Architecture spec, not a wish list
The generator names the framework, data layer and auth model explicitly, so Cursor stops inferring a different architecture in every file it touches.
TheMegaPrompt
Vision → gap analysis → ROI → stack → Mega-Prompt
The ultimate PRD & Mega-Prompt generator for Cursor
Generate a Cursor-ready PRD Mega-Prompt for apps and websites: architecture decisions, data model, roles and explicit non-goals you can paste into Composer or keep as project rules.
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Step 1 of 5 — Vision20%
Step 1 — Your product vision
Describe Your App, Website or Landing Page Idea
Plain words are perfect — no technical language needed. Who is it for, what do they do, and what should the first version of your app or website include?
Prompt qualityNothing yet
Start with one sentence: who is it for and what do they do with it? (0 words)
Smart defaults (saves build credits)
These are AI recommendations read straight from your description — adjust them only if something looks wrong. Anything you write later in the text always wins over these switches.
Making money (is this a paid product?)
Free / internal tools skip payments entirely and stay on $0/mo free tiers.
Write a couple of sentences about your idea to unlock the next steps.
How TheMegaPrompt builds PRDs and architecture specs for Cursor AI apps and websites
TheMegaPrompt turns five plain-language answers into a complete product requirements document: schema, roles, screens, non-goals and guardrails — written in the shape Cursor's agent follows most reliably for web apps and landing pages inside a real repository.
A schema Cursor can implement verbatim
Every table arrives with typed columns and access rules, which removes the invented-field bugs that surface only at runtime.
Roles and permissions defined up front
Admin, member and customer boundaries are written into the spec, so generated code checks permissions server-side instead of hiding buttons.
Explicit non-goals to stop scope drift
A 'do not build' list keeps agent runs bounded to the files and features you asked for, which is what prevents regressions across the repo.
How to use a structured PRD with Cursor
Cursor edits a real repository, so an unclear prompt does not just produce weak code — it spreads inconsistent assumptions across files. A PRD gives the agent a single source of truth to check every edit against for apps and websites.
1. Turn the PRD into project rules
Save the generated Mega-Prompt in your repo (for example as a rules or docs file) and reference it in Composer. Every agent run then shares the same architecture and naming.
- Keep the PRD in version control next to the code.
- Reference it explicitly at the start of each agent run.
- Update it when the product changes, not just the code.
2. Give the agent a file plan
Cursor is most reliable when it knows which files it is allowed to touch. An unbounded run refactors adjacent modules and introduces runtime errors far from the change you asked for.
- List the files or folders in scope for the task.
- State which modules must not be modified.
- Ask for a plan before edits on anything non-trivial.
3. Verify with the same contract you wrote
Because the PRD defines the schema, roles and behaviour, you can ask Cursor to check its own diff against it — a fast way to catch missing policies or invented fields before you run the app.
- Run typecheck and tests after each agent run.
- Ask the agent to diff its output against the PRD sections.
- Re-generate the Mega-Prompt here when scope changes materially.