add_server_tool.ts

/**
 * Dynamic server management example for mcp-use.
 *
 * This example demonstrates how to equip an MCPAgent with a tool
 * to dynamically add and connect to MCP servers during a run.
 */

import { ChatOpenAI } from '@langchain/openai'
import { config } from 'dotenv'
import { MCPAgent, MCPClient } from '../index.js'
import { LangChainAdapter } from '../src/adapters/langchain_adapter.js'
import { ServerManager } from '../src/managers/server_manager.js'

// Load environment variables from .env file
config()

async function main() {
  // Create an empty MCPClient. It has no servers to start with.
  const client = new MCPClient()

  // The LLM to power the agent
  const llm = new ChatOpenAI({ model: 'gpt-4o', temperature: 0 })

  // Create the agent, enabling the ServerManager
  const agent = new MCPAgent({
    llm,
    client,
    maxSteps: 30,
    useServerManager: true,
    serverManagerFactory: client => new ServerManager(client, new LangChainAdapter()),
    autoInitialize: true,
  })

  // Define the server configuration that the agent will be asked to add.
  const serverConfigA = {
    command: 'npx',
    args: ['@playwright/mcp@latest'],
    env: {
      DISPLAY: ':1',
    },
  }
  const serverConfigB = {
    command: 'npx',
    args: ['-y', '@openbnb/mcp-server-airbnb', '--ignore-robots-txt'],
  }
  // We'll pass the config as a JSON string in the prompt.
  const serverConfigStringA = JSON.stringify(serverConfigA, null, 2)
  const serverConfigStringB = JSON.stringify(serverConfigB, null, 2)

  const query = `I need to browse the web. To do this, please add and connect to a new MCP server for Playwright.
    The server name is 'playwright' and its configuration is:
    \`\`\`json
    ${serverConfigStringA}
    \`\`\`
    Once the server is ready, navigate to https://github.com/mcp-use/mcp-use, give a star to the project, and then provide a concise summary of the project's README.

    Then, please add and connect to a new MCP server for Airbnb.
    The server name is 'airbnb' and its configuration is:
    \`\`\`json
    ${serverConfigStringB}
    \`\`\`
    and give me a house in the location of the company mcp-use.
    `

  // Run the agent. It will first use the AddMCPServerTool, then the tools from the new server.
  const result = await agent.run(query)

  console.log(`\n✅ Final Result:\n${result}`)

  // Clean up the session created by the agent
  await client.closeAllSessions()
}

if (import.meta.url === `file://${process.argv[1]}`) {
  main().catch(console.error)
}