ChatGPT MCP and Apps: extensions you can try

A developer who tried ChatGPT Plugin Extensions says MCP Apps were already interesting enough, since showing UI directly in chat works better in some cases.

Supabase's new direction lets your app expose MCP so users can connect ChatGPT or Claude and access their own data as themselves through Auth and RLS.

A developer added SiteGPT's plugin extension to ChatGPT and got an interactive app dashboard rendered directly in the chat window.

Asking Sites in the chat box to build a tool makes it write and deploy an MCP server that becomes a plugin in your account, with no server or domain needed.

The new AgentKit skill converts an existing codebase into layouts and blocks an AI can safely manipulate, exposes them through an OAuth-protected MCP server, and lets ChatGPT or Claude edit landing page copy and layout in one sentence.

A diagram walkthrough of Plugin Extensions: opening partner app screens inside ChatGPT to view and edit alongside the conversation, and how it changes the way work gets done.

A prompt that walks through using t3code-mcp and OpenAI's Secure MCP Tunnel to give ChatGPT access to T3 Code on an always-on machine, covering install, login, tunnel setup, and tool discovery verification.

A GitHub repo gathering 50 ChatGPT plugin listings, 62 OpenAI plugin source packages, and 18 copyable workflow use cases to help build a ChatGPT agent that actually does work.

An OpenAI staffer's DevDay talk covers plugin extensions that open from ChatGPT's sidebar, custom file viewers, onboarding skills, and Sign in with ChatGPT, with links to the spec and developer docs.

Payments service Canopy offers an MCP endpoint that lets ChatGPT, Claude, Cursor, or a custom agent create deposits, list chains and tokens, fetch deposit addresses, and track settlement.

A daily video ranking of GitHub AI repos by 24-hour star growth lists the top five and a breakout project, with openai/mcp-extensions up 17,071 spots.

A developer notes that distribution has shifted from pulling users into a website and dashboard to building an MCP server whose widgets render inside Claude and ChatGPT.