Consistency Problem: Google Sheet AI Agent Tool Node [Update Operation]

Hey everyone—quick beginner question:
I’m automating Google Drive tasks and getting stuck on updating a Google Sheet. My current setup uses an AI-agent node linked to a Google Sheets tool, but the agent only sometimes writes to the sheet; other times it skips the action and returns an “empty array” error.
Could this be a missing node in the workflow? A prompt issue, or a problem with the Sheets tool itself? Should I rebuild the workflow from scratch?
Links:
Spreadsheet
Video
My current agent prompt:
“please update a specific name, last name email, number, mood or mark done if I ask you
update one cell at a time dont update the whole row
Note: if you don’t manage to update google sheet and get an ‘empty array’ please communicate that to the user.”