How to Vibe Code the Right Way: Plan First, Then Let It Rip

Every guide to vibe coding tells you to skip the planning. "Don't get bogged down in technical decisions, let the AI pick." "Iterate on bugs, not features." "Start prompting." That advice is right for exactly one afternoon and wrong for every afternoon after it. The way to vibe code that actually holds up is the opposite of what the tutorials teach: you plan first, then you let it rip.

That sounds like a contradiction, because "vibe" is supposed to mean no plan. It isn't. The vibe is the part where the agent writes the code and you never touch a syntax error. The plan is a paragraph of plain English you write before that, and it is the single thing that separates a project you can keep building from one that turns into a pile you are scared to touch. This post is the method: how to vibe code the right way, step by step, without giving up the speed that made you fall in love with it.

#The hypothesis: the plan is the vibe, not the enemy of it

Here is the claim this whole post rests on, stated so you can argue with it. The failure mode of vibe coding is not bad code. It is undefined intent. The fix is not less vibe coding, it is a two-minute plan written before the agent starts, so the agent builds against something instead of guessing.

Watch what the audience actually does when nobody is scripting them. On r/GithubCopilot, a builder describing their real workflow wrote:

"I plan directly in agent mode, discussing design options, asking clarifications, reviewing and requesting changes, all that as it creates and updates the design document (.md). Then only when I agree with the plan, will I ask to start the implementation."

That is not a beginner following a tutorial. That is someone who got burned and worked their way back to planning first, on their own. They are not the exception. They are the pattern underneath every "how I finally got vibe coding to work" thread. The people shipping real things with agents almost always plan before they build, and the people hitting a wall almost always don't.

#Step 1: Say what you are building, not just what you want

The first move is the one the tutorials skip. Before you prompt for code, write one short paragraph that answers three questions: what is this feature, who uses it, and how do you know it worked. Not a spec document. A paragraph. But a specific one.

The difference is the entire game, so look at it side by side.

Vibe: "Build me a habit tracker with login."

Planned: "Build a habit tracker. A signed-in user can create a habit with a name and a daily or weekly frequency, mark it done for today, and see a streak count. Only signed-in users reach the tracker; signed-out users go to /login. The done button has to save so the streak survives a refresh."

The second one is not slower to think of. It is the same idea, said out loud with the edges filled in. And every one of those edges is a place the vague version would have let the agent quietly invent an answer you didn't want. Streak survives a refresh, signed-out users redirect, frequency is daily or weekly. Those are not technical decisions you delegated to the AI. Those are product decisions only you can make, and if you don't make them, the agent will, and it will make them differently every time you regenerate.

#Step 2: Let the agent build against the plan, and actually let go

Now you vibe. This is where the tutorials are right. Hand the agent your paragraph, let it write the code, let it host and preview, and do not read every line. Karpathy's original framing, where you "fully give in to the vibes" and "forget that the code even exists", is completely correct here, because the plan is doing the job that used to require reading the code. You are not trusting the agent blindly. You are trusting it against a written standard you can check the result on.

This is the part people get backwards. They think planning means micromanaging the agent. It is the reverse. The clearer your paragraph, the less you have to babysit the build, because the agent has something to be right or wrong about. Vague inputs are what force you to hover over every generation, because with a vague input the only judge of "correct" is your gut, in the moment, one prompt at a time.

#Step 3: Check the result against the plan, not against your vibe

When the preview comes back, you have a definition of done sitting right there in your paragraph. Go down it. Does a signed-out user actually hit /login, or did the agent build the page and forget the guard? Does the streak survive a refresh, or does it reset because "save" meant something looser than you assumed? This is the step that makes vibe coding safe, and it is the step the "iterate on bugs" advice quietly deletes.

Iterating on bugs sounds fine until you notice what it means: you only fix what you happened to see break. The behaviors you didn't think to click never get checked, so they rot in silence and surface three features later as the regression you can't explain. A commenter on Hacker News put the healthy version of this in one line:

"You can make good software with agents, if you exhibit good judgement and put yourself in the path as a gate on quality."

Being the gate is the whole job. Not writing the code, not reviewing every line, but standing at the point where "the agent says it's done" meets "it actually does what I said," and only letting through the things that match. A plan is what makes that gate possible, because without a written definition of done you are not a gate, you are just a person hoping.

