Gumball for ChatGPT

io.github.thinkmojo/gumball

Ring a real siren light from your AI agent: spin it, play a sound, set the volume, mute it.

client:ChatGPT transport:streamable-http

Install Gumball in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://app.getgumball.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs