API Design Interviewer
PrepLabsAI/InterviewMentor
A Staff Engineer interviewer specializing in API architecture and developer experience.
API design principles and decision-making. An agent skill from xenitV1/Antigravity-Workflows.
Install API Patterns
$ npx skills add xenitV1/Antigravity-Workflows --skill api-patterns -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install xenitV1/Antigravity-Workflows api-patterns --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/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/api-patterns .claude/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .claude/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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/xenitV1/Antigravity-Workflows/tree/main/skills/api-patternsType 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 xenitV1/Antigravity-Workflows --skill api-patterns -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install xenitV1/Antigravity-Workflows api-patterns --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/api-patterns .agents/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .agents/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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 xenitV1/Antigravity-Workflows --skill api-patterns -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install xenitV1/Antigravity-Workflows api-patterns --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/api-patterns .cursor/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .cursor/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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/xenitV1/Antigravity-Workflows.git --path skills/api-patterns--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 xenitV1/Antigravity-Workflows --skill api-patterns -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install xenitV1/Antigravity-Workflows api-patterns --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/api-patterns .gemini/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .gemini/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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 xenitV1/Antigravity-Workflows api-patternsInstalls 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 xenitV1/Antigravity-Workflows --skill api-patterns -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/api-patterns .github/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .github/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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 xenitV1/Antigravity-Workflows --skill api-patterns -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install xenitV1/Antigravity-Workflows api-patterns --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/xenitV1/Antigravity-Workflows.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/api-patterns .opencode/skills/api-patterns && 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-patterns" agent skill from https://github.com/xenitV1/Antigravity-Workflows/tree/main/skills/api-patterns into .opencode/skills/api-patterns/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "api-patterns", 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-patterns- GitHub stars
- 130
- Used in
- 8 other repos
- Token cost
- ~607 tokens
- SKILL.md length
- 223 words
- Files
- 12 (incl. scripts)
- Skills in repo
- 42
- Repo updated
- First seen
- Licence
- MIT
At a glance
API design principles and decision-making. An agent skill from xenitV1/Antigravity-Workflows.
- Tasks that involve GraphQL
- SKILL.md covers 🎯 Selective Reading Rule, 📑 Content Map, 🔗 Related Skills and ✅ Decision Checklist, plus 2 more sections
- Runs Python scripts from its folder; calls python
- Tasks that involve gRPC and Protobuf
What it does
API Patterns is an agent skill from xenitV1/Antigravity-Workflows. API design principles and decision-making. REST vs GraphQL vs tRPC selection, response formats, versioning, pagination.
Its SKILL.md is about 610 tokens, which your agent loads only when the skill is triggered. The skill folder holds 12 other files, including scripts (for example `api-style.md`, `auth.md` and `documentation.md`).
It sits in Backend & APIs, covering GraphQL, gRPC and Protobuf and Structured output and tool calling. It works with GraphQL and tRPC. The licence is MIT.
When your agent uses it
- Tasks that involve GraphQL
- Tasks that involve gRPC and Protobuf
- Tasks that involve Structured output and tool calling
Example prompts
- “/api-patterns”
Requirements
- Python 3
- Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep
What it can do on your machine
Read from SKILL.md and the folder at commit f0a1fa7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteEditGlobGrep
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python
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 Patterns loads about 607 tokens when it runs. Until then it costs about 33 tokens; SKILL.md has 223 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); the scripts in this folder are not scanned.
SKILL.md
The full file from xenitV1/Antigravity-Workflows at commit f0a1fa7, republished under its MIT licence (© xenitV1). 223 words, ~607 tokens.
Download SKILL.mdSave it as
.claude/skills/api-patterns/SKILL.md (or your agent's skills folder). This skill also uses 11 other files; get the full folder from GitHub.- name
- api-patterns
- description
- API design principles and decision-making. REST vs GraphQL vs tRPC selection, response formats, versioning, pagination.
- allowed-tools
- Read, Write, Edit, Glob, Grep
API Patterns
API design principles and decision-making for 2025. Learn to THINK, not copy fixed patterns.
🎯 Selective Reading Rule
Read ONLY files relevant to the request! Check the content map, find what you need.
📑 Content Map
| File | Description | When to Read |
|---|---|---|
api-style.md | REST vs GraphQL vs tRPC decision tree | Choosing API type |
rest.md | Resource naming, HTTP methods, status codes | Designing REST API |
response.md | Envelope pattern, error format, pagination | Response structure |
graphql.md | Schema design, when to use, security | Considering GraphQL |
trpc.md | TypeScript monorepo, type safety | TS fullstack projects |
versioning.md | URI/Header/Query versioning | API evolution planning |
auth.md | JWT, OAuth, Passkey, API Keys | Auth pattern selection |
rate-limiting.md | Token bucket, sliding window | API protection |
documentation.md | OpenAPI/Swagger best practices | Documentation |
security-testing.md | OWASP API Top 10, auth/authz testing | Security audits |
🔗 Related Skills
| Need | Skill |
|---|---|
| API implementation | @[skills/backend-development] |
| Data structure | @[skills/database-design] |
| Security details | @[skills/security-hardening] |
✅ Decision Checklist
Before designing an API:
- Asked user about API consumers?
- Chosen API style for THIS context? (REST/GraphQL/tRPC)
- Defined consistent response format?
- Planned versioning strategy?
- Considered authentication needs?
- Planned rate limiting?
- Documentation approach defined?
