What context do you most often forget when prompting AI?

I’m preparing to launch PromptForge AI Starter, a profession-first workflow for turning real work goals into structured AI prompts.

While building it, I noticed that weak results usually come from missing context rather than a lack of ideas. People often forget to specify the audience, constraints, source material, tone, or desired output format.

I’d love to learn from other makers and AI users: what important detail do you most often forget to include in a prompt?