Chat vs. Prompt vs. Spec

Take a breath — this chapter is written to be read like a conversation, not a textbook, so it's easy to follow.

Let's Think About It for a Second

Chat is talking across the table — ask once, fix once. A prompt is the recipe card taped to the kitchen wall — you can read it again tomorrow. A spec is the sheet you write before opening a restaurant: what dishes you'll sell. In vibe coding you write the spec first. In an agent you set the goal first. In RAG you decide which files to search first. A prompt sits in the middle of all that. Lose it in the chat log and you won't find it again tomorrow.

Connect It to Everyday Life

"Shorten this paragraph" is chat. "Summarize a student's notes in 5 sentences, one example, no hard vocabulary" is a prompt. "Study Helper pulls 3 questions from notes and tries to answer itself before showing the answer" is a spec. Test it in chat first. Save it as a prompt if you'll reuse it twice. Write a spec once you're building an app. Don't open a restaurant without a recipe card.

• Chat = try it once
• Prompt = a reusable instruction
• Spec = the project's blueprint

Let's Try It Together

Use chat   → try one messy idea now
Use prompt → reuse the same job tomorrow
Use spec   → build an app or agent around it

You can tell chat, prompt, and spec apart.