An AI agent is software you hand a goal to, not a question. It picks its own tools, takes an action, checks the result against the goal, and goes round again until the goal is met. ChatGPT gives you text back. An AI agent gives you finished work back. A chatbot responds. An AI agent decides and acts.
AI agent vs chatbot: what is the difference?
An AI agent does things for you; a chatbot tells you things. Tell an agent to go through your inbox, find the recent emails and reply to them, and it goes and does that.
| Chatbot | AI agent | |
|---|---|---|
| You give it | a question | a goal |
| You get back | an answer | finished work |
| It runs for | one response | as long as the goal takes |
| It needs | a prompt | a goal, a tool set and memory |
The loop is where the difference lives. The agent takes an action, then the model checks the result against the goal it was handed. Not finished, go round again. Finished, hand back the summary and stop. That back and forth is reasoning. The tool calls and the memory are what make it possible.
The three things every AI agent needs
- A goal. Stated clearly, action-oriented, with a specific outcome you can check when the AI agent claims it is done.
- A tool set. Gmail, a web search tool, whatever the job touches. The agent picks between them as it runs.
- Memory. Everything sitting around the tool and the goal: how your organisation uses that tool, what good practice looks like in your business, and what you learned the last four times you ran this. By the fifth run someone has written down what to do when it goes wrong. That is memory.
How an AI agent works, step by step
Hand an AI agent the goal “research 10 companies and draft some outreach” and the run looks like this.
- Take the goal: research 10 companies, draft outreach to each.
- Call the web search tool, which pushes keywords into Google and reads the results.
- Check progress against the goal. One company down, nine to go.
- Repeat steps 2 and 3 until all 10 are researched.
- Switch to the draft email tool and fill a template with what it found.
- Ten drafts later the goal is met, and the agent stops.
Two providers in one run: a Google tool at step two, a Gmail tool at step five. There are plenty of web search tools to choose from and the agent does not care which one you wire in.
Nothing about that shape is specific to sales. Swap the 10 companies for 10 solar customers due a post-install inspection and the loop is identical. An after-hours call comes in, the agent asks the qualifying questions and books the job. A list of overdue accounts goes in, and the agent works down it chasing each invoice. Same three ingredients, different goal and different tools.
A query you hand a chatbot is one task, even a fat one. An AI agent runs that task 50 times, which is the line between an agent and an automation.
What is a multi-agent system?
Two or more AI agents working the same job. Build one that drafts replies to inbound leads, build another that handles the marketing side, and the two start collaborating, with skills and workflows setting how they hand work over. Deeper in, an orchestrator decides who runs what. Nobody has to press a button to start any of it: a schedule, a cron job, is enough. Multi-agent systems pay off on complex work inside bigger organisations.
Should you build an AI agent or buy one?
An AI agent is a product you build. Finished agents exist to buy online and some of them will do the job, but most of the time nobody has built the one your business needs. ChatGPT is finished the moment you open it. Yours is not. Pick one job this week where you can state the goal in a sentence and check whether it is done. That is the one to build first.