OneLessTool for ChatGPT

com.onelesstool/onelesstool

Find software subscriptions you can drop using tools you already own, with vendor-verified prices.

client:ChatGPT transport:streamable-http tools:9

Install OneLessTool in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://onelesstool.com/api/mcp

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