Playable → Prototype Handoff: 5 Convert‑Ready Artifacts to Cut Contractor Time‑to‑First‑PR

Convert-ready artifacts sit between a clickable demo and production code: they are compact, executable, and unambiguous. Instead of asking "what did you mean here?", a contractor can run a stub, run an acceptance test, or import assets and produce a small mergeable PR.

This matters because onboarding time is driven less by goodwill and more by friction: unclear API boundaries, missing edge-case specs, and inconsistent assets create back-and-forth that delays a first PR. Make the first meaningful action deterministic (run tests, run stub server, import exports).

Export a small OpenAPI document that covers the endpoints used in the prototype flows (requests, response shapes, common error responses). Generate a stub server from that spec and include it in the repo so contractors can hit predictable endpoints while building UI.

Keep the spec focused: one path per prototype interaction, sample payloads for success and failure, and clear field-level notes where design intent matters (e.g., whether a string is an id or a user-visible label). The stub server lets front-end work proceed without backend availability or guessing about payload shapes.

Write 3–6 high-value acceptance scenarios in plain language (Gherkin/Cucumber style) that mirror prototype flows: happy path, a common edge case, and an error path. These are both living documentation and automated tests that fail until implemented—perfect for guiding a first PR.

Pair each scenario with a lightweight test harness that runs against the OpenAPI stub or the running app. This ensures contractors know what "done" looks like and reduces ambiguous QA cycles. The act of writing acceptance scenarios also surfaces missing business rules before code is written.

Provide a single, annotated Figma page (or equivalent) that contains final screens with callouts: component name, typography tokens, padding rules, interaction notes, and content variations. Avoid large unlabeled files—annotations are the fastest way to remove guesswork.

Alongside annotated mockups, include export presets and a simple assets manifest (file names, expected formats, pixel densities). Ship ready-to-import assets and a short script or instructions so contractors can regenerate optimized assets if needed.

A telemetry map is a compact, tabular list of events associated with prototype interactions: event name, trigger (button id / screen), properties (user_id, plan, item_id), and success/failure markers. This lets engineers wire analytics and observability consistently instead of guessing event names and payloads.

Include where events should flow (analytics vendor or internal endpoint), retention considerations, and which events drive acceptance tests or alerting. Telemetry tied to acceptance tests makes it possible to validate behavior in observability as part of QA.