Good list. One thing that helped with prompts 2 and 3: tell Copilot the column headers by name and the format, e.g. 'Sales is in USD, Date is dd/mm/yyyy'. A lot of wrong formulas come from dates stored as text, and Copilot won't always flag it. Before trusting any formula it writes, test it on three rows you can add up by hand, including one edge case like an empty cell or a region spelled differently. For the outliers prompt, ask it to list the row numbers and the rule it used, so you can check the logic instead of just accepting the highlight.