Nodejs Backend Patterns
ever-works/ever-works
Build production-ready Node.js backend services with Express/Fastify, implementing middleware patterns, error handling, authentication, database integration, and API design best practices.
Backend API design specialist. An agent skill from selmakcby/claude-agents-skills.
Install API Design
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install selmakcby/claude-agents-skills api-design --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .claude/skills/api-design && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .claude/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-designType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install selmakcby/claude-agents-skills api-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .agents/skills/api-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .agents/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install selmakcby/claude-agents-skills api-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .cursor/skills/api-design && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .cursor/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/selmakcby/claude-agents-skills.git --path my-project-demo/.claude/skills/api-design--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install selmakcby/claude-agents-skills api-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .gemini/skills/api-design && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .gemini/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install selmakcby/claude-agents-skills api-designInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .github/skills/api-design && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .github/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add selmakcby/claude-agents-skills --skill api-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install selmakcby/claude-agents-skills api-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/selmakcby/claude-agents-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/my-project-demo/.claude/skills/api-design .opencode/skills/api-design && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "api-design" agent skill from https://github.com/selmakcby/claude-agents-skills/tree/main/my-project-demo/.claude/skills/api-design into .opencode/skills/api-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
api-design- GitHub stars
- 136
- Token cost
- ~1.1k tokens
- SKILL.md length
- 369 words
- Files
- 1
- Skills in repo
- 8
- Repo updated
- First seen
- Licence
- MIT
At a glance
Backend API design specialist. An agent skill from selmakcby/claude-agents-skills.
- Building REST/GraphQL APIs
- SKILL.md covers When to trigger, Core RESTful principles, Endpoint design patterns and Security (mandatory), plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Designing endpoints
What it does
API Design is an agent skill from selmakcby/claude-agents-skills. Backend API design specialist. Use when building REST/GraphQL APIs, designing endpoints, data models, or backend architecture. Covers RESTful principles, HTTP semantics, error handling, versioning, and OWASP-aligned security.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering API design, REST APIs and GraphQL. The repository describes itself as: Multi-Agent Claude Code setup — 4 uzman ajan (planner · ui-agent · builder · reviewer) + skills + Next.js demo projesi. YouTube Bölüm 1 video materyalleri. The licence is MIT.
When your agent uses it
- Building REST/GraphQL APIs
- Designing endpoints
- Backend architecture
Example prompts
- “/api-design”
What it can do on your machine
Read from SKILL.md and the folder at commit ddcfb0c. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript and markdown).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
API Design loads about 1.1k tokens when it runs. Until then it costs about 59 tokens; SKILL.md has 369 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from selmakcby/claude-agents-skills at commit ddcfb0c, republished under its MIT licence (© selmakcby). 369 words, ~1,072 tokens.
Download SKILL.mdSave it as
.claude/skills/api-design/SKILL.md (or your agent's skills folder).- name
- api-design
- description
- Backend API design specialist. Use when building REST/GraphQL APIs, designing endpoints, data models, or backend architecture. Covers RESTful principles, HTTP semantics, error handling, versioning, and OWASP-aligned security.
<!--
Source: wshobson/agents (backend-development plugin)
File: https://github.com/wshobson/agents/tree/main/plugins/backend-development/skills/api-design-principles
Used by: builder agent (backend)
-->API Design Principles
When to trigger
- Designing a new API endpoint
- Adding routes to existing API
- Database schema work that affects API contract
- Keywords: "endpoint", "API", "route", "backend", "server", "REST", "GraphQL"
Core RESTful principles
Resource-oriented URLs
- Nouns, not verbs:
/users/123, not/getUser?id=123 - Pluralize resources:
/orders, not/order - Nest only when expressing parent/child:
/users/:id/orders - Max 2 levels deep — beyond that, use query params
HTTP methods (correct semantics)
| Method | Use for | Idempotent | Safe |
|---|---|---|---|
| GET | Read | Yes | Yes |
| POST | Create | No | No |
| PUT | Replace (full update) | Yes | No |
| PATCH | Partial update | No* | No |
| DELETE | Remove | Yes | No |
* PATCH can be idempotent depending on semantics.
Status codes (correct use)
- 200 OK — successful GET/PUT/PATCH with body
- 201 Created — successful POST creating resource
- 204 No Content — successful DELETE or action with no body
- 400 Bad Request — validation failure
- 401 Unauthorized — missing/invalid auth
- 403 Forbidden — authenticated but not authorized
- 404 Not Found — resource doesn't exist
- 409 Conflict — version mismatch, duplicate resource
- 422 Unprocessable Entity — semantic validation failure
- 429 Too Many Requests — rate limited
- 500 Internal Server Error — unhandled server fault
Response envelope
Consistent shape for all responses:
{
success: boolean
data: T | null
error: string | null
metadata?: { total, page, limit }
}Endpoint design patterns
Pagination
- Cursor-based for large/changing sets:
?cursor=abc&limit=20 - Offset-based for small stable sets:
?page=1&limit=20 - Always cap
limitserver-side (max 100)
Filtering
- Query params:
?status=active&created_after=2024-01-01 - Sort:
?sort=-created_at(minus prefix = descending)
Show full SKILL.md (159 more words)Show less
Versioning
- URL path:
/v1/users,/v2/users(easiest to deprecate) - Never introduce breaking changes to existing version
Security (mandatory)
- Authentication — every non-public endpoint checks auth first
- Authorization — row-level checks, not just auth-exists
- Input validation — Zod schema on every request body + query
- Rate limiting — public routes + AI/LLM routes especially
- CORS — whitelist, not
* - Output filtering — never leak internal IDs or PII in error messages
- Webhook signatures — verify signature before trusting payload
Error handling
- Never expose stack traces to the client
- Log server-side with request ID
- Return structured error:
{ code: "INVALID_INPUT", message: "...", field: "email" } - HTTP status code must match error type
Output format
## API Design Summary
### Endpoint
`<METHOD> /path/to/resource`
### Purpose
<what it does, who uses it>
### Request
- **Auth:** <required | optional>
- **Body schema:** Zod
- **Query params:** ...
