Agent skill

API Design Principles

REST 및 GraphQL API 설계 원칙 가이드. An agent skill from jh941213/my-cc-harness.

No licenceAuto-check passedBackend & APIs

Install API Design Principles

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/api-design-principles .claude/skills/api-design-principles && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .claude/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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

$skill-installer install https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles

Type 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.

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/api-design-principles .agents/skills/api-design-principles && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .agents/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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.

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/api-design-principles .cursor/skills/api-design-principles && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .cursor/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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

$ gemini skills install https://github.com/jh941213/my-cc-harness.git --path skills/api-design-principles

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/api-design-principles .gemini/skills/api-design-principles && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .gemini/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles

Installs 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).

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/api-design-principles .github/skills/api-design-principles && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .github/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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.

skills CLI

$ npx skills add jh941213/my-cc-harness --skill api-design-principles -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install jh941213/my-cc-harness api-design-principles --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/jh941213/my-cc-harness.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/api-design-principles .opencode/skills/api-design-principles && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "api-design-principles" agent skill from https://github.com/jh941213/my-cc-harness/tree/main/skills/api-design-principles into .opencode/skills/api-design-principles/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-design-principles", 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-principles
GitHub stars: 126
Used in: 19 other repos
Token cost: ~3.4k tokens
SKILL.md length: 459 words
Files: 5 (incl. references, assets)
Skills in repo: 66
Repo updated: Aug 3, 2026
First seen: Oct 7, 2026
Licence: None found

At a glance

REST 및 GraphQL API 설계 원칙 가이드. An agent skill from jh941213/my-cc-harness.

Works in 3 steps: RESTful Design Principles → GraphQL Design Principles → API Versioning Strategies
Tasks that involve GraphQL
SKILL.md covers When to Use This Skill, Core Concepts, REST API Design Patterns and GraphQL Design Patterns, plus 3 more sections
Runs Python scripts from its folder

What it does

API Design Principles is an agent skill from jh941213/my-cc-harness. REST 및 GraphQL API 설계 원칙 가이드. 새로운 API 설계, API 스펙 리뷰, API 설계 표준 수립 시 활용. 트리거: "API 설계", "REST", "GraphQL", "엔드포인트 설계", "API versioning", "API 패턴" 안티-트리거: "프론트엔드 UI", "데이터베이스 스키마만", "CSS/스타일링", "배포/인프라"

Its SKILL.md is about 3.4k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files and assets (for example `assets/api-design-checklist.md`, `assets/rest-api-template.py` and `references/graphql-schema-design.md`).

It sits in Backend & APIs, covering GraphQL, API design and Design patterns. It works with GraphQL.

When your agent uses it

Tasks that involve GraphQL
Tasks that involve API design
Tasks that involve Design patterns

Example prompts

“API 설계”
“GraphQL”
“API versioning”
“/api-design-principles”

Requirements

Python 3

Workflow steps

3 steps, taken from the step headings in SKILL.md.

RESTful Design Principles
GraphQL Design Principles
API Versioning Strategies

What it can do on your machine

Read from SKILL.md and the folder at commit e9210e2. 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
Ships script files (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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 Principles loads about 3.4k tokens when it runs, and up to ~7.6k if it reads all its reference files. Until then it costs about 56 tokens; SKILL.md has 459 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~56
When it runs · the whole SKILL.md, loaded when a task matches: ~3.4k
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~7.6k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 459 words (~3,434 tokens).

“Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.”

— opening of SKILL.md by jh941213

name: api-design-principles
user-invocable: false

Outline of SKILL.md

API Design Principles
When to Use This Skill
Core Concepts
1. RESTful Design Principles
2. GraphQL Design Principles
3. API Versioning Strategies
REST API Design Patterns
Pattern 1: Resource Collection Design
Pattern 2: Pagination and Filtering
Pattern 3: Error Handling and Status Codes
Pattern 4: HATEOAS (Hypermedia as the Engine of Application State)
GraphQL Design Patterns
Pattern 1: Schema Design
Pattern 2: Resolver Design
Pattern 3: DataLoader (N+1 Problem Prevention)
Best Practices
REST APIs
GraphQL APIs
Common Pitfalls
Resources

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files (references, assets) in skills/api-design-principles of jh941213/my-cc-harness.