❌ Anti-Patterns
DON'T:
- Default to REST for everything
- Use verbs in REST endpoints (/getUsers)
- Return inconsistent response formats
- Expose internal errors to clients
- Skip rate limiting
DO:
- Choose API style based on context
- Ask about client requirements
- Document thoroughly
- Use appropriate status codes
Script
| Script | Purpose | Command |
|---|---|---|
scripts/api_validator.py | API endpoint validation | python scripts/api_validator.py <project_path> |
© xenitV1, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 11 other files (scripts) in skills/api-patterns of xenitV1/Antigravity-Workflows.
- SKILL.md
- api-style.md
- auth.md
- documentation.md
- graphql.md
- rate-limiting.md
- response.md
- rest.md
- scripts/api_validator.py
- security-testing.md
- trpc.md
- versioning.md
Open the folder on GitHubat commit f0a1fa7
Used in 8 other repositories
We found 42 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 8 other GitHub owners. This page covers the copy in xenitV1/Antigravity-Workflows, which our catalogue first saw on October 7, 2026.
- davila7/claude-code-templatescli-tool/components/skills/development/api-patterns
- aiskillstore/marketplaceskills/sickn33/api-patterns
- majiayu000/claude-skill-registryskills/api/api-patternsskills/api/api-patterns-grupous-gpus+18 more
- sickn33/agentic-awesome-skillsskills/api-patternsplugins/agentic-awesome-skills/skills/api-patterns+3 more
- agent-skills-hub/agent-skills-hubskills/api-patterns
- lingxling/awesome-skills-cnantigravity-awesome-skills/skills/api-patternsantigravity-awesome-skills/plugins/agentic-awesome-skills/skills/api-patterns+3 more
- benjaminasterA/antigravity-awesome-skillsskills/api-patterns
- henryalouf/ruflow.agents/skills/api-patterns.agents/skills/antigravity-awesome-skills/skills/api-patterns+6 more
Compare with similar skills
API Patterns 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 Patterns this skillxenitV1/Antigravity-Workflows | 130 | 8 repos | ~607 | Automated safety check: Pass | MIT | |
| API Design InterviewerPrepLabsAI/InterviewMentor | 112 | — | ~2.6k | Automated safety check: Pass | MIT | |
| API Contract Detectionprime-radiant-inc/greenfield | 292 | — | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Implementing API Patternsancoleman/ai-design-components | 526 | 1 repos | ~3k | Automated safety check: Pass | MIT | |
| API Design Patternsbobmatnyc/claude-mpm | 155 | 2 repos | ~5.6k | Automated safety check: Pass | Apache-2.0 | |
| API Architectcuriositech/some_claude_skills | 243 | 1 repos | ~1.4k | Automated safety check: Pass | MIT |
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prime-radiant-inc/greenfield
Finds OpenAPI, GraphQL, Protobuf and JSON Schema files in a codebase and extracts behavioral claims from them as part of a reverse-engineering workflow.
Implementing API Patterns
ancoleman/ai-design-components
API design and implementation across REST, GraphQL, gRPC, and tRPC patterns.
API Design Patterns
bobmatnyc/claude-mpm
Comprehensive API design patterns covering REST, GraphQL, gRPC, versioning, authentication, and modern API best practices
API Architect
curiositech/some_claude_skills
Expert API designer for REST, GraphQL, gRPC architectures. An agent skill from curiositech/some_claude_skills.
API Design
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Categories
Questions about API Patterns
What does API Patterns do?
API design principles and decision-making. An agent skill from xenitV1/Antigravity-Workflows. API Patterns is an agent skill from xenitV1/Antigravity-Workflows. API design principles and decision-making.
When should I use API Patterns?
API Patterns fits situations like: tasks that involve GraphQL; tasks that involve gRPC and Protobuf; tasks that involve Structured output and tool calling.
How do I install API Patterns in Claude Code?
Run `npx skills add xenitV1/Antigravity-Workflows --skill api-patterns -a claude-code`. Or copy the skill folder (skills/api-patterns in xenitV1/Antigravity-Workflows) into .claude/skills/api-patterns in your project. Claude Code loads it when a task matches its description.
How do I install API Patterns in Codex?
Run `npx skills add xenitV1/Antigravity-Workflows --skill api-patterns -a codex`. Or copy the skill folder (skills/api-patterns in xenitV1/Antigravity-Workflows) into .agents/skills/api-patterns in your project. Codex loads it when a task matches its description.
Can I use API Patterns 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 xenitV1/Antigravity-Workflows --skill api-patterns -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-patterns, .gemini/skills/api-patterns, .github/skills/api-patterns and .opencode/skills/api-patterns in your project.
What does API Patterns need to run?
Going by SKILL.md and its folder, API Patterns needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep.
Does API Patterns 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 Patterns 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does API Patterns use?
API Patterns 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 Patterns use?
About 607 tokens (SKILL.md is roughly 2.4k 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 Patterns?
Skills that share tags, products or a category with API Patterns: API Design Interviewer (PrepLabsAI/InterviewMentor, 112 stars), API Contract Detection (prime-radiant-inc/greenfield, 292 stars), Implementing API Patterns (ancoleman/ai-design-components, 526 stars) and API Design Patterns (bobmatnyc/claude-mpm, 155 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains API Patterns?
xenitV1 (a GitHub user) maintains it in xenitV1/Antigravity-Workflows, which has 130 GitHub stars. The repository holds 42 skills in this directory. The repository was last updated on January 14, 2026.
Source: xenitV1/Antigravity-Workflows on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.