylus contracts
Answer questions about Stylus and Arbitrum bridging
Validate Stylus code and suggest fixes

Try asking your AI

“Write me a simple Stylus contract that stores a number and lets me update it”
“Show me how to bridge tokens from Ethereum to Arbitrum using the SDK”
“Generate a small dApp with a Next.js frontend and a backend that reads my contract”
“Help me set up an Orbit chain config for a test network”

What it gives back to you

You get code files, code snippets, and short explanations right in your chat. Sometimes it returns step-by-step instructions or a plan for a bigger project. It can also return test files or validation notes about your code. Everything comes back as text you can copy into your editor.

Before you start

What you need

An API key from arbuilder.app (a kind of password the site gives you)
Node.js installed if you use the hosted setup
A code editor or AI app that supports MCP servers, like Cursor, VS Code, or Claude Code

Good to know

The code it writes is a starting point, so always read it and test it yourself before using it with real money or on a live network.

Install it with your AI

Add ARBuilder MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check ARBuilder MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.