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Vibe Coding · レッスン

アイデアを説明する

漠然としたアイデアを実装可能なプロンプトに変えます。

「アイデアを説明する」はCoddyKit上の無料Vibe Codingレッスンです。 これはレッスン1/4です。 下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。 これはVibe Coding学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Vibe Codingコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

Your Idea Is the Starting Point

Welcome to your first real build! In vibe coding, everything starts with one thing: your idea. You don't need to know how to write a single line of code to begin. You just need to describe what you want clearly enough that an AI can build it for you.

In this lesson, you'll learn how to turn a fuzzy thought like "I want a little app" into a sharp, buildable prompt that tools like v0, Bolt, Lovable, or Cursor can actually run with.

Most Ideas Start Fuzzy

Your brain holds ideas as feelings, not specs. You might think: "something to track my water intake" or "a fun page for my dog." That's totally normal — that's where every project begins.

The problem? If you hand an AI a fuzzy idea, you get a fuzzy result. The skill you're building is taking that fog and shaping it into a clear request. The good news: AI can even help you do that shaping.

The One-Sentence Test

A great first step is the one-sentence test: can you describe your app in a single sentence? If you can, you have a buildable idea.

Format: "A [type of app] that lets [who] do [what]." This forces you to name the thing, the user, and the action.

A web page that lets a visitor type their name and shows a personalized welcome message.

A simple app that lets me track how many glasses of water I drink today.

A fun landing page that shows photos of my dog and a button that plays a bark sound.

Name the Three Pieces

Every buildable idea has three pieces hiding inside it. Pull them out and your prompt almost writes itself:

  • What it is — a web page, a to-do app, a quiz, a calculator.
  • Who uses it — me, a visitor, a customer, a student.
  • What they do — type something, click a button, see a result, save data.

If any piece is missing, the AI will guess — and guesses are how you get something you didn't want.

From Idea to Prompt

Let's transform a fuzzy idea into a real build prompt. Watch how we add the three pieces plus a tiny bit of look-and-feel.

Fuzzy: "a tip calculator." Buildable prompt below. Notice it names the screen, the inputs, the output, and the vibe.

Build a single web page tip calculator.

The user can:
- Type the bill amount in a number field
- Pick a tip percentage (10%, 15%, 20%) with buttons
- See the tip amount and the total update instantly

Style: clean and modern, centered card, friendly colors. Keep it to one HTML file.

Start Small On Purpose

Beginners often describe a giant app: "a social network with profiles, chat, payments, and a feed." AI might attempt it, but you'll drown in complexity on your very first build.

Instead, shrink the idea to its smallest fun version. You can always ask for more later — vibe coding is all about adding piece by piece. Your goal right now is one working screen you can see and click.

Too big (for now):
"Build a full recipe social network with login, comments, and search."

Right-sized first build:
"Build a single page that shows 3 recipe cards with a photo, title, and a Like button that increases a counter."

Let AI Help You Refine the Idea

Stuck turning your idea into a prompt? Ask the AI to interview you first. This is a powerful vibe-coding move: use the AI as a thinking partner before it builds anything.

Paste a prompt like the one below into Claude, ChatGPT, or your AI editor's chat. It will ask clarifying questions, then hand you a clean build prompt.

I want to build a simple app but my idea is still fuzzy.
Idea: "something to help me remember to take breaks while working."

Before writing any code, ask me 3-5 short questions to clarify what I want.
Then write a clear, single-paragraph build prompt I can give to v0 or Bolt.

Describe the Vibe, Not Just the Function

"Vibe coding" gets its name partly from this: you're allowed to describe the feeling you want, not just the features. AI is great at translating vibes into design choices.

Words like playful, minimal, retro, professional, cozy, neon guide colors, fonts, and layout. Add one or two vibe words to every idea so your app doesn't come out bland and gray.

Build a countdown timer page.
Vibe: calm and minimal, soft pastel background, big rounded numbers, gentle.

(Compare to the same app with vibe: "retro arcade, neon green text on black, blocky pixel font." Same app, totally different feel.)

A Tiny Peek at the Output

You won't write this by hand — but it helps to see what your words become. From a prompt like "a button that greets the user by name," an AI might generate a small piece of JavaScript like this.

You describe; AI produces this. Run it to see how a one-line idea becomes a working interaction.

function greet(name) {
  const who = name && name.trim() ? name.trim() : "friend";
  return "Welcome, " + who + "! Your app is alive.";
}

console.log(greet("Maya"));
console.log(greet(""));

Write Down Your Idea Now

Before moving on, capture YOUR idea using the template. Don't overthink it — a rough first version is perfect. You'll refine it as you build.

Fill in the blanks. This becomes the seed of the app you'll create across the next three lessons.

My app is a ______ (web page / to-do app / quiz / calculator)
that lets ______ (me / a visitor)
do ______ (type, click, see, save) ______.

Vibe: ______ (minimal / playful / retro / professional)
Smallest fun version: ______

Common Beginner Traps

As you describe your idea, dodge these classic traps:

  • Too vague: "make something cool" — AI has nothing to aim at.
  • Too huge: a full startup in one prompt — overwhelming on build one.
  • No user action: describing a screen but never saying what a person does on it.
  • Skipping the vibe: you'll get a gray, generic result.

A good idea description is clear, small, action-focused, and has a vibe.

Quick Check

Which of these is the best buildable idea for your very first AI-built app?

Recap: You Have a Buildable Idea

You learned to turn a fuzzy thought into a sharp, buildable prompt. Remember the essentials:

  • Pass the one-sentence test: a [type] that lets [who] do [what].
  • Name the three pieces: what it is, who uses it, what they do.
  • Start small — the smallest fun version wins.
  • Add a vibe so it doesn't come out generic.
  • Let AI interview you when the idea is still foggy.

Next up: handing this idea to an AI builder and generating your first working version!

よくある質問

「アイデアを説明する」レッスンは無料ですか？

はい。「アイデアを説明する」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Vibe Codingコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Vibe Codingコースには全4レッスンが含まれています。

「アイデアを説明する」で何を学びますか？

漠然としたアイデアを実装可能なプロンプトに変えます。 ブラウザで直接実行するハンズオンコードでVibe Codingを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

Vibe Codingを始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのVibe Codingは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。 これはレッスン1/4です。

「アイデアを説明する」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このVibe Codingレッスンでコードを書いて実行できますか？

はい。すべてのVibe Codingレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

このコースのすべてのレッスン

  1. アイデアを説明する
  2. 最初のバージョンを生成する
  3. 変更を依頼する
  4. プレビューして実行する
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