{"slug":"ericrisco-api-design","name":"api-design","description":"Use when settling the contract of an API you expose, before implementation: resources/URLs, REST vs GraphQL, versioning, one RFC 9457 error envelope, pagination, idempotency — emitted as OpenAPI 3.1. NOT implementing the endpoints (that is `fastapi`/`nestjs`/`go`/`nodejs`), NOT auth hardening (that is `secure-coding`), NOT consuming a third-party API (that is `api-connector-builder`).","long_description":"---\nname: api-design\ndescription: \"Use when settling the contract of an API you expose, before implementation: resources/URLs, REST vs GraphQL, versioning, one RFC 9457 error envelope, pagination, idempotency — emitted as OpenAPI 3.1. NOT implementing the endpoints (that is `fastapi`/`nestjs`/`go`/`nodejs`), NOT auth hardening (that is `secure-coding`), NOT consuming a third-party API (that is `api-connector-builder`).\"\ntags: [api-design, rest, graphql, openapi, versioning, pagination, http, rfc9457, contract-design]\nrecommends: [fastapi, nestjs, go, nodejs, secure-coding, webhooks, api-connector-builder, code-review]\norigin: risco\n---\n\n# API design\n\n## Your one job\n\nYou design the **contract** an API exposes. You do not write the handler. The deliverable is a set of decisions a backend skill can implement directly: resource shapes, URLs, methods, the status-code map, one error envelope, pagination params, versioning rules — ideally captured as an **OpenAPI 3.1** document.\n\nWhen the user names a framework (FastAPI, NestJS, Go, Node), they own the build; you are pulled in for contract questions. Settle the contract first, then hand off (see [Handoff](#handoff)). Keep every decision framework-neutral: nothing here should mention an ORM, a router, or a DI container.\n\n## REST vs GraphQL vs hybrid\n\nPick on traffic shape, not fashion. Decide once, write it down.\n\n| Situation | Choose | Why |\n|---|---|---|\n| CRUD-ish resources, public API, HTTP caching matters | **REST** | URLs map to resources; CDN/proxy caching works on GET + ETag out of the box |\n| Many client shapes, deep nested graphs, mobile over-fetch is real | **GraphQL** | one round-trip, client picks fields; no N endpoints per screen |\n| Stable resource API + one rich read surface for a client app | **Hybrid** | REST for the system of record, a GraphQL read layer on top |\n\nOperational gotcha that decides monitoring: **GraphQL returns HTTP 200 even when a field errored** — failures live in an `errors[]` array next to partial `data`. Your dashboards cannot alert on 5xx; you must alert on the `errors[]` payload. REST signals failure with the HTTP status itself. If your ops team lives on status-code SLOs, that is a point for REST. Schema/nullability design, mutation and error-union conventions, and this error model in full: [`references/graphql-design.md`](references/graphql-design.md).\n\n## Resource & URL modeling\n\nResources are **nouns**; HTTP methods are the verbs. Never put a verb in a path.\n\nRules, each with its reason:\n- **Plural collections, consistent everywhere** — `/projects`, `/projects/{id}`. Pick plural and never mix singular in; inconsistent naming is the most-cited design smell.\n- **Nest sub-resources one level** — `/projects/{id}/tasks`. Deeper than one level (`/projects/{p}/tasks/{t}/comments/{c}`) gets unreadable; link to the flat resource instead (`/comments/{c}`).\n- **Methods carry intent** — `GET` read, `POST` create, `PUT` full replace, `PATCH` partial update, `DELETE` remove. A path never says what it does.\n- **Filter/sort/select via query string, not new paths** — `?status=open&sort=-created_at&fields=id,title`. One `GET /projects` handles all of it; don't mint `/projects/open` and `/projects/byDate`.\n\n| Bad | Good | Why |\n|---|---|---|\n| `POST /createProject` | `POST /projects` | the method is the verb |\n| `GET /getUserOrders/{id}` | `GET /users/{id}/orders` | noun hierarchy, no verb |\n| `GET /project` and `GET /tasks` | `GET /projects` and `GET /tasks` | one plural convention |\n| `GET /projects/active` | `GET /projects?status=active` | filter is a query param |\n| `POST /projects/{id}/delete` | `DELETE /projects/{id}` | method, not path segment |\n\nFull query grammar (filter operators, sparse fieldsets, sort syntax), content negotiation, rate-limit headers and a HATEOAS note: [`references/rest-conventions.md`](references/rest-conventions.md).\n\n## Status codes that matter\n\nYou need a small map, used consistently. Don't overload 200.\n\n```http\n200 OK            # read / update succeeded, body returned\n201 Created       # resource created — include Location: /projects/{id}\n202 Accepted      # async accepted, not done — return a status URL\n204 No Content    # success, nothing to return (e.g. DELETE)\n400 Bad Request   # malformed syntax / unparseable\n401 Unauthorized  # not authenticated — who are you?