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\n\n# 🦑 use-mcp 🦑\n\n
\n\n[![GitHub last commit](https://img.shields.io/github/last-commit/modelcontextprotocol/use-mcp?logo=github&style=flat&label=​)](https://github.com/modelcontextprotocol/use-mcp)  [![npm](https://img.shields.io/npm/v/use-mcp?label=​&logo=npm)](https://www.npmjs.com/package/use-mcp) ![GitHub License](https://img.shields.io/github/license/modelcontextprotocol/use-mcp)\n\nA lightweight React hook for connecting to [Model Context Protocol (MCP)](https://github.com/modelcontextprotocol) servers. Simplifies authentication and tool calling for AI systems implementing the MCP standard.\n\nTry it out: [Chat Demo](https://chat.use-mcp.dev) | [MCP Inspector](https://inspector.use-mcp.dev) | [Cloudflare Workers AI Playground](https://playground.ai.cloudflare.com/)\n\n## Installation\n\n```bash\nnpm install use-mcp\n# or\npnpm add use-mcp\n# or\nyarn add use-mcp\n```\n\n## Development\n\nTo run the development environment with all examples and servers:\n\n```bash\npnpm dev\n```\n\nThis starts:\n- **Inspector**: http://localhost:5001 - MCP server debugging tool\n- **Chat UI**: http://localhost:5002 - Example chat interface\n- **Hono MCP Server**: http://localhost:5101 - Example MCP server\n- **CF Agents MCP Server**: http://localhost:5102 - Cloudflare Workers AI MCP server\n\n### Testing\n\nIntegration tests are located in the `test/` directory and run headlessly by default:\n\n```bash\ncd test && pnpm test # Run tests headlessly (default)\ncd test && pnpm test:headed # Run tests with visible browser\ncd test && pnpm test:watch # Run tests in watch mode\ncd test && pnpm test:ui # Run tests with interactive UI\n```\n\n## Features\n\n- 🔄 Automatic connection management with reconnection and retries\n- 🔐 OAuth authentication flow handling with popup and fallback support\n- 📦 Simple React hook interface for MCP integration\n- 🧰 Full support for MCP tools, resources, and prompts\n- 📄 Access server resources and read their contents\n- 💬 Use server-provided prompt templates\n- 🧰 TypeScript types for editor assistance and type checking\n- 📝 Comprehensive logging for debugging\n- 🌐 Works with both HTTP and SSE (Server-Sent Events) transports\n\n## Quick Start\n\n```tsx\nimport { useMcp } from 'use-mcp/react'\n\nfunction MyAIComponent() {\n const {\n state, // Connection state: 'discovering' | 'pending_auth' | 'authenticating' | 'connecting' | 'loading' | 'ready' | 'failed'\n tools, // Available tools from MCP server\n resources, // Available resources from MCP server\n prompts, // Available prompts from MCP server\n error, // Error message if connection failed\n callTool, // Function to call tools on the MCP server\n readResource, // Function to read resource contents\n getPrompt, // Function to get prompt messages\n retry, // Retry connection manually\n authenticate, // Manually trigger authentication\n clearStorage, // Clear stored tokens and credentials\n } = useMcp({\n url: 'https://your-mcp-server.com',\n clientName: 'My App',\n autoReconnect: true,\n })\n\n // Handle different states\n if (state === 'failed') {\n return (\n
\n

Connection failed: {error}

\n \n \n
\n )\n }\n\n if (state !== 'ready') {\n return
Connecting to AI service...
\n }\n\n // Use available tools\n const handleSearch = async () => {\n try {\n const result = await callTool('search', { query: 'example search' })\n console.log('Search results:', result)\n } catch (err) {\n console.error('Tool call failed:', err)\n }\n }\n\n return (\n
\n

Available Tools: {tools.length}

\n
    \n {tools.map(tool => (\n
  • {tool.name}
    • \n ))}\n
\n \n \n {/* Example: Display and read resources */}\n {resources.length > 0 && (\n
\n

Resources: {resources.length}

\n \n
\n )}\n \n {/* Example: Use prompts */}\n {prompts.length > 0 && (\n
\n

Prompts: {prompts.length}

\n \n
\n )}\n
\n )\n}\n```\n\n## Setting Up OAuth Callback\n\nTo handle the OAuth authentication flow, you need to set up a callback endpoint in your app.\n\n### With React Router\n\n```tsx\n// App.tsx with React Router\nimport { BrowserRouter as Router, Routes, Route } from 'react-router-dom'\nimport { useEffect } from 'react'\nimport { onMcpAuthorization } from 'use-mcp'\n\nfunction OAuthCallback() {\n useEffect(() => {\n onMcpAuthorization()\n }, [])\n\n return (\n
\n

Authenticating...

