API Contract Regression Guard

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Detects and prevents breaking changes in REST, GraphQL, and gRPC API contracts while ensuring semantic versioning compliance.

API Contract Regression Guard is a specialized capability for Claude Code that automates the detection of breaking changes across diverse API protocols by comparing current schema definitions against established baselines. It streamlines the software development lifecycle (SDLC) by identifying removed endpoints, field type mismatches, and schema violations early, while integrating directly with consumer contract testing frameworks like Pact and Spring Cloud Contract. This skill provides engineering teams with detailed compatibility reports, impact analysis for specific consumers, and enforced semantic versioning logic to maintain stable integrations for downstream users.

Key Features

01Multi-protocol support for REST (OpenAPI), GraphQL, and gRPC (Protobuf)
02Automated breaking change classification (Breaking, Non-Breaking, Deprecated)
03Consumer contract testing integration with Pact and Spring Cloud Contract
04Semantic versioning (SemVer) validation and enforcement rules
05Comprehensive compatibility reporting with migration path recommendations
06103 GitHub stars

Use Cases

01Generating detailed API migration reports for external developers and partners
02Automated CI/CD pipeline checks to prevent accidental breaking changes in production
03Validating backend schema updates against frontend consumer expectations