cc-skill-backend-patterns

Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.

Install with Tessl CLI

npx tessl i github:sickn33/antigravity-awesome-skills --skill cc-skill-backend-patterns

What are skills?

1.42x

Review — 45%

Does it follow best practices?

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Evaluation — 100%

↑ 1.42x

Agent success when using this skill

Validation — 9 / 11 Passed

Validation for skill structure

SKILL.md

Review

Evals

Evaluation results

100%

36%

Product Catalog API

Repository pattern and N+1 prevention

Criteria

Without context

With context

Repository interface

100%

Repository implementation

100%

Service layer class

100%

N+1: batch ID collection

100%

N+1: Map-based association

100%

Specific column selection

100%

RESTful URL structure

100%

Query parameter support

100%

Without context: $0.3345 · 1m 28s · 12 turns · 12 in / 5,914 out tokens

With context: $0.4732 · 1m 49s · 17 turns · 99 in / 6,721 out tokens

100%

30%

CMS Security Layer

Auth middleware, error handling, and rate limiting

Criteria

Without context

With context

ApiError class

100%

Centralized error handler: ApiError branch

100%

Centralized error handler: ZodError branch

30%

100%

Bearer token extraction

100%

Missing token error

100%

JWT verification library

100%

rolePermissions map

100%

hasPermission function

100%

requirePermission HOF

62%

100%

RateLimiter Map storage

37%

100%

Sliding window filter

100%

429 with x-forwarded-for

100%

Without context: $0.6993 · 3m 7s · 22 turns · 71 in / 12,847 out tokens

With context: $0.5167 · 1m 32s · 22 turns · 71 in / 5,659 out tokens

100%

23%

Price Lookup Service

Caching, structured logging, retry, and background jobs

Criteria

Without context

With context

Cache-aside: check before fetch

100%

Cache TTL 300 seconds

100%

Cache key format

100%

Logger class methods

100%

Structured JSON log entries

70%

100%

requestId per request

100%

method and path in log context

100%

Exponential backoff formula

16%

100%

Default maxRetries = 3

75%

100%

Non-blocking job queue

100%

Immediate queued response

100%

Without context: $0.4131 · 2m · 14 turns · 13 in / 8,069 out tokens

With context: $0.4216 · 1m 31s · 15 turns · 304 in / 6,157 out tokens

Evaluated: 6 days ago
Agent: Claude Code
Model: Unknown

Table of Contents

Product Catalog API CMS Security Layer Price Lookup Service

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