\n

This window should close automatically.

\n
\n )\n}\n\nfunction App() {\n return (\n \n \n } />\n } />\n \n \n )\n}\n```\n\n### With Next.js Pages Router\n\n```tsx\n// pages/oauth/callback.tsx\nimport { useEffect } from 'react'\nimport { onMcpAuthorization } from 'use-mcp'\n\nexport default function OAuthCallbackPage() {\n useEffect(() => {\n onMcpAuthorization()\n }, [])\n\n return (\n
\n

Authenticating...

\n

This window should close automatically.

\n
\n )\n}\n```\n\n## API Reference\n\n### `useMcp` Hook\n\n```ts\nfunction useMcp(options: UseMcpOptions): UseMcpResult\n```\n\n#### Options\n\n| Option | Type | Description |\n|--------|------|-------------|\n| `url` | `string` | **Required**. URL of your MCP server |\n| `clientName` | `string` | Name of your client for OAuth registration |\n| `clientUri` | `string` | URI of your client for OAuth registration |\n| `callbackUrl` | `string` | Custom callback URL for OAuth redirect (defaults to `/oauth/callback` on the current origin) |\n| `storageKeyPrefix` | `string` | Storage key prefix for OAuth data in localStorage (defaults to \"mcp:auth\") |\n| `clientConfig` | `object` | Custom configuration for the MCP client identity |\n| `debug` | `boolean` | Whether to enable verbose debug logging |\n| `autoRetry` | `boolean \\| number` | Auto retry connection if initial connection fails, with delay in ms |\n| `autoReconnect` | `boolean \\| number` | Auto reconnect if an established connection is lost, with delay in ms (default: 3000) |\n| `transportType` | `'auto' \\| 'http' \\| 'sse'` | Transport type preference: 'auto' (HTTP with SSE fallback), 'http' (HTTP only), 'sse' (SSE only) (default: 'auto') |\n| `preventAutoAuth` | `boolean` | Prevent automatic authentication popup on initial connection (default: false) |\n| `onPopupWindow` | `(url: string, features: string, window: Window \\| null) => void` | Callback invoked just after the authentication popup window is opened |\n\n#### Return Value\n\n| Property | Type | Description |\n|----------|------|-------------|\n| `state` | `string` | Current connection state: 'discovering', 'pending_auth', 'authenticating', 'connecting', 'loading', 'ready', 'failed' |\n| `tools` | `Tool[]` | Available tools from the MCP server |\n| `resources` | `Resource[]` | Available resources from the MCP server |\n| `resourceTemplates` | `ResourceTemplate[]` | Available resource templates from the MCP server |\n| `prompts` | `Prompt[]` | Available prompts from the MCP server |\n| `error` | `string \\| undefined` | Error message if connection failed |\n| `authUrl` | `string \\| undefined` | Manual authentication URL if popup is blocked |\n| `log` | `{ level: 'debug' \\| 'info' \\| 'warn' \\| 'error'; message: string; timestamp: number }[]` | Array of log messages |\n| `callTool` | `(name: string, args?: Record) => Promise` | Function to call a tool on the MCP server |\n| `listResources` | `() => Promise` | Refresh the list of available resources |\n| `readResource` | `(uri: string) => Promise<{ contents: Array<...> }>` | Read the contents of a specific resource |\n| `listPrompts` | `() => Promise` | Refresh the list of available prompts |\n| `getPrompt` | `(name: string, args?: Record) => Promise<{ messages: Array<...> }>` | Get a specific prompt with optional arguments |\n| `retry` | `() => void` | Manually attempt to reconnect |\n| `disconnect` | `() => void` | Disconnect from the MCP server |\n| `authenticate` | `() => void` | Manually trigger authentication |\n| `clearStorage` | `() => void` | Clear all stored authentication data |\n\n## License\n\nMIT","readmeFilename":"README.md"}