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CodingAPI designadvanced

Pragmatic REST & GraphQL API Contract Architect

Design robust, backwards-compatible API contracts with clean error schemas, pagination, and idempotency keys.

#api-design#rest-api#graphql#idempotency#contract-design

Compatibility & Specs

Compatible AI Models
ClaudeChatGPTGemini
Last UpdatedApr 1, 2026
Customizable Variables4 parameters
Main Prompt Template

137 words • 1095 characters

You are a Principal API Architect and API Governance Director. I need to design a clean, backwards-compatible, and enterprise-grade API contract for [entity_domain] operations. API Paradigm: [api_paradigm] Primary Client Consumers: [client_consumers] Key Use Cases & Capabilities Needed: [api_use_cases] Deliver a complete production API contract specification: 1. Resource Schema / Type Definitions: Full TypeScript / GraphQL interface definitions with strict field nullability, scalar types, and descriptive field comments. 2. Endpoint / Mutation Design: Complete HTTP routes (verbs, paths, query parameters) or GraphQL queries/mutations following idiomatic naming conventions. 3. Idempotency & Concurrency Control: Exact headers (e.g. `Idempotency-Key`, `If-Match` ETag) and mechanics for safe payment/mutation retries. 4. Standardized Error Response Envelope: RFC 7807 Problem Details JSON format specifying machine-readable error codes, human messages, and field-level validation error arrays. 5. Cursor Pagination & Filtering: Efficient cursor-based pagination schema for large datasets.
Tip:Variables marked in purple brackets can be tailored below.

Customize Prompt

Fill in the variables below. Your customized prompt updates instantly in the browser — no AI API needed.

Parameters (4)* Indicates required field
[entity_domain]

The core business resource being managed

[api_paradigm]

RESTful JSON vs GraphQL

[client_consumers]

Who consumes this API

[api_use_cases]

Core operations clients must perform

4 parameters active
Live Customized OutputLive Preview
180 words
You are a Principal API Architect and API Governance Director. I need to design a clean, backwards-compatible, and enterprise-grade API contract for Subscription Billing & Invoice Management operations. API Paradigm: RESTful JSON (OpenAPI / JSON Schema) Primary Client Consumers: External B2B developer integrations and internal React web dashboard Key Use Cases & Capabilities Needed: 1. Create recurring subscription with custom billing cycle; 2. Paginate invoices filtered by status and date range; 3. Void/refund invoice with idempotent retry; 4. Update payment method. Deliver a complete production API contract specification: 1. Resource Schema / Type Definitions: Full TypeScript / GraphQL interface definitions with strict field nullability, scalar types, and descriptive field comments. 2. Endpoint / Mutation Design: Complete HTTP routes (verbs, paths, query parameters) or GraphQL queries/mutations following idiomatic naming conventions. 3. Idempotency & Concurrency Control: Exact headers (e.g. `Idempotency-Key`, `If-Match` ETag) and mechanics for safe payment/mutation retries. 4. Standardized Error Response Envelope: RFC 7807 Problem Details JSON format specifying machine-readable error codes, human messages, and field-level validation error arrays. 5. Cursor Pagination & Filtering: Efficient cursor-based pagination schema for large datasets.
Launch in:
ChatGPTClaudeGemini

How to Use This Prompt

Follow this 3-step workflow to extract high-signal responses from any compatible AI model.

01

1. Tailor the Parameters

Use the interactive customizer above to substitute the bracketed placeholders with your exact context, requirements, and constraints.

02

2. Send to AI Model

Copy the prompt and paste it into Claude, ChatGPT, Gemini, or Copilot. These models follow structured multi-step constraints reliably.

03

3. Review and Iterate

Review the output against the verified benchmark below. Follow up in the conversation to stress-test edge cases or refine tone.

Prompt Variables & Parameters

Reference breakdown of every dynamic variable embedded in this prompt template.

PlaceholderParameter NameTypeStatusDescription & Guidance
[entity_domain]Entity Domain / ResourcetextRequiredThe core business resource being managedDefault: Subscription Billing & Invoice Management
[api_paradigm]API ParadigmselectRequiredRESTful JSON vs GraphQLDefault: RESTful JSON (OpenAPI / JSON Schema)
[client_consumers]Client ConsumerstextRequiredWho consumes this APIDefault: External B2B developer integrations and internal React web dashboard
[api_use_cases]Key Use CasestextareaRequiredCore operations clients must performDefault: 1. Create recurring subscription with custom billing cycle; 2. Paginate invoices filtered by status and date range; 3. Void/refund invoice with idempotent retry; 4. Update payment method.

Example Execution & Benchmark Output

Sample input arguments and the verified AI response demonstrating expected quality and formatting.

Sample VariablesInputs
[entity_domain]
Subscription Billing & Invoice Management
[api_paradigm]
RESTful JSON (OpenAPI / JSON Schema)
[client_consumers]
External B2B developer integrations and internal React web dashboard
[api_use_cases]
1. Create recurring subscription with custom billing cycle; 2. Paginate invoices filtered by status and date range; 3. Void/refund invoice with idempotent retry; 4. Update payment method.
Expected AI ResponseVerified Result
### 1. Standardized Error Envelope (RFC 7807 Compliant) ```json { "type": "https://api.example.com/errors/invalid-parameters", "title": "Validation Failed", "status": 422, "detail": "One or more fields in your request payload failed validation.", "instance": "/invoices/inv_99824/void", "code": "INVALID_FIELD_VALUE", "invalidParams": [ { "name": "reason", "reason": "Reason code must be one of: 'fraudulent', 'customer_request', 'duplicate'" } ] } ``` ### 2. Idempotent Void Mutation Endpoint `POST /v1/invoices/{id}/void` - **Required Header:** `Idempotency-Key: idemp_938fa2...` - **Request Body:** `{"reason": "customer_request", "memo": "Accidental double charge"}` - **Idempotency Guarantee:** If network disconnects, resending the identical key returns original 200 response without double-voiding.

Best Use Cases

Scenarios and roles where this prompt produces maximum leverage.

Backend teams establishing consistent API standards before writing route handlers
Companies exposing public developer APIs requiring strict versioning and error standards
Full-stack developers transitioning from ad-hoc JSON endpoints to structured REST contracts

Tips for Best Results

Techniques to elevate response fidelity

  • •Provide rich background context rather than one-sentence inputs to receive deep, non-generic responses.
  • •Engage in multi-turn conversation: use the initial output as a baseline, then ask the AI to sharpen specific sections.
  • •Prompt the model to highlight any hidden assumptions or missing trade-offs in its recommendations.

Common Mistakes to Avoid

Frequent failure modes and anti-patterns

  • •Giving minimal context and expecting nuanced, expert-level strategic output.
  • •Not validating factual references, citations, or statistical claims with verified primary sources.
  • •Skipping the customization step and pasting raw bracketed template variables into the AI chat.

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