✕ Close
← Chatbot or agent?

Level 8 · Lesson 61: What agents can and cannot do

Getting set up (with a grown-up) →
INTRODUCTION
Clever, not perfect
Agents are fast, but they can make mistakes.
press Enter ↵
Coding agent (pretend: scripted, not a real AI)

The agent waits for your prompt.

📁 Documents\my-site

No files yet.

Lesson 61: What agents can and cannot do

Level 8, Meet Your AI Coding Agent. Fast, but it can be wrong. Read every change. The new word: AI mistake. It follows lesson 60, Chatbot or agent?. Next comes lesson 62, Getting set up (with a grown-up).

What the lesson explains

Clever, not perfect. Agents are fast, but they can make mistakes.

Fast, not perfect. It writes code fast. It can still get things wrong. can write code fast; can be wrong; you check it.

What you do first

True or not?. Does an agent know everything? The answer: "No: it can be wrong".

The files on the practice computer

This lesson works in one folder. At the start, Documents\my-site holds images\, .gitignore, done.txt, footer.txt, ideas.txt, index.html, keys.env, secrets.txt, style.css, todo.txt.

Along the way you save style.css in Documents\my-site. Lesson 62 opens with the files just as you leave them.

What you practise

Try it, "True or not?": Does an agent know everything? The answer: "No: it can be wrong". Then: The agent says: Done, it works! What do you do? The answer: "Check it myself".

Fix it, "Read the diff": The pretend agent says: "I made the small titles teal for you." It asks to change index.html. The right answer is Deny (Look at the red and green lines: it changed your name, not a colour!).

Try it, "This time, right": The pretend agent says: "Sorry! Here is the right change: h2 titles in teal, in style.css." It asks to change style.css. The right answer is Allow: it does what you asked, and nothing more.

What PlayBuddy and PlayType say

PlayBuddy: "Agents are fast and clever, but they can still be wrong."

PlayType: "So you check every change, like a teacher checks homework."

Help in every lesson

Everything happens on a pretend computer in your browser, so nothing touches your real files. PlayBuddy and PlayType stand beside the board, cheer you on and say when it is your turn.

A green ring shows where to click the first time. After that you do it on your own, and if you slip twice the ring comes back.

Stars

The lesson has 4 things to do. Up to one slip in ten gives three stars, up to one in four gives two, and finishing always gives at least one. Stars and progress are saved in this browser only; there is no account.

About DayOneCode

DayOneCode is an independent learning site, not affiliated with or endorsed by Anthropic. Claude and Claude Code are trademarks of Anthropic.