// Run it by with LangChain.js.
// npm install langchain @langchain/anthropic @langchain/mcp-adapters
// Env: RUNITBY_API_KEY (https://runitby.app/app/keys), ANTHROPIC_API_KEY
import { ChatAnthropic } from '@langchain/anthropic'
import { MCPAdapter } from '@langchain/mcp-adapters'
import { createAgent } from 'langchain'

const mcp = new MCPAdapter({
  servers: {
    runitby: {
      url: 'https://runitby.app/mcp',
      headers: { Authorization: `Bearer ${process.env.RUNITBY_API_KEY}` },
    },
  },
})

try {
  const agent = createAgent({
    model: new ChatAnthropic({ model: 'claude-sonnet-5-5' }),
    tools: await mcp.listTools(),
  })
  const { messages } = await agent.invoke({
    messages: [
      {
        role: 'user',
        content:
          'Ask Jordan (jordan@example.com) for her shipping address: name, street, city, postal ' +
          'code and country. Email her the link, then wait for her answer and print it.',
      },
    ],
  })
  console.log(messages.at(-1)?.text)
} finally {
  await mcp.close()
}