API & Integration Engineering

For backend engineers: make every API you build or consume survive production. — built in-house by Skill Me.

Reach for this when an integration has to be bulletproof - payments that can't double-charge, webhooks you don't control, third-party APIs that throttle or fall over, and contracts that change under you. It turns the hard-won production patterns into skills: idempotent writes, hardened webhook receivers, correct backoff under rate limits, circuit breakers and bulkheads for flaky upstreams, cursor pagination and delta sync, typed clients from OpenAPI, and date-pinned versioning with a real deprecation path. Install it before the integration that, if it breaks, pages you at 3am.

Install

• Claude, ChatGPT, Codex, Cursor (connector): install the whole pack from skillme.dev — one connection, then ask for any skill by name.
• As files for Codex, Cursor, or Claude Code: npx @skillme/cli add idempotency-enforcer webhook-receiver-hardener rate-limit-handler circuit-breaker-builder api-versioning-strategist pagination-and-sync-engineer api-client-generator api-design --target all
• With the skills CLI: npx skills add SkillMedev/api-integration-engineering
• Manually: copy any skills/<slug>/SKILL.md into .agents/skills/, .cursor/skills/, or .claude/skills/.

⭐ If this is useful, star the repo — it's how we gauge what to build next.

Skills in this pack

• Idempotency Enforcer — Designs client-supplied idempotency keys, deduplication storage, and replay semantics so at-least-once delivery and client retries return the first result instead of double-charging or double-shipping.
• Webhook Receiver Hardener — Hardens an inbound webhook endpoint so it verifies the sender signature on the raw body, resists replays, and acknowledges fast by persisting-then-enqueueing before any processing.
• Rate Limit Handler — Adds retry-with-backoff, Retry-After handling, and client-side throttling so a caller stays under an upstream API's rate limits instead of hammering it.
• Circuit Breaker Builder — Wraps flaky upstream dependencies in circuit breakers, aggressive timeouts, and per-dependency bulkheads so a slow or failing service degrades gracefully instead of cascading into a full outage.
• API Versioning Strategist — Produces an API version scheme (date-pinned header or URI), a breaking-vs-additive change policy, and a published deprecation/sunset timeline with translation shims.
• Pagination and Sync Engineer — Designs correct cursor pagination and incremental delta sync against a mutating dataset - cursor contracts, updated_at watermarks, delete propagation, checkpointing, and idempotent reprocessing.
• API Client Generator — Generates a typed API client from an OpenAPI/Swagger spec, with a hand-controlled transport wrapper for timeouts, auth, and typed errors.
• REST API Design — Designs REST API surfaces - resource naming, HTTP method and status-code semantics, error shapes, pagination, and filtering - and delivers an endpoint spec a consumer can build against without asking questions.
• OAuth & Auth Flow — Implements OAuth 2.0, JWT, and session auth correctly with security best practices. (external — see source)

License

MIT — see LICENSE. Skills are portable SKILL.md files; the canonical copies live in the Skill Me catalog.