"OpenAI has rolled out full Model Context Protocol (MCP) support in ChatGPT, bringing developers a long-requested feature: the ability to use custom connectors for both read and write actions directly inside chats. The feature, now in beta under Developer Mode, effectively turns ChatGPT into a programmable automation hub capable of interacting with external systems or internal APIs. Until now, ChatGPT's built-in tools were limited mainly to reading or fetching data - such as browsing the web or retrieving documents."
"According to OpenAI, the new mode is "powerful but dangerous," as it gives the model the ability to perform real write operations. The company emphasizes the need for developers to test connectors carefully, remain alert to prompt injection attacks, and confirm all write actions before execution. Each tool call includes an expandable JSON payload for inspection, and ChatGPT will prompt users to review and approve any action that modifies data."
OpenAI enabled full Model Context Protocol (MCP) support in ChatGPT, allowing developers to register custom connectors for both read and write actions within chats. Developer Mode exposes any compatible tool that supports structured actions, enabling ChatGPT to update Jira tickets, trigger workflows, or write to databases. The mode supports Server-Sent Events and streaming HTTP protocols, with optional OAuth authentication. Each tool call includes an expandable JSON payload and requires user review before executing write operations. Developers can set tool preferences, sequencing, and safety restrictions to reduce ambiguity and guard against prompt injection attacks. Connectors are added via Settings → Connectors → Advanced → Developer Mode.
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