From Chatbot to Agent: How MCP Supercharges ChatGPT
Generative AI
September 12, 2025
OpenAI’s Model Context Protocol (MCP) is an open standard that makes ChatGPT a governed agent, connecting to external tools and data for secure actions.

The recent update to ChatGPT, which unlocks full support for the Model Context Protocol (MCP) in its developer mode, represents a significant leap in how we interact with artificial intelligence. Imagine AI no longer just answering your questions, but actively performing tasks in the real world. The MCP can be thought of as a "USB-C port for AI applications," standardising how powerful language models like ChatGPT can connect and "plug into" various external systems, databases, and services. This means ChatGPT moves beyond simply pulling information to directly acting on those systems, transforming it from a passive information source into an active participant in your digital workflows.

This new capability means ChatGPT can perform "write" actions, not just "read" information. For example, instead of just telling you what's in a Jira ticket, ChatGPT can now update it. It can fire off a Zapier workflow, tweak information in your Customer Relationship Management (CRM) system, or link multiple services together to chain actions—all without you ever leaving the chat window. This transition allows ChatGPT to become an "active control centre" that can run your workflows in real-time, greatly enhancing its utility for tasks ranging from personal productivity to complex enterprise operations.

The importance of this update extends to developers, businesses, and everyday users. For developers, MCP provides a standardised, vendor-neutral way to connect their tools and services to AI, greatly reducing development complexity and fostering a richer ecosystem of AI-compatible services. Businesses can now securely integrate ChatGPT with their internal, proprietary systems, enabling automation of tasks like searching company databases or managing support tickets. For end-users, it means accomplishing complex, multi-step tasks through a single conversational interface, turning ChatGPT into a powerful "universal AI assistant" that can orchestrate work across different applications.

Despite the immense power gained, OpenAI has implemented robust safety measures to ensure users remain in control. Every "write" action, which modifies data or takes an irreversible step, requires your explicit approval. Before anything runs, ChatGPT shows you a full preview of the action it intends to take, giving you the power to approve or reject it. This careful design, which OpenAI describes as "powerful but dangerous" if not handled correctly, ensures that while ChatGPT can now act on your behalf, you ultimately decide which actions are taken, making it safe for both individual and enterprise use.

 

Eamonn Darcy
AI Technical Director
Sources:

Core “how-to” resources

  • MCP docs (OpenAI Platform): spec, connector setup, and examples. OpenAI Platform
  • Guide: Using the MCP tool in the Responses API (OpenAI Cookbook): step-by-step code to call remote MCP servers. OpenAI Cookbook
  • Agents SDK guide (Platform docs): building agents that use MCP tools. OpenAI Platform
  • OpenAI Academy – “MCP for Builders”: short intro video + curated “getting started” path. OpenAI Academy
  • Help Center – “Connectors in ChatGPT”: enabling connectors, custom connectors (MCP), plan availability, and security notes. OpenAI Help Center

Official announcements / background

  • “New tools and features in the Responses API” (May 21, 2025): adds support for remote MCP servers + notes OpenAI joining the MCP steering committee; links to Cookbook guide. OpenAI
  • “Introducing ChatGPT agent: bridging research and action” (July 17, 2025): describes agent mode that uses tools/connectors. OpenAI
  • ChatGPT agent — Release notes: availability by plan and feature evolution. OpenAI Help Center
  • ChatGPT agent — System Card (PDF): safety analysis of agentic tool use. OpenAI
  • “Introducing deep research” (ties into agent mode and connector use). OpenAI
  • ChatGPT Business/Enterprise release notes: connector rollouts, RBAC, and admin controls.