The description on the add-on's page was improved to make it clear that a local LLM server needs to be running locally at http://localhost:8080 otherwise the add on is not of much use.

Installation instructions for a local LLM server can be found here: https://github.com/vex21/sum-it-up?tab=readme-ov-file#sum-it-up

The add-on is still considered experimental as not everyone may want to run a LLM locally.