Agent skill

api-contract-checker

Validate API changes against an expected contract. Use when a mid-level developer needs to detect breaking changes.

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/api-contract-checker

SKILL.md

API Contract Checker

Purpose

Validate API changes against an expected contract.

Inputs to request

  • Old and new API specs or examples.
  • Versioning policy and client expectations.
  • Known consumers and usage patterns.

Workflow

  1. Compare endpoints, request/response fields, and status codes.
  2. Identify breaking changes and backward-compatible adjustments.
  3. Suggest versioning or migration notes.

Output

  • Breaking change report with mitigation steps.

Quality bar

  • Flag any removal or behavior change clearly.
  • Recommend safe rollouts for clients.

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