In Norse mythology, which feature was intentionally incorporated into the design of Thor's hammer Mjölnir that affected its usability?

Throughout mythology and folklore, certain artifacts were 'designed' with specific powers and purposes, becoming some of the most recognized 'products' in storytelling history. These items were carefully crafted with distinctive features and attributes that made them uniquely valuable and desirable - much like modern product design principles. Test your knowledge about these legendary items that exemplify early 'product design' thinking in mythology!

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It had an unusually short handle due to Loki's interference during its forging
It was designed with a chain attachment so Thor could swing it in circles for maximum impact
It featured inscriptions that changed color when storms approached
It was intentionally made heavy at the request of Odin to ensure only the worthy could lift it