# What is an AI agent?

> An AI agent is software that uses an AI model to pursue a goal on its own, using tools and checking its work. What it is, a worked example from ads and the limits.
- **Author**: Marxx
- **Published**: 2026-11-11
- **Category**: AI
- **URL**: https://marxx.ai/library-glossary/ai-agent

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An AI agent is software that uses an AI model to work toward a goal on its own. It reads data, picks a next step, uses tools to take it, and checks the result. A chatbot waits for each question. An agent keeps going until the job is done or it needs your approval.

## What an agent has

| Part | What it means | Ad example |
|---|---|---|
| Goal | The job you set | "Find my weakest ads" |
| Tools | What it can reach | Your ad account, a spreadsheet, Slack |
| Loop | Plan, act, check, repeat | Reads spend, ranks ads, rechecks |
| Limits | What it may not do | Read only, or ask before spending |

Many agents reach your tools through [MCP](/glossary/mcp), an open standard for connecting AI assistants to outside data.

## A worked example

You tell an agent: "Find my three ads with the highest cost per lead this week and draft new hooks for them."

It reads last week's spend and leads for four ads. Cost per lead = spend / leads.

| Ad | Spend | Leads | Cost per lead |
|---|---|---|---|
| A | INR 4,800 | 24 | INR 200 |
| B | INR 6,000 | 12 | INR 500 |
| C | INR 3,000 | 6 | INR 500 |
| D | INR 5,400 | 9 | INR 600 |

It picks D, B and C. It drafts three new hooks for each and posts them to you. It does not pause anything. You read, decide and approve. See [agentic marketing](/glossary/agentic-marketing) for the full idea and [best AI agents for advertising](/best/best-ai-agents-for-advertising) for tools.

## Limits to know

- Agents make mistakes. Check the numbers they quote.
- Start with read-only access. A [read-only MCP server](/glossary/mcp-server) lets an agent look but not change.
- Require approval for anything that spends money.
- Keep a log of every change.

A person still owns the offer, the budget and the brand.

Marxx has a hosted MCP server that puts your Meta and Google Ads accounts inside Claude and ChatGPT, and a Slack bot. See [the hosted MCP server](/mcp).

## FAQ

### Is an AI agent the same as a chatbot?

No. A chatbot answers. An agent also uses tools and takes steps, such as reading your ad account and drafting a fix.

### Is it safe to connect an agent to my ad account?

Begin with read-only access, ask for approval before any change, and check the log. Give write access only after you trust the results.

### Will agents replace media buyers?

They take over routine checks and reports. People still decide offers, budgets and brand.

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