Clear instructions matter

Ava is a project manager at a consulting firm. She built a Gem to automate her weekly meeting notes with this system instruction: "Summarize my meetings clearly."

Three weeks in, Ava is frustrated. Monday's output was bullet points with action items. Wednesday's was a single paragraph. Friday's was a full-page narrative. Same type of meeting, wildly different formats.

What's the most likely reason her Gem behaves so inconsistently?