Acceptance‑Test‑First Microfeature Kit: PRD Blocks That Generate Tests, OpenAPI Stubs, and ASO Assets

Keep the PRD as structured, machine‑friendly blocks that directly map to test and spec outputs. Use five minimal blocks: Context (user + scenario), Behavior (steps the user takes), Acceptance Criteria (observable outcomes), API Surface (endpoints/data needed), and UI Copy (labels and short lines). Each block should be single‑purpose and short — 1–3 sentences or bullet points — so they can be reliably parsed or pattern‑matched by simple templates or small scripts.

Adopt conventions that reduce test fragility up front: include stable selectors (data-testid) references in Behavior, prefer observable outcomes over implementation details in Acceptance Criteria, and list explicit request/response fields in API Surface. This discipline makes the mapping from brief → test → stub deterministic and repeatable.

For Playwright acceptance snippets, translate Context + Behavior + Acceptance Criteria into a small test scaffold: a setup block (Context preconditions), step actions (Behavior), and assertions (Acceptance Criteria). Use standardized locators from the PRD (data-testid or aria labels) to avoid brittle selectors. Prefer high‑level assertions (visible text, element counts, URL fragments) that reflect user‑observable behavior rather than implementation details.

For OpenAPI stubs, convert the API Surface block into an OpenAPI operation object with basic request/response schemas. Use the fields listed in API Surface as properties on the request/response schema and mark required fields explicitly. Tools like Postman and OpenAPI Generator can generate server stubs and client code from these minimal specs, providing immediate runnable endpoints for test harnesses and developer onboarding.

Turn the same UI Copy and Acceptance Criteria into JSON‑LD feature cards (SoftwareApplication schema or custom feature properties) to power structured metadata on marketing pages and rich results. Keep each card short: headline (UI Copy title), short description (benefit line), and evidence (one measurable acceptance criterion). Embedding these cards on your landing pages makes feature content single‑sourced and easier to reuse in app store listings and marketing channels.

For ASO, map UI Copy to store fields: title, short description, and the first benefit bullet in the long description. Follow store rules (character limits and policy constraints) and avoid promotional claims that violate metadata policies. Use a single canonical copy file so translators, product, and growth teams pull the same language; that prevents drift between the app UI, marketing pages, and store listings.

Structure outputs around the microfeature name. Example folder layout for a 'share‑snippet' microfeature: /features/share-snippet/prd.yaml, /features/share-snippet/tests/share-snippet.spec.ts, /features/share-snippet/api/openapi.yaml, /features/share-snippet/seo/feature-card.jsonld, /features/share-snippet/aso/en.json. Keep prd.yaml as the single source of truth and derive the other files using simple generator scripts or templating (Mustache, Jinja, or small Node scripts).

Automate generation as part of your sprint start: when a PRD block is accepted, run the generator to emit tests and stubs, add them to the feature branch, and require the generated acceptance test to fail in CI until implementation arrives. This enforces the red→green discipline and reduces duplication across docs, tests, and store assets.

The biggest maintenance cost is fragile selectors and duplicated copy. Prevent this by making the PRD require stable anchors (data‑testids) and by centralizing copy in the PRD UI Copy block. When copy updates are required, change the PRD and re‑generate artifacts; treat store copy updates as a separate release step with QA for screenshots and metadata compliance.

Run a periodic regeneration job (quarterly or with each feature release) that diffs generated assets against committed files and surfaces divergence to product owners. That keeps JSON‑LD, OpenAPI examples, and ASO copy aligned with the shipped product and limits surprises during store reviews and developer handoffs.