The AI PRD generator
Not a blank template. The Define agent reads your validated research and writes a full product requirements document, scope, user stories, and acceptance criteria, that design and code build straight from.
The spec gap
Research without a spec goes nowhere
You have the research. Now someone has to translate it into a document the team can build from, scope, stories, edge cases, acceptance criteria. It's slow, easy to skip, and the first thing to rot the moment the product changes.
So teams either ship without a real spec or maintain one that no longer matches the code. The Define agent closes that gap: it writes the PRD from your research and keeps it wired to everything downstream, so the spec stays the source of truth instead of a stale artifact.
What the Define agent does
A PRD you could actually build from
Not a bulleted summary, a complete, structured requirements document with the parts that make a spec buildable rather than decorative.
Scope that holds
Defines the problem, goals, non-goals, and success metrics, so the team knows exactly what is in the release and what is deliberately out.
Real user stories
Generates user stories tied to your personas, each with a clear actor, action, and outcome instead of a vague feature list.
Acceptance criteria
Every story ships with testable acceptance criteria, so 'done' is unambiguous for design, engineering, and QA alike.
Scope-aware roadmap
Sequences the work into a sensible v1, fast-follows, and later phases, a plan you can actually execute against.
From research to a locked spec
Bring in the research
The Define agent reads the validated brief from the Research agent, market, personas, and positioning, so the PRD starts grounded in evidence.
Draft the full document
It writes the whole PRD: problem statement, scope, user stories, acceptance criteria, and success metrics, structured and editable end to end.
Refine and lock scope
Tighten stories, cut non-goals, and reorder the roadmap. When you approve it, the spec becomes the source of truth for design and code.
Want a quick draft first? Try the free PRD generator
Our free, no-signup PRD generator turns a short prompt into a solid lightweight PRD in seconds. It's the fast on-ramp, the Define agent inside ProductOS is the full version that reads your research and drives design and code.
Want the PRD grounded in your actual codebase rather than a blank prompt? See the AI PRD generator built on your code.
What's inside every generated PRD
Problem & goals
A crisp problem statement, target outcomes, and the metrics that define success for this release.
User stories
Persona-linked stories that describe real workflows, prioritized and ready to hand to design.
Acceptance criteria
Testable conditions per story so nothing ships half-defined or open to interpretation.
Scope & roadmap
Explicit in-scope and out-of-scope, plus a phased sequence from v1 to later releases.
Step two of the pipeline
The PRD is the hinge of the whole build
Research flows into it and design flows out of it. Because every later agent reads the same spec, your screens and your code stay traceable to the requirements, no game of telephone.
Frequently asked questions
What is an AI PRD generator?
An AI PRD generator writes a product requirements document for you, the scope, user stories, acceptance criteria, and success metrics that define what to build. ProductOS's Define agent generates a full PRD from your validated research so the spec is grounded in evidence, not guesswork.
Is there a free PRD generator I can try first?
Yes. ProductOS offers a free, no-signup PRD generator at /tools/prd-generator that produces a solid lightweight PRD from a short prompt. The Define agent inside ProductOS is the deeper version, it reads your market research and its output flows straight into design and code.
How is this different from writing a PRD in a doc?
A PRD in a doc is a dead end, someone still has to translate it into designs and code by hand. In ProductOS the PRD is live context: the design agent generates screens from it and the code agent builds against the same stories and acceptance criteria, so the spec and the product never drift apart.
Can I edit the generated PRD?
Completely. The agent gives you a strong first draft you can rewrite, reprioritize, and trim. Locking scope is a deliberate step you take, the AI drafts, you decide what actually ships.
Write a spec
Turn your research into a real PRD with scope, user stories, and acceptance criteria, then let the design and code agents build straight from it.