Name the feature
Give the feature a short, specific name and describe what it must do.
STRUCTURED REQUIREMENT
Feature Requirement Builder
Turn a feature idea into a structured requirement with a clear functional requirement, key assumption, and explicit exclusions — ready for an AI coding assistant or a ticket.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
State the assumption and exclusion
Add the key assumption behind the design and what is explicitly out of scope.
Get a completeness score
Each of the four fields is checked for sufficient detail, producing a 0-100% completeness score.
Continue learning: Writing requirements AI coding tools can actually use
Frequently asked questions
Why does an exclusion matter as much as the requirement itself?
Unstated scope is the most common source of feature creep — writing down what's excluded makes the boundary explicit for both humans and AI coding assistants.
What makes a good key assumption?
Something that, if false, would change the design — like an assumed file size limit, user role, or data format. Vague assumptions like 'users will like this' don't help.
How is the completeness score calculated?
Each of the four fields (name, requirement, assumption, exclusion) contributes up to 25% based on whether it has enough detail (roughly 15+ characters), with partial credit for shorter answers.
Can I use this instead of a full PRD?
For a single feature, yes — it's a lightweight, structured requirement. For a full product, pair it with a PRD or one-page brief.
Should I fill this in before or after writing code?
Before — it's meant to clarify scope and assumptions ahead of implementation, especially when prompting an AI coding assistant.
How We Compare
| Feature | MVPHub | Notion | Linear |
|---|---|---|---|
| Structured requirement format | Included | Limited | Limited |
| Instant completeness scoring | Included | Not included | Not included |
| Forces explicit exclusions | Included | Not included | Not included |
| No setup required | Included | Limited | Included |
Linear and Notion can store a requirement in a ticket or doc, but neither scores completeness or prompts you to state exclusions explicitly.
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