How to integrate Follow Up Boss MCP with Vercel AI SDK v6

This guide walks you through connecting Follow Up Boss to Vercel AI SDK v6 using the Composio tool router. By the end, you'll have a working Follow Up Boss agent that can list all leads added this week, update contact info for lead john doe, create a new deal for jane smith through natural language commands. This guide will help you understand how to give your Vercel AI SDK agent real control over a Follow Up Boss account through Composio's Follow Up Boss MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Follow Up Boss is a CRM designed for high-growth real estate teams. Centralize leads and follow-ups to drive smarter sales.

99 Tools

Introduction

This guide walks you through connecting Follow Up Boss to Vercel AI SDK v6 using the Composio tool router. By the end, you'll have a working Follow Up Boss agent that can list all leads added this week, update contact info for lead john doe, create a new deal for jane smith through natural language commands.

This guide will help you understand how to give your Vercel AI SDK agent real control over a Follow Up Boss account through Composio's Follow Up Boss MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Follow Up Boss with

ChatGPTOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenCodeCursorVS CodeOpenClawHermesCLIGoogle ADKLangChainMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • How to set up and configure a Vercel AI SDK agent with Follow Up Boss integration
  • Using Composio's Tool Router to dynamically load and access Follow Up Boss tools
  • Creating an MCP client connection using HTTP transport
  • Building an interactive CLI chat interface with conversation history management
  • Handling tool calls and results within the Vercel AI SDK framework

What is Vercel AI SDK?

The Vercel AI SDK is a TypeScript library for building AI-powered applications. It provides tools for creating agents that can use external services and maintain conversation state.

Key features include:

  • streamText: Core function for streaming responses with real-time tool support
  • MCP Client: Built-in support for Model Context Protocol via @ai-sdk/mcp
  • Step Counting: Control multi-step tool execution with stopWhen: stepCountIs()
  • OpenAI Provider: Native integration with OpenAI models

What is the Follow Up Boss MCP server, and what's possible with it?

The Follow Up Boss MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Follow Up Boss account. It provides structured and secure access so your agent can perform Follow Up Boss operations on your behalf.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
1

Prerequisites

Before you begin, make sure you have:
  • Node.js and npm installed
  • A Composio account with API key
  • An OpenAI API key
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install required dependencies

bash
npm install @ai-sdk/openai @ai-sdk/mcp @composio/core ai dotenv

First, install the necessary packages for your project.

What you're installing:

  • @ai-sdk/openai: Vercel AI SDK's OpenAI provider
  • @ai-sdk/mcp: MCP client for Vercel AI SDK
  • @composio/core: Composio SDK for tool integration
  • ai: Core Vercel AI SDK
  • dotenv: Environment variable management
4

Set up environment variables

bash
OPENAI_API_KEY=your_openai_api_key_here
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_user_id_here

Create a .env file in your project root.

What's needed:

  • OPENAI_API_KEY: Your OpenAI API key for GPT model access
  • COMPOSIO_API_KEY: Your Composio API key for tool access
  • COMPOSIO_USER_ID: A unique identifier for the user session
5

Import required modules and validate environment

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Composio } from "@composio/core";
import * as readline from "readline";
import { streamText, type ModelMessage, stepCountIs } from "ai";
import { createMCPClient } from "@ai-sdk/mcp";

const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey,
});
What's happening:
  • We're importing all necessary libraries including Vercel AI SDK's OpenAI provider and Composio
  • The dotenv/config import automatically loads environment variables
  • The MCP client import enables connection to Composio's tool server
6

Create Tool Router session and initialize MCP client

typescript
async function main() {
  // Create a tool router session for the user
  const session = await composio.create(composioUserID!, {
    toolkits: ["follow_up_boss"],
  });

  const mcpUrl = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Follow Up Boss tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned mcp object contains the URL and authentication headers needed to connect to the MCP server
  • This session provides access to all Follow Up Boss-related tools through the MCP protocol
7

Connect to MCP server and retrieve tools

typescript
const mcpClient = await createMCPClient({
  transport: {
    type: "http",
    url: mcpUrl,
    headers: session.mcp.headers, // Authentication headers for the Composio MCP server
  },
});

const tools = await mcpClient.tools();
What's happening:
  • We're creating an MCP client that connects to our Composio Tool Router session via HTTP
  • The mcp.url provides the endpoint, and mcp.headers contains authentication credentials
  • The type: "http" is important - Composio requires HTTP transport
  • tools() retrieves all available Follow Up Boss tools that the agent can use
8

Initialize conversation and CLI interface

typescript
let messages: ModelMessage[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log(
  "Ask any questions related to follow_up_boss, like summarize my last 5 emails, send an email, etc... :)))\n",
);

