Somewhere on your computer there is a note holding your best prompt. You know the one: the paragraph you paste into an AI chat at month-end, refined over months until the commentary comes out the way you like it — the format, the thresholds, the rule about never guessing. It is quietly one of the more valuable documents in your finance department, and it comes with a monthly toll: find the note, paste it in, re-attach the files, and spend twenty minutes reminding a very smart tool of things you told it thirty days ago.

If that sounds familiar, it is because this column has spent six weeks working exactly that way: bring the task to a chat window, explain it well, check the output. That workflow has one weakness, and it shows up on exactly the tasks finance does best — the ones that repeat. This week we fix it, using a feature most Microsoft 365 businesses already have sitting in the Copilot app: the ability to build your own agent, no code, in about an hour. We will build one that earns its keep in every finance department on the island — a variance commentary agent.

A prompt you write once: name and description, instructions, knowledge, and a starter prompt— your standard, written down and put on duty. (Branded graphic by PGH Consulting, LLC)