### Response
- **200:** <shape>
- **Error cases:** 400, 401, 403, 404, 422, 429, 500
### Security checks
- [ ] Auth verified
- [ ] Authorization verified (row-level)
- [ ] Input validated (Zod)
- [ ] Rate limit applied
- [ ] PII not leaked in errors
### Dependencies
- Database tables: <list>
- External services: <list>Rules
- RESTful first. Only use GraphQL / RPC if there's a concrete reason.
- No breaking changes to existing API versions. Ever.
- Every endpoint validates input — no "we'll add validation later".
- Every endpoint has a test (unit for business logic, integration for HTTP layer).
- Document before coding. OpenAPI spec or at least a Markdown contract.
- Rate limit on day 1 — retrofitting is painful.
© selmakcby, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in my-project-demo/.claude/skills/api-design of selmakcby/claude-agents-skills.
Open the folder on GitHubat commit ddcfb0c
Compare with similar skills
API Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| API Design this skillselmakcby/claude-agents-skills | 136 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Nodejs Backend Patternsever-works/ever-works | 158 | 18 repos | ~4k | Automated safety check: Pass | AGPL-3.0 | |
| API DesignerJeffallan/claude-skills | 12k | 2 repos | ~2k | Automated safety check: Pass | MIT | |
| Pangolin CRUD Endpointsfosrl/pangolin | 23k | — | ~461 | Automated safety check: Pass | Custom licence | |
| Backend FundamentalsDanielPodolsky/ownyourcode | 290 | 1 repos | ~1.1k | Automated safety check: Pass | MIT | |
| API Auditbriiirussell/cybersecurity-skills | 413 | — | ~2.8k | Automated safety check: Notes | MIT |
Similar skills
API Designer
Jeffallan/claude-skills
Designs REST and GraphQL APIs from resource modeling to an OpenAPI 3.1 contract, with versioning, pagination and RFC 7807 error handling.
Pangolin CRUD Endpoints
fosrl/pangolin
Use whenever asked to add, create, or scaffold a CRUD endpoint, router, or entity in this repo's server (create/list/get/update/delete handlers, new…
Backend Fundamentals
DanielPodolsky/ownyourcode
Reviews API design, REST conventions, and backend architecture.
API Audit
briiirussell/cybersecurity-skills
Audit REST, GraphQL, and RPC APIs against the OWASP API Security Top 10 (2023).
API Design Interviewer
PrepLabsAI/InterviewMentor
A Staff Engineer interviewer specializing in API architecture and developer experience.
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Categories
Questions about API Design
What does API Design do?
Backend API design specialist. An agent skill from selmakcby/claude-agents-skills. API Design is an agent skill from selmakcby/claude-agents-skills. Backend API design specialist.
When should I use API Design?
API Design fits situations like: building REST/GraphQL APIs; designing endpoints; backend architecture.
How do I install API Design in Claude Code?
Run `npx skills add selmakcby/claude-agents-skills --skill api-design -a claude-code`. Or copy the skill folder (my-project-demo/.claude/skills/api-design in selmakcby/claude-agents-skills) into .claude/skills/api-design in your project. Claude Code loads it when a task matches its description.
How do I install API Design in Codex?
Run `npx skills add selmakcby/claude-agents-skills --skill api-design -a codex`. Or copy the skill folder (my-project-demo/.claude/skills/api-design in selmakcby/claude-agents-skills) into .agents/skills/api-design in your project. Codex loads it when a task matches its description.
Can I use API Design in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add selmakcby/claude-agents-skills --skill api-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/api-design, .gemini/skills/api-design, .github/skills/api-design and .opencode/skills/api-design in your project.
What does API Design need to run?
SKILL.md names no scripts, command-line tools or credentials: API Design is instructions for the agent only.
Does API Design access the network?
SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.
Is API Design safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does API Design use?
API Design is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does API Design use?
About 1.1k tokens (SKILL.md is roughly 4.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to API Design?
Skills that share tags, products or a category with API Design: Nodejs Backend Patterns (ever-works/ever-works, 158 stars), API Designer (Jeffallan/claude-skills, 12k stars), Pangolin CRUD Endpoints (fosrl/pangolin, 23k stars) and Backend Fundamentals (DanielPodolsky/ownyourcode, 290 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains API Design?
selmakcby (a GitHub user) maintains it in selmakcby/claude-agents-skills, which has 136 GitHub stars. The repository holds 8 skills in this directory. The repository was last updated on April 21, 2026.
Source: selmakcby/claude-agents-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.