production api blueprint builder
Turn product requirements into implementation-ready API contracts with security, validation, and operational constraints.
$5
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Claude Code
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Codex CLI
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Grok
Grok Bot+18 agentsproduction api blueprint builder
Example session with this skill installed
Design a REST API for a subscription-based SaaS platform where users can manage team members, billing plans, and API keys. Include idempotency for payments.
- Read your context and instructions
- Compiled the production api blueprint
I have designed the API blueprint for your SaaS platform, focusing on resource isolation between teams and safe payment processing via idempotency keys.
SaaS Platform API Specification
Resource Model
| Resource | Ownership | Lifecycle Notes |
|---|---|---|
Organization | Root | Top-level container for billing and members. |
Member | Organization | Linked to User; roles: admin, editor, viewer. |
Plan | System | Read-only for users; defines feature flags. |
ApiKey | Member/Org | Created by admins; hashed at rest. |
Endpoint Catalog
| Method | Path | Description | Constraints |
|---|---|---|---|
POST | /v1/orgs/{id}/subscriptions | Upgrade/change plan | Requires Idempotency-Key header. |
GET | /v1/orgs/{id}/members | List team members | Cursor-based pagination. |
POST | /v1/keys | Generate new API key | Secret shown only once on creation. |
Request Contract: Subscription Create
{
"plan_id": "uuid",
"payment_method_token": "string",
"coupon_code": "string (optional)"
}
Security & Operational Logic
Idempotency: All POST /subscriptions calls require an Idempotency-Key. Keys are cached for 24 hours. Subsequent requests with the same key return the original 201 Created response.
2.
Authorization: RBAC enforced at the middleware layer. Member resource access requires admin role within the specific Organization context.
3.
Error Handling: Standardized codes (e.g., insufficient_permissions, payment_failed, resource_not_found) with request_id for observability.
Next steps
- Review the
Idempotency-Keyheader strategy for integration with your frontend. - Define the specific feature flags associated with each
Plan. - Map these endpoints to your chosen OpenAPI/Swagger template.
Connects securely to your tools. The creator never sees your data.
About this skill
Vague API requirements often lead to inconsistent endpoints, weak security models, and breaking changes. This skill forces technical rigor by turning high-level product goals into implementation-ready service contracts with defined resources, validation rules, and operational constraints. ## What it does - **Resource Modeling** identifies domain entities, ownership structures, and lifecycle invariants. - **Contract Specification** defines stable request/response schemas and consistent error handling patterns. - **Security Engineering** maps authentication, authorization, and rate-limiting requirements to specific endpoints. - **Operational Planning** handles pagination, idempotency, concurrency, and versioning strategies. - **Phased Implementation** prioritizes a smallest coherent development sequence to reach a functional MVP. ## How it works 1. **Input Analysis** analyzes product workflows, actors, and core entities to identify domain boundaries. 2. **Resource Definition** maps stable resource boundaries and lifecycle states. 3. **Contract Drafting** specifies endpoint behaviors, validation logic, and failure modes. 4. **Constraint Application** adds layers for security, idempotency, and observability. ## Frameworks & tools This skill is language-agnostic and applies to REST, GraphQL, or gRPC architectures. It produces design specifications compatible with OpenAPI/Swagger, Postman, and backend frameworks like Node.js, Go, or Python. ## Why this beats prompting it yourself Generic prompts often ignore critical production details like idempotency keys, partial updates, and concurrency. This skill enforces a strict checklist covering failure modes and backward compatibility that basic LLM outputs typically skip. ## Use cases - Drafting a greenfield API for a new microservice or mobile app backend. - Auditing an existing API design to find security gaps or missing error paths. - Converting a PRD into a technical specification for a development team. - Standardizing API patterns across multiple internal services. ## Known limitations This skill focuses on architectural design and contracts rather than generating boilerplate code for specific frameworks. It requires clear product requirements or entity definitions to be effective.
Focuses on contract design and architectural specifications rather than writing functional boilerplate code. Requires initial context on domain entities to provide high-quality output.
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- 2
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- 3
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