Prince of Post for ChatGPT

com.princeofpost/label-maker

Print a Royal Mail QR code (Vinted, eBay, ASOS returns) as a 6x4 shipping label at home.

client:ChatGPT transport:streamable-http tools:1

Install Prince of Post in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://princeofpost.com/mcp

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