#Where this breaks, honestly

This method has a real cost, and pretending otherwise would make it a worse method. Writing the paragraph feels like friction at the exact moment you are most excited to just start. On the same threads where builders praise planning, others push back: "like I was chatting and writing md files 80% of the time instead of actually getting stuff done." That complaint is legitimate. If you turn planning into ceremony, into a folder of design documents you maintain by hand, you have traded one mess for a slower one.

So the rule is proportion. The plan should be roughly one paragraph per feature, not a document. It exists to define done, not to impress anyone. The moment it grows into homework, you are doing it wrong in the other direction. Keep the speed, lose the mess, and the plan is one paragraph. If you find yourself writing specs for a throwaway script or a landing page you will delete next week, stop. Disposable work does not need a plan. This method is for the stuff that has to still work next month.

#What changes for you

If you are building something real in Cursor, Lovable, Claude Code, or Replit right now, here is the concrete implication. Your first two features will feel incredible either way, plan or no plan. The difference shows up at feature three or four, when the agent starts editing a system it can no longer fully see. With no written record of what each earlier feature was supposed to do, it breaks load-bearing behavior it didn't know was load-bearing, and you spend your afternoons chasing regressions instead of shipping. That is the three-month wall, and the paragraph you wrote in Step 1 is what keeps the agent from walking you into it. We wrote the full autopsy in why your AI agent keeps breaking things that worked.

This is exactly the gap BrainGrid is built to close, and it is built to do it without the "writing md files 80% of the time" tax. You describe the feature in plain English, and BrainGrid's Planning Agent asks the clarifying questions you would have skipped, then turns your idea into a requirement with explicit acceptance criteria: the conditions that have to be true for the feature to count as done. From there you build in BrainGrid's managed sandbox with a live preview, or in your own GitHub repo with Claude Code, Cursor, or Codex over MCP. The Builder Agent works against the criteria, and a feature is not finished until every one is verified with evidence. The loop is Plan, Build, Verify, Repeat. Vibe coding is that loop with Plan and Verify deleted. Put them back and you keep the whole vibe.

#The right way, in one line

Vibe coding done right is not less vibe. It is a plan the agent can build against and a definition of done you can check the result on, wrapped around the same fast, code-you-never-read loop you already love. Plan the feature in a paragraph. Let the agent rip. Gate the result against what you wrote. That is the difference between a demo you abandon and a product you keep. If you are still assembling your toolkit, start with our guide to vibe coding tools, then decide whether vibe coding is good for what you are building.

#FAQ

#How do you actually vibe code, step by step?

Write one plain-English paragraph defining the feature: what it is, who uses it, and how you will know it worked. Hand that to an AI agent like Claude Code, Cursor, Lovable, or Replit and let it write and preview the code without you reading every line. Then check the result against your paragraph, point by point, and only accept the parts that match. Plan, build, check. The plan is what makes the "don't read the code" part safe instead of reckless.

#Is vibe coding good for beginners?

It is a great on-ramp if you use it to learn rather than to avoid learning. The trap for beginners is skipping the plan and treating a working preview as a finished product. Write the short paragraph first, ask the agent to explain what it built, and check the result against what you asked for. That turns vibe coding from a way to ship things you don't understand into a way to build things you do.

#Is ChatGPT or Claude better for vibe coding?

Both can vibe code, and the model matters less than the method. Claude, through Claude Code, and agentic IDEs like Cursor are built for the full build-preview-iterate loop, while plain ChatGPT is stronger for planning and generating snippets you paste elsewhere. Whichever you pick, the thing that determines whether the result holds up is not the model, it is whether you defined what "done" meant before it started building.

#Do you have to plan before vibe coding?

For anything you intend to keep, yes. For a throwaway script or a page you will delete next week, no, planning is wasted effort there. The line is durability. The moment real people or real data depend on the software, a one-paragraph plan that defines done is what keeps the project from collapsing at the three-month mark. Below that line, skip it and enjoy the speed.

#What is the biggest mistake people make when vibe coding?

Letting the agent decide things they never noticed were decisions. When your prompt is vague, the AI silently picks the behavior for auth, edge cases, and state, and it picks differently every time you regenerate. The fix is to make those decisions yourself in a short written plan, so the agent is building against your intent instead of guessing at it, and so you have something concrete to verify the result against.

BrainGrid is the AI Product Planner that captures what "done" means before your agent builds, so you can vibe code fast without the three-month mess. Try it at braingrid.ai.