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Setup

npm i @anthropic-ai/sdk @nangohq/node
This example uses the Node SDK, a lightweight wrapper over Nango’s REST API. The same flow works in any language by using the API reference.
Requirements:
  • A Nango account with a Hubspot integration configured and the whoami action enabled.
  • An Anthropic account.

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Usage

Example of a basic tool that calls an external API (Hubspot): 
import Anthropic from '@anthropic-ai/sdk';
import { Nango } from "@nangohq/node";

export async function runAnthropicAgent() {
  const client = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY! });
  const nango = new Nango({ secretKey: process.env.NANGO_SECRET_KEY! });

  const userId = "user1", integrationId = "hubspot";

  // Step 1: Ensure the user is authorized
  console.log("🔒 Checking API authorization...")
  let connectionId = (await nango.listConnections({ integrationId, userId })).connections[0]?.connection_id;

  // Step 2: If the user is not authorized, redirect to the auth flow.
  if (!connectionId) {
    const session = await nango.createConnectSession({
      allowed_integrations: [integrationId],
      end_user: { id: userId },
    });

    console.log(`Please authorize the app by visiting this URL: ${session.data.connect_link}`);

    const connection = await nango.waitForConnection(integrationId, userId);
    connectionId = connection!.connection_id;
  }

  // Step 3: Send a prompt to your model with tool definitions
  console.log("🤖 Agent running...")
  const message = await client.messages.create({
    model: "claude-sonnet-4-5",
    max_tokens: 1024,
    messages: [
      {
        role: "user",
        content: "Using the who_am_i tool, provide the current user info."
      }
    ],
    tools: [
      {
        name: "who_am_i",
        description: "Get the current user info.",
        input_schema: {
          type: "object",
          properties: {},
          required: []
        }
      }
    ],
    tool_choice: { type: "auto" }
  });
  
  const toolUse = message.content.find((content) => content.type === "tool_use");
  
  if (toolUse && toolUse.type === "tool_use" && toolUse.name === "who_am_i") {
    // Step 4: Execute the requested tool with Nango
    const userInfo = await nango.triggerAction(integrationId, connectionId, "whoami");
    console.log("✅ Agent retrieved your Hubspot user info:", userInfo);
  } else {
    console.log(message.content.find((c) => c.type === "text")?.text);
  }
}
You can let agents or models introspect available tools and their specifications by calling this endpoint. Your model can then automatically decide which tool to call.