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "> ",
});

rl.prompt();
What's happening:
  • We initialize an empty messages array to maintain conversation history
  • A readline interface is created to accept user input from the command line
  • Instructions are displayed to guide the user on how to interact with the agent
9

Handle user input and stream responses with real-time tool feedback

typescript
rl.on("line", async (userInput: string) => {
  const trimmedInput = userInput.trim();

  if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
    console.log("\nGoodbye!");
    rl.close();
    process.exit(0);
  }

  if (!trimmedInput) {
    rl.prompt();
    return;
  }

  messages.push({ role: "user", content: trimmedInput });
  console.log("\nAgent is thinking...\n");

  try {
    const stream = streamText({
      model: openai("gpt-5"),
      messages,
      tools,
      toolChoice: "auto",
      stopWhen: stepCountIs(10),
      onStepFinish: (step) => {
        for (const toolCall of step.toolCalls) {
          console.log(`[Using tool: ${toolCall.toolName}]`);
          }
          if (step.toolCalls.length > 0) {
            console.log(""); // Add space after tool calls
          }
        },
      });

      for await (const chunk of stream.textStream) {
        process.stdout.write(chunk);
      }

      console.log("\n\n---\n");

      // Get final result for message history
      const response = await stream.response;
      if (response?.messages?.length) {
        messages.push(...response.messages);
      }
    } catch (error) {
      console.error("\nAn error occurred while talking to the agent:");
      console.error(error);
      console.log(
        "\nYou can try again or restart the app if it keeps happening.\n",
      );
    } finally {
      rl.prompt();
    }
  });

  rl.on("close", async () => {
    await mcpClient.close();
    console.log("\n👋 Session ended.");
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});
What's happening:
  • We use streamText instead of generateText to stream responses in real-time
  • toolChoice: "auto" allows the model to decide when to use Follow Up Boss tools
  • stopWhen: stepCountIs(10) allows up to 10 steps for complex multi-tool operations
  • onStepFinish callback displays which tools are being used in real-time
  • We iterate through the text stream to create a typewriter effect as the agent responds
  • The complete response is added to conversation history to maintain context
  • Errors are caught and displayed with helpful retry suggestions

Complete Code

Here's the complete code to get you started with Follow Up Boss and Vercel AI SDK:

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Composio } from "@composio/core";
import * as readline from "readline";
import { streamText, type ModelMessage, stepCountIs } from "ai";
import { createMCPClient } from "@ai-sdk/mcp";

const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey,
});

async function main() {
  // Create a tool router session for the user
  const session = await composio.create(composioUserID!, {
    toolkits: ["follow_up_boss"],
  });

  const mcpUrl = session.mcp.url;

  const mcpClient = await createMCPClient({
    transport: {
      type: "http",
      url: mcpUrl,
      headers: session.mcp.headers, // Authentication headers for the Composio MCP server
    },
  });

  const tools = await mcpClient.tools();

  let messages: ModelMessage[] = [];

  console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
  console.log(
    "Ask any questions related to follow_up_boss, like summarize my last 5 emails, send an email, etc... :)))\n",
  );

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: "> ",
  });

  rl.prompt();

  rl.on("line", async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
      console.log("\nGoodbye!");
      rl.close();
      process.exit(0);
    }

    if (!trimmedInput) {
      rl.prompt();
      return;
    }

    messages.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    try {
      const stream = streamText({
        model: openai("gpt-5"),
        messages,
        tools,
        toolChoice: "auto",
        stopWhen: stepCountIs(10),
        onStepFinish: (step) => {
          for (const toolCall of step.toolCalls) {
            console.log(`[Using tool: ${toolCall.toolName}]`);
          }
          if (step.toolCalls.length > 0) {
            console.log(""); // Add space after tool calls
          }
        },
      });

      for await (const chunk of stream.textStream) {
        process.stdout.write(chunk);
      }

      console.log("\n\n---\n");

      // Get final result for message history
      const response = await stream.response;
      if (response?.messages?.length) {
        messages.push(...response.messages);
      }
    } catch (error) {
      console.error("\nAn error occurred while talking to the agent:");
      console.error(error);
      console.log(
        "\nYou can try again or restart the app if it keeps happening.\n",
      );
    } finally {
      rl.prompt();
    }
  });

  rl.on("close", async () => {
    await mcpClient.close();
    console.log("\n👋 Session ended.");
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});

Conclusion

You've successfully built a Follow Up Boss agent using the Vercel AI SDK with streaming capabilities! This implementation provides a powerful foundation for building AI applications with natural language interfaces and real-time feedback.

