ChatGPT MCP and Apps: extensions you can try

MCP Apps is notable not because ChatGPT can render widgets, but because an MCP server can ship ui:// interface resources alongside its tools, turning bookings, approvals and dashboards into clickable components instead of plain text.

Apper and CyreneAI launched a challenge to connect Apper MCP to ChatGPT or Claude, build an app, connect its database and publish it live, with rewards for submitted entries.

Agentis's week 3 hackathon update adds a remote MCP server so users can connect ChatGPT, Claude and others to its agent, plus ENS domain support for publicly identifiable agent wallet names.

A developer built an MCP server with the mcp-use SDK in an evening, getting typed tools and React panels rendered inside ChatGPT from a single file, but hit snags with the cloud layer and malicious version flagging.

A Docker image packages the classic The Stock Market Barometer as an MCP server combining RAG, skills and 112 Python tools, with local Ollama for embeddings.

OpenAI released the open-source mcp-extensions library so independent developers can write plugins for ChatGPT, and one developer says their plugin's traffic surged on September 30.

An open-source MCP server connects ChatGPT to a local machine so it can run macOS commands, edit code, run git and test projects, saving cloud agent credits.

The open-source MCP server lets ChatGPT inspect a repo, edit code, run tests, commit, push and open PRs, while image and sprite generation stays on the local machine to save usage.

Using DevDay's MCP Extensions, adding openai/ui entrypoints to a tool's _meta makes a plugin panel appear in the Codex sidebar, and the author gives a three-step setup.

The author argues that combining dots, ChatGPT Space, Sites (backed by D1) and Plugin Extensions lets project tracking and documentation live entirely in ChatGPT, though it requires deciding how far to bet on OpenAI.

An open-source TradingView MCP server gives ChatGPT, Claude, Cursor and other clients technical indicators, screeners, strategy backtesting, and news and sentiment data.

The author found that Codex's computer use is a local MCP server inside the ChatGPT Mac app, and shares a prompt for registering it with Claude Code for browser testing.