# 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. Source: https://learn.ynteractive.com/content/visual/term-ai-agent-explained · Updated 2026-10-01 · Free from Stepthrough (https://learn.ynteractive.com) [AI term explained](https://learn.ynteractive.com/content/visual#format-term-of-the-day) · 4 slides · [n8n](https://learn.ynteractive.com/content/tool/n8n) By [Robert Breen](https://learn.ynteractive.com/content/about) · Published October 1, 2026 · From the free lesson [n8n AI Agent Tutorial: Save Social Media Ideas to Google Sheets](https://learn.ynteractive.com/content/n8n-ai-agent-tutorial-google-sheets) 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. Swipe or scroll sideways for all 4 slides. The whole guide is written out below. ## 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?](https://learn.ynteractive.com/content/glossary/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 lesson](https://learn.ynteractive.com/modules/n8n-ai-agent) [Or read the full step-by-step guide](https://learn.ynteractive.com/content/n8n-ai-agent-tutorial-google-sheets) ## Related terms Plain-English definitions, each with an example from a free lesson. [AI agent](https://learn.ynteractive.com/content/glossary/ai-agent) · [API key](https://learn.ynteractive.com/content/glossary/api-key) · [Append row](https://learn.ynteractive.com/content/glossary/append-row) · [Brand voice](https://learn.ynteractive.com/content/glossary/brand-voice) · [Chat Trigger](https://learn.ynteractive.com/content/glossary/chat-trigger) · [Large language model (LLM)](https://learn.ynteractive.com/content/glossary/large-language-model) · [n8n](https://learn.ynteractive.com/content/glossary/n8n) · [OpenAI API](https://learn.ynteractive.com/content/glossary/openai-api) [The full AI glossary](https://learn.ynteractive.com/content/glossary) ## Related prompts - [Email subject lines prompt](https://learn.ynteractive.com/content/prompts/email-subject-lines-prompt): Get ten honest subject lines for a finished email, each with preview text and a character count, grouped by approach so you can… - [Social post ideas prompt](https://learn.ynteractive.com/content/prompts/social-post-ideas-prompt): A four-part ChatGPT prompt for social post ideas built on your services and real customer questions: platform, hook and call to… - [Client monthly report prompt](https://learn.ynteractive.com/content/prompts/client-monthly-report-prompt): Turn your agency's monthly numbers and work log into a client report: what changed, what you did, what's next. Every number… - [Decline a request politely prompt](https://learn.ynteractive.com/content/prompts/decline-request-politely-prompt): A ChatGPT prompt for saying no to a customer clearly and kindly: the no up front, one honest reason, a real alternative, and no… [All free prompt templates](https://learn.ynteractive.com/content/prompts) ## From the blog - [n8n Triggers Explained: Which One Starts Your Workflow?](https://learn.ynteractive.com/content/blog/n8n-triggers-explained): n8n triggers explained: schedule, Gmail, chat, webhook and form triggers, how to test each one, and how the trigger changes your AI Agent's prompt. - [What Is n8n? A Plain-English Guide for Business Owners](https://learn.ynteractive.com/content/blog/what-is-n8n): What is n8n? A plain-English guide to workflows, nodes, triggers and credentials, with three real small-business examples and what n8n costs. - [n8n AI Agent Tutorial: Build Your First Agent](https://learn.ynteractive.com/content/blog/n8n-ai-agent-tutorial): An n8n AI agent tutorial for beginners: chat trigger, AI Agent, OpenAI model, memory and a Google Sheets tool, built step by step and tested. ## More visual guides - [5 Steps to an n8n AI Agent That Saves to Google Sheets](https://learn.ynteractive.com/content/visual/5-steps-n8n-ai-agent-google-sheets): A visual guide: build an n8n AI agent that writes social media ideas and saves each one as a Google Sheets row, in 5 steps from the free lesson. - [Myth: An AI Model Looks Things Up Before It Answers](https://learn.ynteractive.com/content/visual/myth-ai-models-look-things-up): Myth vs fact: by default a large language model answers from its training plus your prompt. Web search or file lookup is a separate step. - [What Is a Context Window? A Visual Guide](https://learn.ynteractive.com/content/visual/term-context-window-explained): A visual guide to the context window: how much text an AI model can see at once, shown with a real ChatGPT meeting summary lesson. [All visual guides](https://learn.ynteractive.com/content/visual) · [All free tutorials](https://learn.ynteractive.com/content)