You are using staging server - a separate instance of the ESP Component Registry that allows you to try distribution tools and processes without affecting the real registry.
# Component: HTS221 * Driver and definition of HTS221 humidity and temperature sensor * See [datasheet](https://www.st.com/resource/en/datasheet/hts221.pdf)
idf.py add-dependency "espressif/hts221^1.0.0"