Key features of this implementation:

  • Real-time streaming responses for a better user experience with typewriter effect
  • Live tool execution feedback showing which tools are being used as the agent works
  • Dynamic tool loading through Composio's Tool Router with secure authentication
  • Multi-step tool execution with configurable step limits (up to 10 steps)
  • Comprehensive error handling for robust agent execution
  • Conversation history maintenance for context-aware responses

You can extend this further by adding custom error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS

Supported Tools

Every Follow Up Boss action and event your agent gets out of the box.

Apply Action Plan to Person

Tool to apply an Action Plan to a person in Follow Up Boss.

Create Appointment

Tool to create a new appointment in Follow Up Boss.

Create appointment outcome

Tool to create an appointment outcome in Follow Up Boss.

Create Appointment Type

Tool to create a new appointment type in Follow Up Boss.

Create Call

Tool to add a call record to Follow Up Boss.

Create Custom Field

Tool to create a custom field in Follow Up Boss.

Create Deal Custom Field

Tool to create a custom field for deals in Follow Up Boss.

Create Deal

Tool to create a new deal in Follow Up Boss.

Create Email Marketing Campaign

Tool to create an email marketing campaign in Follow Up Boss.

Create Email Marketing Events

Tool to notify Follow Up Boss about marketing emails sent, opens, clicks, bounces, unsubscribes and spam reports.

Create Events

Tool to send in a lead or an event related to a lead in Follow Up Boss.

Create Group

Tool to create a new Follow Up Boss group with specified members and distribution settings.

Create Pipeline

Tool to create a new pipeline in Follow Up Boss.

Create Ponds

Tool to create a new pond in Follow Up Boss.

Create Reactions

Tool to add a reaction (emoji) to a Note, Call, or ThreadedReply.

Create Stage

Tool to create a new stage in Follow Up Boss.

Create Team

Tool to create a new team in Follow Up Boss.

Create email template

Tool to create a new email template in Follow Up Boss.

Create Text Message Template

Tool to create a text message template in Follow Up Boss.

Delete Appointment

Tool to delete an appointment by ID.

Delete Appointment Outcome

Tool to delete an appointment outcome by ID.

Delete Appointment Type

Tool to delete an appointment type by its ID.

Delete Custom Field

Tool to delete a custom field by its ID.

Delete Deal

Tool to delete a deal by its ID.

Delete Deal Custom Field

Tool to delete a deal custom field by ID.

Delete Group

Tool to delete a group by its ID.

Delete People Relationship

Tool to delete a people relationship by ID in Follow Up Boss.

Delete Pipeline

Tool to delete a pipeline by its ID from Follow Up Boss.

Delete Pond

Tool to delete a pond by its ID.

Delete Stage

Tool to delete a Follow Up Boss stage by ID.

Delete Team

Tool to delete a team by its ID.

Delete text message template

Tool to delete a text message template by ID.

Get Appointment

Tool to retrieve an appointment by its ID.

Get Appointment Outcome

Tool to retrieve an appointment outcome by ID.

Get Appointment Type

Tool to retrieve an appointment type by ID.

Get Call

Tool to retrieve a call by its ID from Follow Up Boss.

Get Deal

Tool to retrieve a deal by its ID from Follow Up Boss.

Get Deal Custom Field

Tool to retrieve a deal custom field by its ID from Follow Up Boss.

Get Event

Tool to retrieve a single event by its ID from Follow Up Boss.

Get Group

Tool to retrieve a group by its ID from Follow Up Boss.

Get Identity

Tool to retrieve identity and authentication information from Follow Up Boss.

Get Me

Tool to retrieve information about the currently authenticated user.

Get People Relationship

Tool to retrieve a people relationship by its ID from Follow Up Boss.

Get Pipeline

Tool to retrieve a pipeline by its ID from Follow Up Boss.

Get Ponds

Tool to retrieve a pond by its ID from Follow Up Boss.

Get Smart List

Tool to retrieve a Smart List by its ID from Follow Up Boss.

Get Stage

Tool to retrieve a stage by its ID from Follow Up Boss.

Get Team

Tool to retrieve a team by its ID from Follow Up Boss.

Get Template

Tool to retrieve an email template by its ID from Follow Up Boss.

Get Text Message

Tool to retrieve a text message by its ID from Follow Up Boss.

Get Text Message Template

Tool to retrieve a text message template by its ID from Follow Up Boss.

Get User

Tool to retrieve a user by its ID from Follow Up Boss.

List Action Plans

Tool to get a list of Action Plans from Follow Up Boss.

List Action Plans People

Tool to list Action Plans applied to a particular person or list people on a particular Action Plan.

List Appointment Outcomes

Tool to list all appointment outcomes from Follow Up Boss.

List Appointments

Tool to search for appointments in Follow Up Boss.

List Appointment Types

Tool to list all appointment types from Follow Up Boss.

List Calls

Tool to search for calls in Follow Up Boss.

