Why this matters
Every vendor now says "AI agent". Your manager asks whether you should buy one, a colleague says you already have an automation, and someone else just uses ChatGPT. Without knowing the difference, you either pay for the wrong thing or keep doing by hand a job a tool could do.
The difference is not technical. A chatbot answers. An automation follows a fixed rule. An agent takes a goal and works out the steps. Each one is right for a different kind of job.
In this short module you watch all three handle one real office job, chasing six unpaid invoices, and see exactly where each one helps and where it goes wrong.
What you’ll build
Oak Hill Pet Grooming (made up) has six open invoices. Four are more than 14 days late, and one of those customers, Ben, already paid $60 of his $120. That one detail separates the three kinds of help.
A chatbot writes you a reminder template and leaves the rest to you. An automation sends the same reminder to everyone past the date, Ben included, for the full amount. ChatGPT’s Work mode, an AI agent, reads the list, does the date math, drafts three reminders, leaves them unsent, and flags Ben for a person to decide. You finish with a one-screen cheat sheet.
What you need
- Nothing to start the practiceChatGPT is a practice copy, and the automation and cheat sheet tabs are simple diagrams. Nothing is sent. The lesson is mostly reading.
- The invoice listSix rows: invoice number, customer, amount, due date, and a note on Ben’s partial payment. It is in the download below, inside the agent task.
- ChatGPT with Work mode, to try an agent for realchatgpt.com, or the ChatGPT desktop app. The Chat and Work switch is at the top of the page. How much you can use Work depends on your plan.
Concepts
3 ideas you’ll use in the practice.
A chatbot answers, and you do the rest
Ask a question, get an answer or a draft. Great for writing, ideas and explanations. But it only knows what you tell it, and the work after the answer (finding who is overdue, filling in names, sending each email) is still yours.
An automation follows your rule, every time
An automation has a trigger ("an invoice turns 14 days past due") and an action ("send the reminder"). It runs the same way day or night, which makes it cheap and dependable for repeat jobs, in tools like Zapier, Make or n8n.
It never uses judgment. Odd cases go through anyway, which is how Ben gets a reminder for money he already paid.
An agent takes a goal and works out the steps
An agent gets a goal instead of a script. It decides the steps, uses tools to carry them out, and makes small judgment calls along the way.
Give it four things, like a note to a colleague covering for you: the goal, the information it needs, the judgment calls you want ("if there is a partial payment, flag it"), and hard limits ("don’t send anything"). Then check what it made before anything goes out.
Practice
Do every step yourself in a practice copy of the real tool. It checks your work, and “Do it for me” finishes any step you get stuck on.
Do it for real
Now repeat it in your own account. Tick each step as you go.
Downloads
- Agent task and cheat sheet (.txt)The exact Work task from the lesson with the invoice list, and the chatbot, automation and agent cheat sheet.
Quick check
3 questions to check you’ve got it.
1. Copying every new website enquiry into a sheet, exactly the same way each time, needs:
- A chatbot
- An automation
- An AI agent
Show the answer
An automation. Same steps every time, no judgment needed: that is what an automation is for.
2. Why did the automation send Ben a reminder for the full $120?
- It was set up wrong
- It follows the rule and never uses judgment
- Ben asked for it
Show the answer
It follows the rule and never uses judgment. An automation does exactly what its rule says. Odd cases go through anyway.
3. Which line in the agent’s task is a hard limit?
- "Find every customer more than 14 days overdue"
- "Sign them Tara, Oak Hill Pet Grooming"
- "Don’t send anything"
Show the answer
"Don’t send anything". Limits say what it must never do on its own. Keep one on anything that reaches a customer.