How to integrate Close MCP with ChatGPT

How to integrate Close MCP with ChatGPT ChatGPT is one of the most popular AI tools today, with capabilities ranging from deep research and image generation to writing, coding, and everyday productivity. In this guide, I will explain the easiest and most secure way to connect your Close account to ChatGPT via Composio Connect, so it can summarize unread updates from this morning, create draft replies to urgent messages, fetch contact details for recent senders, and more without ever putting your account credentials at risk.

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Close is a CRM platform built for sales teams, combining calling, email automation, and predictive dialers. It streamlines sales workflows and boosts productivity with all-in-one communication tools.

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How to integrate Close MCP with ChatGPT

ChatGPT is one of the most popular AI tools today, with capabilities ranging from deep research and image generation to writing, coding, and everyday productivity.

In this guide, I will explain the easiest and most secure way to connect your Close account to ChatGPT via Composio Connect, so it can summarize unread updates from this morning, create draft replies to urgent messages, fetch contact details for recent senders, and more without ever putting your account credentials at risk.

Also integrate Close with

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's Close integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
  • 1,000+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
  • Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
  • Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

  • A ChatGPT account with Plus subscription or higher (Business, Enterprise, Edu, or Pro). We will use ChatGPT Web.
  • Access to the Close workspace you want to connect.
  • Composio MCP.

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect Close to ChatGPT

1. Enable Developer Mode

In ChatGPT, go to Settings > Apps > Advanced settings and turn on Developer Mode.

ChatGPT settings showing Developer Mode toggle

2. Add the MCP server

Click Create app, then paste the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
ChatGPT create app flow with Composio MCP URL

3. Authorize in your browser

A browser window will open automatically. Sign in to authorize ChatGPT to access your Composio account.

Composio authorization screen for ChatGPT MCP setup

4. Start using Composio

Composio tools are now available in ChatGPT chats and Deep Research. In every new chat, click the + icon at the bottom, click More, and select Composio to enable tools for that conversation.

What you can do after connecting Close

  • Create a new sales lead for Acme Corp
  • Log an outbound call with follow-up notes
  • Send an SMS to a lead about a meeting
  • List all notes added to your leads this week

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
TOOLS

Supported Tools

Every Close action and event your agent gets out of the box.

Create Call

Creates a new call record in Close.

Create Lead

Creates a new lead in Close CRM.

Create SMS Message

This tool creates a new SMS activity in Close CRM.

Create Task

This tool creates a new task in Close.

Delete Call

This tool allows you to delete a specific call activity in Close.

Get Notes

This tool retrieves a list of note activities from Close.

FRAMEWORKS

How to build Close MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Close MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Close MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Close MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Close MCP with Claude Cowork

Codex logo

Codex

Use Close MCP with Codex

OpenClaw logo

OpenClaw

Use Close MCP with OpenClaw

Hermes logo

Hermes

Use Close MCP with Hermes

CLI logo

CLI

Use Close MCP with CLI

Google ADK logo

Google ADK

Use Close MCP with Google ADK

LangChain logo

LangChain

Use Close MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Close MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Close MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Close MCP with LlamaIndex

CrewAI logo

CrewAI

Use Close MCP with CrewAI

FAQ

Frequently asked questions

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

Yes, you can. ChatGPT 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 Close tools.

Yes, absolutely. You can configure which Close 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 Close data and credentials are handled as safely as possible.

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Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
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.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

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.

Tomisin Jenrola
Tomisin Jenrola
Founder & CEO, SwarmZero

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.

Jerome Leclanche
Jerome Leclanche
Co-Founder, Ingram Technologies