\n403 Forbidden     # authenticated but not allowed — I know you, no\n404 Not Found     # resource absent (or hidden from this caller)\n409 Conflict      # state collision — duplicate, version mismatch\n422 Unprocessable # syntactically fine, semantically invalid (validation)\n429 Too Many Req  # rate limited — include Retry-After\n5xx               # your fault, never the client's; never leak the stack\n```\n\nTwo distinctions agents get wrong:\n- **401 vs 403** — 401 means *unauthenticated* (no/invalid credentials); 403 means *authenticated but unauthorized*. Returning 401 on a permission failure leaks that re-auth might help when it won't.\n- **409 vs 422** — 409 is a *state* conflict (the request fights the current server state: dup key, stale version). 422 is a *content* problem (the body parses but fails business rules). Full status-code table with when-each in [`references/rest-conventions.md`](references/rest-conventions.md).\n\n## Error envelope: RFC 9457\n\nOne error shape across **every** endpoint. Adopt **RFC 9457 Problem Details** (the current standard; it obsoletes RFC 7807). Media type `application/problem+json`. Standard members: `type`, `title`, `status`, `detail`, `instance`, plus your own extension members.\n\n```json\n{\n  \"type\": \"https://api.acme.com/problems/validation-error\",\n  \"title\": \"Your request parameters didn't validate.\",\n  \"status\": 422,\n  \"detail\": \"due_date must be in the future.\",\n  \"instance\": \"/projects/8a3/tasks\",\n  \"errors\": [\n    { \"field\": \"due_date\", \"message\": \"must be in the future\" }\n  ],\n  \"correlation_id\": \"req_01H...\"\n}\n```\n\nRules:\n- **`type` is a stable, machine-readable URI** — clients branch on it, not on `detail`. Never change a `type` string once published.\n- **`title` is human, generic per type; `detail` is human, specific to this occurrence.** `detail` is for people, not parsers.\n- **Always carry a correlation/request id** (extension member) so a support ticket maps to a log line.\n- **Never leak internals** — no stack traces, SQL, internal hostnames, or raw DB ids in `detail`. That is both an information leak and a coupling leak.\n\n## Pagination\n\nDefault to **cursor (keyset)** pagination. Use offset only for small, bounded sets.\n\n| Approach | Use when | Why |\n|---|---|---|\n| **Cursor / keyset** | large or changing datasets, feeds, anything hot | opaque token over an indexed ordered column → constant-time, stable across inserts |\n| **Offset / limit** | small bounded admin lists, fixed reference tables | simple, but the DB scans-and-discards skipped rows (degrades with depth) and **skips or duplicates rows** when data shifts between page loads |\n\nDecision line: if the list can grow unbounded or rows can be inserted between page fetches, use cursor.\n\nREST cursor envelope — same keys on every list endpoint:\n\n```json\n{\n  \"data\": [ { \"id\": \"...\", \"title\": \"...\" } ],\n  \"next_cursor\": \"eyJpZCI6MTI4N30\",\n  \"has_more\": true\n}\n```\n\nThe next page is `GET /projects?cursor=eyJpZCI6MTI4N30&limit=50`. The cursor is opaque — clients must not parse or construct it.\n\nGraphQL has its own de-facto standard: **Relay Connections** — `edges { node, cursor }`, `pageInfo { hasNextPage, endCursor }`, args `first` / `after`. Use it; don't invent a bespoke GraphQL pagination shape. See [`references/graphql-design.md`](references/graphql-design.md).\n\n## Versioning & evolution\n\n**Prefer additive, non-breaking evolution over a new version.** A new version forks your client base and your maintenance. Most changes don't need one.\n\n- **Non-breaking (no version bump):** adding an optional field, adding a new endpoint, adding a new optional query param, adding a new enum value clients are told to tolerate.\n- **Breaking (needs a version):** removing/renaming a field, changing a type, making an optional field required, changing status-code semantics, changing the error `type` for a case.\n\nWhen you must version, **use a URL path version (`/v1/...`) for public APIs** — it is visible, cacheable, trivially testable in a browser, and the most common convention clients expect. Header/media-type versioning (`Accept: application/vnd.acme.v2+json`) keeps URLs clean but is harder to test and cache; query-param versioning (`?version=2`) pollutes every URL. Default to path.\n\nDeprecate gracefully with the `Deprecation` and `Sunset` response headers so clients get programmatic warning before removal:\n\n```http\nDeprecation: true\nSunset: Sat, 31 Oct 2026 23:59:59 GMT\nLink: <https://api.acme.com/v2/projects>; rel=\"successor-version\"\n```\n\nFull breaking-vs-non-breaking matrix, the three versioning mechanisms and the deprecation/sunset workflow: [`references/versioning-and-evolution.md`](references/versioning-and-evolution.md).