LangSmith Studio

import { createAgent } from "@langchain/langgraph";

function sendEmail(to: string, subject: string, body: string): string {
    // 发送电子邮件
    const email = {
        to: to,
        subject: subject,
        body: body
    };
    // ... 电子邮件发送逻辑

    return `Email sent to ${to}`;
}

const agent = createAgent({
    model: "gpt-5.4",
    tools: [sendEmail],
    systemPrompt: "You are an email assistant. Always use the sendEmail tool.",
});

export { agent };

LANGSMITH_API_KEY=lsv2...

{
  "dependencies": ["."],
  "graphs": {
    "agent": "./src/agent.ts:agent"
  },
  "env": ".env"
}