Vibe Coding · Lesson

Letting AI Write Commit Messages

Clear history without the effort.

Letting AI Write Commit Messages is a free Vibe Coding lesson on CoddyKit — lesson 3 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Vibe Coding learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Why Messages Matter

A commit message is a short note describing what you changed. It seems trivial — until you have 200 commits and need to find the one that broke your login page.

Good messages turn your history into a searchable timeline. Bad messages turn it into noise.

The great news: AI is fantastic at writing them. You barely have to think — you just have to ask the right way.

What a Great Message Looks Like

A strong commit message is short, specific, and starts with an action verb in the present tense:

Add dark mode toggle to settings
Fix broken image on homepage
Remove unused login code
Update button color to brand blue

Notice the pattern: Verb + what + (where). Anyone reading it knows exactly what happened.

The Verb Cheat Sheet

Most commits start with one of a few verbs. Run this to see the common ones and when to use each:

const verbs = {
  Add: 'a new feature or file',
  Fix: 'a bug or broken thing',
  Update: 'change existing behavior',
  Remove: 'delete code or files',
  Refactor: 'clean up code, same behavior'
};

for (const [verb, use] of Object.entries(verbs)) {
  console.log(verb.padEnd(9) + '-> ' + use);
}

Let AI Read Your Changes

The magic trick: AI tools can see your staged changes and write the message for you.

In Cursor, Copilot, or GitHub Desktop there's literally a "Generate commit message" sparkle button. It reads the diff and proposes a clear message instantly.

No more staring at a blank box wondering what to type. You stage, click generate, review, done.

The Generate Prompt

If your tool doesn't have a button, you can paste your changes into any AI chat with this prompt:

Here are the changes I just made (the git diff is below).

Write a single, clear commit message for them.
Rules:
- Start with a verb (Add, Fix, Update, Remove)
- Keep it under 60 characters
- Be specific about what changed

[paste your diff or describe your changes here]

Commit Message in the Command

Once AI gives you a message, it goes right into the commit command after -m:

For example, AI suggests "Add password reset link to login page". You commit it like this (AI will format the whole command for you):

git add .
git commit -m "Add password reset link to login page"

One Commit, One Idea

The best messages come from focused commits. If one commit changes the navbar AND fixes a bug AND adds a feature, no single message can describe it.

Rule of thumb: one logical change = one commit. Build the navbar? Commit. Fix the bug? Separate commit.

This makes messages easy to write AND makes it easy to undo just one thing later without touching the rest.

Good vs Bad in Action

Let's see why this pays off. Run this to compare browsing two histories when hunting for a bug:

const messy = ['fix', 'more stuff', 'update', 'changes', 'wip'];
const clean = [
  'Add user signup form',
  'Fix navbar overlap on mobile',
  'Update primary color to blue',
  'Remove old test page',
  'Add loading spinner to checkout'
];

console.log('Looking for the color change...');
console.log('\nIn the messy history: good luck.');
messy.forEach(m => console.log('  ' + m));
console.log('\nIn the clean history: found it instantly:');
clean.forEach(m => console.log('  ' + m));

Bigger Changes: Add a Body

For most commits, one line is enough. But for a big change, you can add a longer description (a "body") explaining the why.

The first line stays short; then a blank line; then details. AI handles this nicely. A prompt:

I refactored my entire checkout flow into smaller components
and fixed two bugs along the way.

Write a commit message with:
- A short summary line (under 60 chars)
- A blank line
- 2-3 bullet points explaining what changed and why

Conventional Commits (Optional)

Some teams use a style called Conventional Commits, where messages start with a type tag:

feat: a new feature
fix: a bug fix
docs: documentation only
chore: maintenance, no app change

Example: feat: add dark mode toggle. You don't need this as a solo beginner, but AI can format your messages this way if you ask — handy when you join a team later.

Your Effortless Habit

Putting it together, your commit-message habit looks like this:

Make one focused change
Stage it
Click "generate message" (or use the prompt)
Glance to confirm it's accurate, then commit

Five seconds of effort, a beautifully clear history forever. Future-you, your teammates, and even your AI assistant (which reads history for context) will all thank you.

Quick Check

Pick the strongest commit message.

Recap & What's Next

You can now keep a clean history with almost no effort:

Great messages = Verb + what + where, short and specific
AI can read your changes and write the message for you
Keep commits focused — one idea each
Add a body for big changes; use Conventional Commits on teams

Next lesson: Undoing Mistakes Safely — when something breaks, you'll recover lost work calmly, with AI walking you through it.

Frequently asked questions

Is the “Letting AI Write Commit Messages” lesson free?

Yes — the full text of “Letting AI Write Commit Messages” is free to read here on the web, and the Vibe Coding course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Vibe Coding course, upgrade to CoddyKit PRO.

What will I learn in “Letting AI Write Commit Messages”?

Clear history without the effort. You practise Vibe Coding with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Vibe Coding?

No prior experience is required. Vibe Coding on CoddyKit is structured for beginners through advanced learners; this is — lesson 3 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Letting AI Write Commit Messages” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Vibe Coding lesson?

Yes. Every Vibe Coding lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

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