API Design Pack
Multi-protocol API auditor for REST, GraphQL, tRPC, and OpenAPI design patterns.
$5
Works with the AI tools you already use
Claude Code
Cursor
Codex CLI
GitHub Copilot
Gemini CLI+20 moreClaude CodeCursorCodex CLIGitHub CopilotGemini CLI
OpenClaw
Manus
Grok+17 agentsAPI Design Pack
Example session with this skill installed
Review this Express route
app.post('/item', (req, res) => {
const item = db.items.create(req.body);
res.status(200).send(item);
});
- Read your context and instructions
- Compiled the api design
Stack
Express.js, JavaScript
Audit
- REST: Wrong status code. POST /item returns 200, but should be 201 Created.
- REST: Resource naming. Route is singular '/item', should be plural '/items'.
- Rate Limiting: No middleware detected for this write operation.
Fixes
res.status(201).send(item);
Connects securely to your tools. The creator never sees your data.
What you get
About this skill
The problem
API inconsistencies and anti-patterns often go unnoticed until production, leading to brittle integrations, N+1 performance bottlenecks, and poor developer experiences. Manually checking every route for proper status codes, pagination, and rate limiting is tedious and error-prone.
What it does
- Audits REST, GraphQL, and tRPC code for architectural anti-patterns using a multi-skill detection engine.
- Identifies specific violations like missing pagination, incorrect HTTP status codes, and N+1 resolver loops with line-level citations.
- Generates concrete code fixes using detected frameworks like FastAPI, Express, or Apollo.
- Validates OpenAPI/Swagger schemas for completeness, documentation quality, and security definitions.
- Analyzes rate limiting strategies, suggesting token bucket or sliding window implementations based on your stack.
Frameworks & tools
REST (Express, FastAPI), GraphQL (Apollo, DataLoader), tRPC, OpenAPI 3.0/3.1, Swagger, Zod, and Pydantic.
Why this beats prompting it yourself
Generic prompts often miss the nuances of specific protocols, such as RFC 7807 error formats or GraphQL forward compatibility rules. This skill uses a structured matrix to apply deep domain rules specific to your detected stack, ensuring you don't just get "cleaner code" but technically compliant API design.
Use cases
- Reviewing legacy REST controllers for missing idempotency and pagination.
- Fixing N+1 query issues in complex GraphQL resolver chains.
- Converting flat tRPC routers into scalable sub-router architectures.
- Hardening endpoints with RFC-compliant rate limit headers and 429 error handling.
Known limitations
Operates only on provided code and schemas. Does not execute, test, or deploy APIs.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
Skills folder by agent
Click the path to copy it. Create the folder if it does not exist yet.
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Security scanned
Verified clean 1 month ago
- Passed all security checks, Safe to install