Agent skill

backend-design

Design robust backend systems and APIs. Use when users ask to plan or implement services, data models, or integrations.

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npx add-skill https://github.com/nicholasgriffintn/claude-code/tree/main/skills/backend-design

SKILL.md

Backend Design Skill

This skill guides the design of reliable backend systems, APIs, and data models with clear trade-offs, strong correctness guarantees, and operational readiness.

Design Thinking

  • Scope: Identify core use cases, data flows, and integration points.
  • Constraints: Latency, throughput, availability, compliance, and deployment limits.
  • Data: Define entities, relationships, invariants, and lifecycle.
  • Reliability: Error handling, retries, idempotency, and consistency model.

Architecture Guidelines

  • API Design: Explicit contracts, versioning, validation, and error shape.
  • Storage: Choose stores based on access patterns and durability needs.
  • Performance: Indexing, caching, batching, and async processing.
  • Security: AuthN/AuthZ, least privilege, secrets handling, auditability.
  • Observability: Logging, metrics, tracing, and alerting signals.
  • Scalability: Stateless services where possible, clear scaling boundaries.

Output Requirements

Provide a clear backend plan or implementation that includes:

  • Data model and key invariants
  • API endpoints or service interfaces
  • Failure modes and recovery strategy
  • Performance and scaling considerations
  • Security and observability notes

Response Checklist

markdown
Backend Design Checklist

- [ ] Confirm requirements and constraints
- [ ] Define data model and invariants
- [ ] Specify API contracts and error shape
- [ ] Address failure modes and consistency
- [ ] Cover performance, scaling, and caching
- [ ] Include security and observability plans

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