ChatGPT MCP and Apps: extensions you can try

Max Stoiber advises developers to point their agents at the openai/mcp-extensions repo on GitHub and start with extensions to connect MCP servers to ChatGPT.

Morphic's MCP connector grew from 112 to 273 tools this month, added OAuth sign-in, and can now be called via custom MCP connections in ChatGPT, Claude and Cursor.

Federico Viticci notes that custom connectors can now be added directly, and that an MCP server with auth can be hosted on a ChatGPT Site or a Cloudflare Worker.

All users can now connect their own MCP servers via plugins → add → create custom MCP server, without enabling developer mode.

The author speculates that Binance's Agent OS MCP server could let tools like ChatGPT, Claude Code and Cursor access Binance market data and trading, though real-world performance still needs testing.

Muse has opened MCP submissions to its Connectors directory, requiring servers to match their website's capabilities and add more value, and the author estimates under 5% of current ChatGPT and Claude connectors would qualify.

Pasting one MCP URL into a custom connector gives ChatGPT, Perplexity and Cursor live market data and trading analysis.

A developer reports that no cloud-hosted ChatGPT session can subscribe to events from their self-built MCP server and wonders if it relates to a UK or enterprise account.

ChatGPT's MCP Events can subscribe to changes in connected tools and run actions automatically; it requires MCP 2.0, works in Work chats and the desktop app, and does not support polling or streaming.

Fulcra moves context out of individual apps into storage the user owns, letting multiple agents share the same health, calendar and location data over MCP.

An open-source MCP lets AI query a Calibre library to find quotes, analyze selections and make recommendations based on library metadata.

The author shows how a private plugin connects a self-built MCP to ChatGPT so drafts in their own voice can be written in the conversation, with a full video tutorial.