How to Plan a Cursor Project Before You Start Coding

The 30-minute planning session that saves you 10 hours of fixing AI-generated code that went in the wrong direction.

The Problem With Jumping Straight Into Cursor

Cursor is a powerful AI coding assistant. It can write code fast. Very fast. That speed is also what gets you in trouble.

When you open Cursor with a vague idea — "build me a todo app with user auth" — the AI makes dozens of implicit decisions: which ORM, which auth library, whether to use TypeScript, how to structure the folders, what the database schema looks like, what the API routes are named. These decisions happen in the first 200 lines. By the time you notice one of them is wrong, you're 3,000 lines deep.

The fix is not to be more careful during the session. The fix is to be more intentional before the session. That's what project planning does: it forces the implicit decisions to become explicit, before you've invested hours of AI-generated code in the wrong direction.

What Happens When You Don't Plan

Here's the typical pattern:

1. Open Cursor with a rough idea
2. AI writes 200 lines of scaffolding based on its best guess
3. You review it, notice some things that are wrong but decide to fix them later
4. AI writes 500 more lines building on the scaffolding
5. The "fix it later" decisions are now load-bearing — changing them breaks 8 other things
6. You spend an hour refactoring instead of building features
7. You give up on the refactor and carry technical debt into the next feature

The Right Pre-Cursor Planning Process

Step 1: Write the Problem Statement (5 minutes)

Before you touch the IDE, write 2-3 sentences describing the actual problem this project solves. Not the feature list — the underlying problem. "Users who need X currently have to Y, which causes Z." This forces you to be specific about who you're building for and why.

Step 2: Define Your MVP Scope (10 minutes)

The MVP scope document has two parts: what's in, and what's explicitly out. The "out" list is often more valuable than the "in" list — it prevents scope creep before it starts.

Write out your MVP features as a numbered list. Then write a separate list of things that are explicitly out of scope. This second list becomes a constraint you can give to Cursor: "Do not implement any of these features."

Good MVP scope example:

• ✓ Single text input for rough idea
• ✓ Generate PRD, tickets, CLAUDE.md from idea
• ✓ Display in tabbed interface
• ✓ Copy-to-clipboard for each output
• ✗ User accounts (not MVP)
• ✗ Saved specs (not MVP)
• ✗ Team features (not MVP)
• ✗ Payment/subscription (not MVP)

Step 3: Declare Your Tech Stack (5 minutes)

Write down every technology you're committing to before Cursor suggests alternatives. This is non-negotiable: if you don't specify, the AI will choose. And it may choose differently than you would.

Include: language, framework, database, hosting, key libraries, and any libraries you explicitly don't want to use. "No ORM, raw SQL only" or "No TypeScript" or "Tailwind only, no custom CSS" are all valid constraints.

Step 4: Sketch the Data Model (5 minutes)

Even if you don't write SQL, sketch the main entities and their relationships in plain language. "Users have many Projects. Projects have one Spec. Specs have three fields: prd (text), tickets (JSON), claude_md (text)." This forces you to think through the structure before the AI implements it.

Step 5: Write the CLAUDE.md (10 minutes)

Take everything you've written above and format it as a CLAUDE.md file. This is the context document you paste at the top of your first Cursor session. See our complete CLAUDE.md guide for what to include.

The Minimum Viable Planning Doc

If you're short on time, here's the shortest planning doc that actually helps:

# [Project Name] — Cursor Session Brief

## What it is
[2 sentences]

## Tech stack
[List every tech choice]

## MVP: what I'm building today
[Bullet list of features]

## What I'm NOT building today
[Bullet list of explicit non-goals]

## Constraints
[Any hard constraints: no auth, no DB, etc.]

Five minutes to fill this out. This is the minimum viable brief that prevents the most common Cursor session problems.

Before Your First Prompt

When you open Cursor (or Claude Code), paste your project spec at the top of your first message. Not as a system prompt — as the first user message. Something like:

Here is the project I'm building. Please read this context before we start:

[paste your spec here]

Now, let's start by setting up the project structure. Please create the initial files...

This grounds the entire session in your spec. The AI will reference it implicitly throughout. When it tries to drift out of scope, you can redirect with "that's out of scope per our spec — let's stay focused on [in-scope feature]."

The Session Discipline

Planning is not a one-time thing. For longer projects, create a "session log" alongside your CLAUDE.md. At the end of each session, write 2-3 sentences about what was decided, what was built, and what's next. Start the next session by giving the AI the updated log.

This turns Cursor from a single-session tool into a persistent collaborator that remembers where you left off.

Related Resources

• How to Write a CLAUDE.md File
• The AI Coding Spec Template That Actually Works
• See a real SpecForge example output