MCP Client Generator

🚀 Generate type-safe TypeScript clients from any MCP (Model Context Protocol) server.

import { notion, github, slack } from "./src/mcp-client";

// Type-safe client calls with full IntelliSense
const page = await notion.createPage({
  title: "Meeting Notes",
  content: "Discussion about Q4 roadmap...",
});

const issue = await github.createIssue({
  title: "Bug: Login failure",
  body: "Users cannot authenticate...",
});

await slack.notify({
  channel: "#dev",
  message: `New issue created: ${issue.url}`,
});

Features

✨ Type-Safe - Full TypeScript support with generated types
🔄 Multi-Provider - Connect to multiple MCP servers simultaneously
🎯 Tree-Shakable - Only bundle the methods you use
⚡ Fast - Built with Bun for optimal performance
🛠️ Interactive CLI - Smart prompts with sensible defaults
⚙️ Flexible - Works with multiple MCP config formats

Installation

npm install -g mcp-client-gen
# or use directly
npx mcp-client-gen

Quick Start

1. Configure MCP Servers

Create a .mcp.json file with your MCP server endpoints:

{
  "mcpServers": {
    "notion": {
      "type": "http",
      "url": "https://mcp.notion.com/mcp",
    },
    "github": {
      "type": "http",
      "url": "https://api.githubcopilot.com/mcp/",
    },
  },
}

2. Generate Client SDK

Interactive Mode (Recommended):

npx mcp-client-gen    # Launch interactive prompts
npx mcp-client-gen -y # Accept all defaults and proceed

Direct Mode:

npx mcp-client-gen ./src/mcp-client.ts

3. Use the Generated Client

import { notion } from "./src/mcp-client";

// All methods are fully typed based on the MCP server schema
const page = await notion.fetchPage("page-id");
const newPage = await notion.createPage({
  title: "My Page",
  content: "Page content...",
});

CLI Reference

Interactive Mode

npx mcp-client-gen              # Launch interactive prompts
npx mcp-client-gen -y           # Accept defaults and proceed
npx mcp-client-gen --yes        # Same as -y

Direct Mode

npx mcp-client-gen [options] <output-file>

Arguments:
  output-file          Path for the generated client file

Options:
  --config <file>      MCP configuration file (default: auto-discover)
  -y, --yes            Accept all defaults and skip prompts
  --help              Show help information

Examples:
  npx mcp-client-gen                           # Interactive mode
  npx mcp-client-gen -y                        # Quick generation with defaults
  npx mcp-client-gen ./src/mcp-client.ts       # Direct mode with output file
  npx mcp-client-gen --config custom.json ./src/clients.ts

Use Cases

🔗 API Integration - Connect to multiple services with one SDK
🤖 Workflow Automation - Build cross-platform automation scripts
📊 Data Synchronization - Keep data in sync across different platforms
🧪 Rapid Prototyping - Quickly test integrations with type safety

Development Status

Preview Release - This is an early preview. The core CLI and configuration parsing works, but MCP server introspection is still in development.

Current Status:

• ✅ CLI interface and configuration parsing
• ✅ Interactive prompts with smart defaults
• ✅ Multi-server client generation structure
• ✅ Multiple MCP config format support (.mcp.json, .cursor/, .vscode/)
• 🚧 MCP server schema introspection (in progress)
• 🚧 Real-time type generation from server capabilities
• 📋 Plugin system for custom transformations

Coming Soon:

• Full MCP protocol implementation
• Authentication handling
• Streaming support
• Error handling and retries

Authentication

Generated MCP clients include built-in support for OAuth 2.1 authentication using RFC 7591 Dynamic Client Registration. The authentication flow is handled automatically:

OAuth 2.1 Support

• Dynamic Client Registration (RFC 7591) - Clients automatically register with OAuth providers
• PKCE Flow (RFC 7636) - Secure authorization code exchange with Proof Key for Code Exchange
• Multiple Auth Methods - Supports client_secret_basic, client_secret_post, and public clients
• Token Management - Automatic token refresh and credential storage
• Resource Protection - RFC 9728 OAuth 2.0 Protected Resource Metadata support

Authentication Flow

1. Discovery - Client discovers OAuth authorization server metadata
2. Registration - Dynamic client registration if credentials not found
3. Authorization - PKCE-based authorization code flow initiation
4. Token Exchange - Secure token exchange with automatic refresh
5. API Calls - Authenticated requests using Bearer tokens

Configuration

Authentication is configured per MCP server in your .mcp.json:

{
  "mcpServers": {
    "secured-service": {
      "type": "http",
      "url": "https://api.example.com/mcp",
      "auth": {
        "type": "oauth",
        "clientId": "your-client-id", // Optional for dynamic registration
        "scopes": ["read", "write"],
      },
    },
  },
}

Support & License

If this tool helps you build amazing integrations, consider sponsoring the project to support continued development. 💖

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MIT Licensed • Feel free to use this in your commercial projects, contribute back, or fork it entirely. Code should be free! 🔓

Built with ❤️ by Konstantin Tarkus and contributors.