ARBuilder

Overview

ARBuilder is a sophisticated MCP server that leverages RAG technology to provide context-aware code generation specifically for the Arbitrum ecosystem. It features a hybrid search engine combining vector search, BM25 keyword matching, and cross-encoder reranking to retrieve relevant code snippets and documentation. The server exposes 19 specialized tools for generating Stylus smart contracts in Rust, cross-chain SDK implementations, full-stack dApp development (including backend, frontend, indexer, oracle components), and Orbit chain deployment assistance.

Try asking AI

After installing, here are 7 things you can ask your AI assistant:

• generate_stylus_code

  Generate Stylus smart contracts in Rust based on natural language prompts

  Try:Create a simple token contract for StylusTry:Build a voting contract with time locks
• ask_stylus

  Ask questions about Stylus development and best practices

  Try:How do I optimize gas in Stylus contracts?Try:What are the security considerations for Stylus?
• generate_bridge_code

  Generate cross-chain bridge implementation code for Arbitrum SDK

  Try:Create a simple ETH bridge to ArbitrumTry:Implement a generic messaging bridge
• generate_messaging_code

  Generate cross-chain messaging code for Arbitrum SDK

  Try:Set up cross-chain communication between Ethereum and ArbitrumTry:Create a message relayer system
• generate_backend

  Generate backend code for full-stack dApps using NestJS/Express

  Try:Create a backend service for NFT marketplaceTry:Build an API for DeFi lending platform
• generate_frontend

  Generate frontend code for full-stack dApps using Next.js + wagmi

  Try:Create a React interface for token exchangeTry:Build a dashboard for staking dApp
• orchestrate_dapp

  Orchestrate full-stack dApp development by coordinating all components

  Try:Build a complete NFT marketplace with all componentsTry:Create a DeFi lending protocol stack
• generate_orbit_config

  Generate configuration for Orbit chain deployment

  Try:Create an Orbit chain configuration for gaming dAppTry:Set up a custom token launchpad chain
• generate_orbit_deployment

  Generate deployment code for Orbit chains

  Try:Deploy an Orbit chain with custom governanceTry:Set up a testnet Orbit chain
• ask_orbit

  Ask questions about Orbit chain development and deployment

  Try:How do I upgrade an Orbit chain?Try:What are the security considerations for Orbit validators?
• validate_stylus_code

  Validate Stylus smart contracts for correctness and best practices

  Try:Check this contract for gas optimizationTry:Verify security of this token contract
• get_stylus_context

  Retrieve context information about Stylus development

  Try:Get latest Stylus documentationTry:Find examples of NFT contracts on Stylus

Comparable tools

Installation

# Claude Code
claude mcp add arbbuilder -- npx -y mcp-remote https://arbuilder.app/mcp --header "Authorization: Bearer YOUR_API_KEY"

{
  "mcpServers": {
    "arbbuilder": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://arbuilder.app/mcp",
               "--header", "Authorization: Bearer YOUR_API_KEY"]
    }
  }
}

FAQ

What is ARBuilder?

ARBuilder is an AI-powered development assistant specifically designed for the Arbitrum ecosystem. It provides 19 MCP tools to generate smart contracts, SDKs, dApps, and Orbit chain configurations through natural language prompts.

How does the RAG pipeline work?

ARBuilder uses a hybrid search approach combining vector search, BM25 keyword matching, and cross-encoder reranking. It processes documentation and code snippets through a 3-layer filtering system before embedding them with BGE-M3 model for retrieval.

What IDEs support ARBuilder?

ARBuilder integrates with Claude Code, Cursor, VS Code, and any other MCP client through either local stdio connection or remote mcp- proxy.

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