API Contract Test

Derive contract tests from an API description, not from the implementation.

Single skill Verified 12 Nov codingapitesting

Use it for

APIs with an OpenAPI document and clients that depend on the shape

Skip it if

Internal endpoints with no contract — test behaviour instead

What it is

Reads an OpenAPI document and produces contract tests: required fields, status codes, error shapes, and the examples in the spec. The rule is that tests come from the contract rather than the code, so a breaking change fails the test instead of being captured as the new expected behaviour.

Install

Clone the repository, then copy the skill folder into your agent's skills directory — ~/.claude/skills/ for Claude Code. Skills are plain files: no build step, no daemon.

Terminal

npx skills add api-contract-test

How to judge it

Read the SKILL.md before you install. A good skill states when it applies, what it must not do, and how to verify the result. A skill that only lists adjectives will change the agent's tone without improving its output — skip those.

Other Coding & Dev skills

Error Budget Review — Turn an incident list into a decision about what to fix next.
Codebase Onboarding — Explain a repository to a new contributor in the order they need it.
Web Artifacts Builder — Official skill for building a self-contained web app as a single artifact.

Tools it pairs with

All tools

Qodo

Test generation and code review wired into the pull request.

Coding & DevFree tier

Verified 12 NovFree

#coding#testing#review

Claude Code

Anthropic

Anthropic's terminal agent: reads the repo, edits files, runs the tests it just broke.

Coding & DevPaid

Verified 9 NovPaid

#agent#cli#coding

Sourcegraph Cody

Sourcegraph

Code assistant that answers with repository context across many repos.

Coding & DevFree tier

Verified 12 NovFree

#coding#context#enterprise

Servers it runs on

All servers

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