Agent skill · Backend & API

api-contract-validator

Validates API contracts for correctness, compatibility, and compliance. Tests REST APIs against OpenAPI/Swagger specifications. Detects breaking changes between versions, validates runtime responses against schemas, and ensures backward compatibility before deployment.

majiayu000github.com/majiayu000GitHub ↗
claude-codecan modify filesMIT
Install
npx skills add majiayu000/claude-skill-registry --skill api-contract-validator-chaserbreitenbach-claude-skills-and-ag --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

Facts
Files in the skill folder: 2
SKILL.md size: 5 KB
Bundled scripts: none
Version: 1.0.0
Declared author: QuantQuiver AI R&D
Allowed tools: -Bash-Read-Write-Edit-Glob-Grep
Path: skills/api/api-contract-validator-chaserbreitenbach-claude-skills-and-ag/SKILL.md
Open the folder on GitHub →
Where it comes from
Stars: 534
Language: HTML

Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.

From the SKILL.md

# API Contract Validator ## Purpose Validates API contracts for correctness, compatibility, and compliance. Tests REST APIs against OpenAPI/Swagger specifications. Detects breaking changes between versions and validates runtime responses against schemas. ## Triggers Use this skill when: - "validate API contract" - "test API endpoints" - "check for breaking changes" - "API compatibility test" - "contract testing" - "verify OpenAPI spec" ## When to Use - New API version deployment - Consumer complaints about changes - Pre-release validation - Multi-service integration testing - Third-party API consumption validation ## When NOT to Use - Unit testing internal functions (use unit-test-generator) - Load testing (use performance-benchmark) - Security testing (use security-test-suite) - Data quality validation (use data-validation) --- ## Core Instructions ### Validation Categories | Category | Description | Severity | | -------- | ----------- | -------- | | **Schema Compliance** | Response matches OpenAPI schema | Critical | | **Status Codes** | Correct codes for scenarios | Critical | | **Breaking Changes** | Backward incompatible changes | Critical | | **Deprecations** | Deprecated fie

What's inside
Steps it walks through
  1. Purpose
  2. Triggers
  3. When to Use
  4. When NOT to Use
  5. Core Instructions
  6. Validation Categories
  7. Breaking Change Detection
  8. Validation Procedure
  9. Templates
  10. Validation Report
  11. Example
  12. Validation Checklist
  13. Related Skills
Ships with 1 file
  • metadata.json
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About this skill
What does the api-contract-validator skill do?

Validates API contracts for correctness, compatibility, and compliance. Tests REST APIs against OpenAPI/Swagger specifications. Detects breaking changes between versions, validates runtime responses against schemas, and ensures backward compatibility before deployment.

How do I install it?

Run `npx skills add majiayu000/claude-skill-registry --skill api-contract-validator-chaserbreitenbach-claude-skills-and-ag --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.

Where does this skill come from?

From majiayu000/claude-skill-registry, a repository with 534 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.

Is a popular skill a good skill?

Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.

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