Error: No serverManagerFactory passed to MCPAgent constructor.

[healer-125]

Describe the bug
When I use this code in my Express.js code

// 1. Configure MCP servers
const mcp_client_config = {
  mcpServers: {
    airbnb: { command: "npx", args: ["@openbnb/mcp-server-airbnb"] },
    playwright: { command: "npx", args: ["@playwright/mcp@latest"] },
  },
}
const client = MCPClient.fromDict(mcp_client_config)
// 2. Create LLM
const llm = new ChatOpenAI({ modelName: 'gpt-4o' })
// 3. Instantiate agent
const agent = new MCPAgent({ llm, client, useServerManager: true })
// 4. Run query
const result = await agent.run(
  "Search Airbnb in Barcelona, then Google restaurants nearby"
)
console.log("Result:", result)

My Environment

• Node version: 24
• npm version: 11.3.0
• OS: Windows
• Package version: "@langchain/openai": "^0.5.12", "langchain": "^0.3.27", "mcp-use": "^0.0.6"

Why do I see the above issue?

[pietrozullo]

I do not see the issue or error from the information u shared, can you share the error you get ?