Spec‑First Contractor Kit: 6 Artifacts to Hand a Contractor and Ship a Microfeature

A contractor needs two things: clarity on intent (what success looks like) and a machine-readable contract (what to build and how to test it). The Spec‑First Contractor Kit pairs concise human docs with machine artifacts so contractors can implement, generate stubs, and run tests without repeated clarification.

The six artifacts in the kit are: (1) 1‑page PRD, (2) OpenAPI stub (spec-first API contract), (3) acceptance tests (Gherkin/ATDD), (4) high‑fidelity mockups (key screens/components), (5) JSON‑LD feature card (metadata for product pages/API discovery), and (6) telemetry map (events, properties, and failure signals). Each artifact has a clear owner and purpose — together they reduce onboarding time and change orders.

Keep the PRD to one page: one‑sentence problem, target user, one‑line solution, success metrics (quantified), non‑goals, rollout plan, and acceptance test pointers. Use checkboxes for release criteria. Many modern PRD templates emphasize brevity and testability — adopt that discipline to make the rest of the pack actionable.

OpenAPI stub: define only the endpoints you need, example request/response bodies, and error codes. Mark required fields and include example JSON. A minimal OpenAPI contract is enough to generate server and client stubs and to validate acceptance tests. Spec‑first API development is standard practice for predictable integrations.

Write acceptance tests in Given‑When‑Then form. Each user story should have 2–5 testable scenarios (happy path, one edge, one error). These scenarios become both the contract for QA and the executable tests for CI. Use plain language and map scenarios back to specific OpenAPI requests and response assertions.

Produce 2–4 annotated mockups covering key states: initial, filled, success, and error. Annotations should call out data sources and validation rules so the contractor can wire the UI to the API contract without asking. Finally, include a JSON‑LD 'feature card'—a small structured snippet describing the feature, owner, and endpoints. JSON‑LD is lightweight, consumable by documentation systems, and useful for automated discovery and marketing pages.

A telemetry map turns unknown bugs into actionable signals. For a microfeature, list 6–12 events: entry points, success events, failure events, and critical edge cases. For each event include event name, triggering condition, key properties (IDs, error codes), retention priority (critical/optional), and who will act on it.

Ship instrumentation with the feature. Contractors should include telemetry hooks in the acceptance tests (assert success events fire) and in the OpenAPI error responses (include an error code property). This ensures that post‑release incidents are detectable and that your analytics team can measure feature value without retrofitting events later.

Create three scope tiers to hand to contractors: Quick (spec + OpenAPI stub + mockups), Standard (add acceptance tests + telemetry map), and Complete (everything plus 1 week of QA/fixes and delivery support). Price the tiers to reflect time saved on clarification: Quick is the smallest, Standard is your default, Complete is for mission‑critical launches where you want the least risk.

When handing off, bundle artifacts in a single folder or repo with a README that lists the delivery checklist and expected artifacts. Include a short playbook: how to run contract tests, how to generate stubs from the OpenAPI file, and where to push telemetry events in staging. This single‑click handoff approach reduces negotiation and accelerates a clean invoice‑to‑acceptance cycle.