What Is an AI Agent? A Visual Guide
A visual guide to AI agents: AI that decides which steps to take and uses tools to take them, shown in a real n8n lesson, with tips to keep it safe.
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The guide in text
AI agent: An AI system that works toward a goal by deciding which steps to take and using connected tools to take them, rather than only replying with text.
Nobody tells it which node to run
You send: Yes, save those ideas to the sheet. The agent works out that saving means the Sheets tool and writes one row per idea.
Keep agents narrow
- Start with one job and one tool, then add more once it works.
- Say in the system message exactly when each tool should be used.
- Prefer safe actions (append a row, create a draft) over ones you can't undo.
The full definition: What is an AI agent? in the AI glossary, with an example from a free lesson, common confusions and tips.
Businesses and people in the examples are made up. The steps, screens and wording come from the free lesson and the Stepthrough glossary and prompt library.
Do it yourself, free
n8n AI Agent Tutorial: Save Social Media Ideas to Google Sheets. Build an AI agent for BrightPath Marketing that generates social media post ideas and saves them to Google Sheets — chat trigger, AI Agent, system prompt, model, memory, and the Sheets tool. You do every step yourself in a practice copy of n8n, it checks your work as you go, and “Do it for me” finishes any step you get stuck on. Free, and nothing touches your real accounts.
Start the free lessonRelated terms
Plain-English definitions, each with an example from a free lesson.
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