An AI agent is software that uses a large language model (LLM) to decide what steps to take toward a goal, and then carries out those steps using real tools — email, a CRM, a database, an API. A chatbot answers; an agent acts.
How an AI agent works
Every agent runs the same basic loop:
- Receive a goal — for example, "qualify this new lead and book a call if they fit".
- Reason — the model decides which tool to use next.
- Act — it calls that tool (look up the company, update the CRM, check a calendar).
- Observe — it reads the result and decides the next step.
- Finish or escalate — it completes the task or hands off to a person.
Agent vs chatbot vs automation
| Chatbot | Rule-based automation | AI agent | |
|---|---|---|---|
| Understands free text | Yes | No | Yes |
| Takes actions in other tools | Rarely | Yes | Yes |
| Handles unexpected inputs | Partly | No | Yes |
| Needs guardrails | Low | Low | High |
Where agents work well
- Lead qualification — read an enquiry, research the company, score it, update the CRM (for example HubSpot).
- Support triage — understand a ticket, answer from the knowledge base, escalate the rest.
- Back-office tasks — extract data from documents, validate it, file it.
Where to be careful
Agents should not have unlimited permissions. Good agent design limits which tools an agent may call, logs every action, and requires human approval for anything irreversible such as payments or deletions.
Getting started
Pick one repetitive, well-understood task with clear success criteria. Build an agent for that one task, measure it against how a person does it today, and expand only once it proves reliable. Not sure which task to start with? Our guide on which business processes to automate first gives you a simple scoring method.
How SystemLoom can help
We design and build AI agents and AI systems with the guardrails above built in — limited permissions, full logging and human approval where it matters. For a real example, see our AI restaurant table monitoring project, or book a free intro call to talk through your idea.
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