List Custom Fields

Tool to list all custom fields in Follow Up Boss.

List Deal Custom Fields

Tool to list all deal custom fields in Follow Up Boss.

List Deals

Tool to search for and list deals from Follow Up Boss.

List Email Marketing Campaigns

Tool to list email marketing campaigns from Follow Up Boss.

List Email Marketing Events

Tool to retrieve email marketing events from Follow Up Boss.

List Events

Tool to search for and list events from Follow Up Boss.

List Groups

Tool to list all groups from Follow Up Boss.

List Groups Round Robin

Tool to list groups with round-robin data from Follow Up Boss.

List Inbox Apps

Tool to list all inbox app installations from Follow Up Boss.

List People Relationships

Tool to list all people relationships from Follow Up Boss.

List Pipelines

Tool to search for pipelines in Follow Up Boss.

List Ponds

Tool to list all ponds from Follow Up Boss.

List Smart Lists

Tool to list Smart Lists from Follow Up Boss.

List Stages

Tool to retrieve a list of stages from Follow Up Boss.

List Team Inboxes

Tool to list all shared team inboxes from Follow Up Boss.

List Teams

Tool to get a list of teams from Follow Up Boss.

List Templates

Tool to list all email templates from Follow Up Boss.

List Text Messages

Tool to list text messages for a person or phone number from Follow Up Boss.

List Text Message Templates

Tool to list all text message templates from Follow Up Boss.

List Timeframes

Tool to get a list of timeframes from Follow Up Boss.

List Users

Tool to search for and list users from Follow Up Boss.

List Webhooks

Tool to retrieve a list of webhooks from Follow Up Boss.

Merge Template

Tool to merge an email template with person data using Follow Up Boss API.

Merge Text Message Template

Tool to merge a text message template with person data.

Update Action Plan People Status

Tool to update the status of an Action Plan to Person relationship in Follow Up Boss.

Update Appointment

Tool to update an existing appointment in Follow Up Boss.

Update appointment outcome

Tool to update an existing appointment outcome in Follow Up Boss.

Update Appointment Type

Tool to update an existing appointment type in Follow Up Boss.

Update Call

Tool to update an existing call record in Follow Up Boss.

Update Custom Fields

Tool to update an existing custom field in Follow Up Boss by its ID.

Update Deal Custom Fields

Tool to update an existing deal custom field in Follow Up Boss.

Update Deal

Tool to update an existing deal in Follow Up Boss.

Update Email Marketing Campaign

Tool to update an existing email marketing campaign in Follow Up Boss.

Update Group

Tool to update an existing Follow Up Boss group with modified members and distribution settings.

Update People Relationships

Tool to update details of a specific people relationship in Follow Up Boss.

Update Pipeline

Tool to update an existing pipeline in Follow Up Boss.

Update Ponds

Tool to update an existing pond in Follow Up Boss.

Update Stage

Tool to update an existing stage in Follow Up Boss.

Update Team

Tool to update an existing team in Follow Up Boss.

Update email template

Tool to update an existing email template in Follow Up Boss.

Update Text Message Template

Tool to update an existing text message template in Follow Up Boss.

FRAMEWORKS

How to build Follow Up Boss MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Follow Up Boss MCP with ChatGPT

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Follow Up Boss MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Follow Up Boss MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Follow Up Boss MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Follow Up Boss MCP with Claude Cowork

Codex logo

Codex

Use Follow Up Boss MCP with Codex

Cursor logo

Cursor

Use Follow Up Boss MCP with Cursor

OpenClaw logo

OpenClaw

Use Follow Up Boss MCP with OpenClaw

Hermes logo

Hermes

Use Follow Up Boss MCP with Hermes

CLI logo

CLI

Use Follow Up Boss MCP with CLI

Google ADK logo

Google ADK

Use Follow Up Boss MCP with Google ADK

LangChain logo

LangChain

Use Follow Up Boss MCP with LangChain

Mastra AI logo

Mastra AI

Use Follow Up Boss MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Follow Up Boss MCP with LlamaIndex

CrewAI logo

CrewAI

Use Follow Up Boss MCP with CrewAI

OpenCode logo

OpenCode

Use Follow Up Boss MCP with OpenCode

VS Code logo

VS Code

Use Follow Up Boss MCP with VS Code

FAQ

Frequently asked questions

With a standalone Follow Up Boss MCP server, the agents and LLMs can only access a fixed set of Follow Up Boss tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Follow Up Boss and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Vercel AI SDK v6 fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Follow Up Boss tools.

Yes, absolutely. You can configure which Follow Up Boss scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Follow Up Boss data and credentials are handled as safely as possible.

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Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

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Abhi Arya
Co-founder, Opennote

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Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

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With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

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