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🛡️OpenAPI Contract Guard
OpenAPI Contract Guard is a specialized developer tool designed to catch breaking changes and linting violations in your API specifications before they reach production.
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See it in action
You say
Check schema/v1.json and schema/v2.json for breaking changes and lint errors.
Your agent does
API Contract Audit
[BREAKING] OAS-DIFF-001: Removed property user_id from User schema.
[WARNING] OAS-LINT-024: Missing description for GET /orders.
Remediation: Restore user_id or mark as deprecated if transitioning to uuid.
What you get
About this skill
What it does
OpenAPI Contract Guard is a specialized developer tool designed to catch breaking changes and linting violations in your API specifications before they reach production. It analyzes OpenAPI and Swagger files to identify risks that could impact downstream consumers, such as removed endpoints, modified property types, or missing documentation.
Why use this skill
Manual API reviews are error-prone and time-consuming. This skill automates the detection of "silent breakages" that simple linters often miss. It provides a structured heuristic analysis of the differences between two versions of a spec, ensuring your team maintains strict backward compatibility. By integrating this into your workflow, you prevent broken client integrations and reduce the overhead of manual contract testing.
- Automated Breaking Change Detection: Instantly identifies removals or modifications of existing endpoints and fields.
- Comprehensive Linting: Surfaces style and structural issues following best practices.
- Remediation Guidance: Every finding includes technical evidence and specific steps to fix the issue.
- Format Agnostic: While the core scanner processes JSON, the skill handles YAML-to-JSON conversion seamlessly.
Supported tools
Supports OpenAPI 3.x and Swagger 2.0 specifications in both JSON and YAML formats. It uses a custom Python-based heuristic engine for deep diff analysis.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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