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api-contract-validator

Validate API contracts against OpenAPI specifications for schema compliance and breaking changes.

Updated Aug 23, 2026
Search Tags:#testing#api#openapi#validation#breaking-changes#contract
One-click install
npx skills add https://github.com/chaserbreitenbach/claude-skills-and-agents --skill api-contract-validator-chaserbreitenbach
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: api-contract-validator
Source: https://github.com/chaserbreitenbach/claude-skills-and-agents/tree/main/skills/testing/api-contract-validator
Command: npx skills add https://github.com/chaserbreitenbach/claude-skills-and-agents --skill api-contract-validator-chaserbreitenbach

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Validates API contracts for correctness, ensures compatibility across versions, and enforces conformance to OpenAPI specifications, reducing integration risk and deployment issues.

Core Features & Use Cases

  • Schema Compliance: Validates response payloads against the OpenAPI schemas to catch mismatches early.
  • Breaking Change Detection: Compares current and previous specs to surface removals, type changes, or added required fields.
  • Runtime Validation (Optional): Validates runtime responses against schemas during pre-production testing or staging.

Quick Start

Validate your first OpenAPI spec against the production contract to ensure alignment.

Frequently Asked Questions about api-contract-validator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect breaking changes in an OpenAPI specification?▼

Breaking change detection compares current and previous OpenAPI specs to surface removals, type changes, or added required fields. This validation prevents versioned APIs from introducing incompatible modifications during pre-release.

What is API contract validation for multi-service integrations?▼

API contract validation checks correctness and compatibility across multi-service integrations. It enforces conformance to OpenAPI specifications, verifying schema compliance to reduce integration risk and deployment issues.

Can I validate runtime API responses against OpenAPI schemas?▼

Runtime validation checks live API responses against OpenAPI schemas. This optional feature executes during pre-production testing or staging to catch payload mismatches early before deployment.

How do I ensure schema compliance for API response payloads?▼

Schema compliance validates API response payloads against OpenAPI schemas. This process catches data mismatches early, ensuring third-party API consumption and multi-service integrations conform to standardized formats.

Does API contract validation handle deprecation and standardized error formats?▼

API contract validation satisfies requirements for deprecation handling and standardized error formats. It ensures versioned APIs maintain compatibility and conformance during pre-release validation.

When do I need to validate an API contract for third-party consumption?▼

Validate API contracts for third-party consumption during pre-release and integration phases. This checks correctness, compatibility, and OpenAPI conformance to reduce deployment issues caused by schema mismatches.

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