SKILL.md
assets/api-design-checklist.md
assets/rest-api-template.py
references/graphql-schema-design.md
references/rest-best-practices.md

Open the folder on GitHubat commit e9210e2

Used in at least 9 other repositories

We found 74 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 19 other GitHub owners. This page covers the copy in jh941213/my-cc-harness, which our catalogue first saw on October 7, 2026.

…and 24 more copies not listed here.

Compare with similar skills

API Design Principles 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.

API Design Principles compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
API Design Principles this skilljh941213/my-cc-harness	126	19 repos	~3.4k	Automated safety check: Pass	None	2 mo ago
API Contract Designrsmdt/the-startup	536	—	~1.1k	Automated safety check: Pass	MIT	2 mo ago
API DesignerJeffallan/claude-skills	12k	2 repos	~2k	Automated safety check: Pass	MIT	3 days ago
Nodejs Backend Patternsever-works/ever-works	158	17 repos	~4k	Automated safety check: Pass	AGPL-3.0	yesterday
API And Interface Designdzhalaevd/Donatello	135	9 repos	~2.6k	Automated safety check: Pass	Apache-2.0	3 days ago
Designing APIsCloudAI-X/claude-workflow-v2	1.4k	2 repos	~1.2k	Automated safety check: Pass	MIT	yesterday

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API Contract Design
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536 GitHub stars~1.1k tokensUpdated 2 mo ago
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Build production-ready Node.js backend services with Express/Fastify, implementing middleware patterns, error handling, authentication, database integration, and API design best practices.
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API And Interface Design
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Designs REST and GraphQL APIs including endpoints, error handling, versioning, and documentation.
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Questions about API Design Principles

What does API Design Principles do?

REST 및 GraphQL API 설계 원칙 가이드. An agent skill from jh941213/my-cc-harness. API Design Principles is an agent skill from jh941213/my-cc-harness. REST 및 GraphQL API 설계 원칙 가이드.

When should I use API Design Principles?

API Design Principles fits situations like: tasks that involve GraphQL; tasks that involve API design; tasks that involve Design patterns.

How do I install API Design Principles in Claude Code?

Run `npx skills add jh941213/my-cc-harness --skill api-design-principles -a claude-code`. Or copy the skill folder (skills/api-design-principles in jh941213/my-cc-harness) into .claude/skills/api-design-principles in your project. Claude Code loads it when a task matches its description.

How do I install API Design Principles in Codex?

Run `npx skills add jh941213/my-cc-harness --skill api-design-principles -a codex`. Or copy the skill folder (skills/api-design-principles in jh941213/my-cc-harness) into .agents/skills/api-design-principles in your project. Codex loads it when a task matches its description.

Can I use API Design Principles 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 jh941213/my-cc-harness --skill api-design-principles -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-principles, .gemini/skills/api-design-principles, .github/skills/api-design-principles and .opencode/skills/api-design-principles in your project.

What does API Design Principles need to run?

Going by SKILL.md and its folder, API Design Principles needs Python for the scripts in its folder. Our summary lists: Python 3.

Does API Design Principles access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is API Design Principles 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 Principles use?

No licence was found for API Design Principles or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does API Design Principles use?

About 3.4k tokens (SKILL.md is roughly 14k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.1k tokens, read only when the agent opens those files.

What are the alternatives to API Design Principles?

Skills that share tags, products or a category with API Design Principles: API Contract Design (rsmdt/the-startup, 536 stars), API Designer (Jeffallan/claude-skills, 12k stars), Nodejs Backend Patterns (ever-works/ever-works, 158 stars) and API And Interface Design (dzhalaevd/Donatello, 135 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains API Design Principles?

jh941213 (a GitHub user) maintains it in jh941213/my-cc-harness, which has 126 GitHub stars. The repository holds 66 skills in this directory. The repository was last updated on August 3, 2026.

Source: jh941213/my-cc-harness on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

API Design Principles

Install API Design Principles

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in at least 9 other repositories

Compare with similar skills

Similar skills

API Contract Design

API Designer

Nodejs Backend Patterns

API And Interface Design

Designing APIs

GraphQL Architect

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Questions about API Design Principles

Install API Design Principles

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Used in at least 9 other repositories

Compare with similar skills

Similar skills

More from jh941213/my-cc-harness

Related

Questions about API Design Principles