\n\n## Idempotency & concurrency\n\n- **Make POST/PATCH retry-safe with an `Idempotency-Key` header.** The client sends a unique key; the server replays the original response on a retry instead of double-creating. This is an IETF httpapi draft (not yet an RFC) but is the proven pattern across Stripe, PayPal, and others — adopt it for any create/charge/payment-like operation where a network retry could duplicate work.\n\n```http\nPOST /payments\nIdempotency-Key: 9b1f7c2e-... \n```\n\n- **Use `ETag` + `If-Match` for optimistic concurrency** on PUT/PATCH. The server returns an `ETag` (a version fingerprint) on read; the client sends it back in `If-Match` on write. If it no longer matches, the server returns **412 Precondition Failed** — no lost update. Use `If-None-Match` for conditional GET caching.\n\n## Anti-patterns\n\n| Anti-pattern | Why it bites | Do instead |\n|---|---|---|\n| Verbs in paths (`/getUsers`, `/createProject`) | duplicates HTTP semantics, breaks caching/tooling | noun + HTTP method |\n| Mixed plural/singular collections | clients can't predict URLs | one plural convention everywhere |\n| 200 on error (REST) | breaks status-code monitoring and client error handling | real 4xx/5xx + RFC 9457 body |\n| Different error shape per endpoint | every client writes per-endpoint parsing | one `application/problem+json` shape |\n| Leaking stack traces / SQL / DB ids in errors | info leak + couples clients to internals | generic `title`, safe `detail`, correlation id |\n| Offset pagination on a hot/large feed | slow at depth; skips/dups rows on insert | cursor/keyset pagination |\n| Unbounded list endpoint (no limit) | one client can pull the whole table | enforce a default + max `limit` |\n| New version for every change | forks clients, multiplies maintenance | additive non-breaking evolution |\n| Breaking a field in place on a live version | silently breaks existing clients | new field/version + deprecation headers |\n| 401 for a permission failure | misleads client into re-authing | 403 when authenticated-but-forbidden |\n| 200 for a created resource | hides the create, no `Location` | 201 + `Location` header |\n| Ignoring GraphQL partial `errors[]` | failures invisible to monitoring | alert on `errors[]`, not just HTTP 5xx |\n\n## Handoff\n\nThe contract is the artifact. Emit it as an **OpenAPI 3.1** document — the checkable deliverable a framework skill generates code from. How to shape it, and what `scripts/verify.sh` checks: [`references/openapi-contract.md`](references/openapi-contract.md).\n\nHand off to the builder:\n- Python/async → [`../fastapi/SKILL.md`](../fastapi/SKILL.md)\n- NestJS / Node DI → [`../nestjs/SKILL.md`](../nestjs/SKILL.md)\n- Go `net/http` → [`../go/SKILL.md`](../go/SKILL.md)\n- Node generally → [`../nodejs/SKILL.md`](../nodejs/SKILL.md)\n\nAdjacent concerns you do **not** own:\n- Auth hardening, OWASP, CORS/CSP threat-modeling → [`../secure-coding/SKILL.md`](../secure-coding/SKILL.md) (you only place 401/403/scope","tagline":"Use when settling the contract of an API you expose, before implementation: resources/URLs, REST vs GraphQL, versioning, one RFC 9457 error envelope, pagination, idempotency — emitted as OpenAPI 3.1. NOT implementing the endpoints (that is `fastapi`/`nestjs`/`go`/`nodejs`), NOT a","category":"research","tags":["api-design","rest","graphql","openapi","versioning","pagination","http","rfc9457","contract-design","agent-skill"],"author":"ericrisco","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"recursive skill source sync","sourceDetail":"ericrisco/rsc-harness","creatorName":"ericrisco","creatorUrl":"https://github.com/ericrisco","sourceUrl":"https://github.com/ericrisco/rsc-harness/tree/main/skills/api-design","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/ericrisco-api-design#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals."},"stats":{"stars":66,"forks":0,"verified_installs":0,"successful_runs":0,"total_outcomes":0,"rating":0,"review_count":0,"quality_score":40.18},"quality":{"score":69,"tier":"promising","label":"Promising","summary":"Useful candidate, but compare it with alternatives before adopting.","signals":[{"label":"GitHub stars","value":"66","tone":"neutral"},{"label":"Freshness","value":"2d ago","tone":"positive"},{"label":"Install ready","value":"Yes","tone":"positive"},{"label":"License","value":"MIT","tone":"neutral"}],"warnings":["The SKILL.md excerpt is truncated in the review material; the full file should be verified for completeness, but the visible content is well-structured."]},"trust":{"version":"trust-score-v5","score":60,"base_score":68,"outcome_confidence":0,"tier":"review","label":"Sandbox only","summary":"Useful candidate with missing or mixed trust signals. 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