Plugin

Contract Test Validator

API contract testing with Pact, OpenAPI validation, and consumer-driven contract verification

Type: Plugin
Repository: jeremylongshore/tons-of-skills-marketplace
GitHub stars: 2.8k
License: MIT
Repo last updated: Sep 27, 2026
Source file: plugins/testing/contract-test-validator/.claude-plugin/plugin.json
Version: 1.24.0
Author: Claude Code Plugin Hub

What Contract Test Validator is

Contract Test Validator is a plugin published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”

A plugin is a package that bundles skills, slash commands, subagents, hooks, and MCP connectors so they install together. Plugins are plain files with a manifest at .claude-plugin/plugin.json, and they work in both Claude Code and Claude Cowork.

Installing Contract Test Validator adds everything it ships in one step. Connectors inside a plugin still need to be connected separately, and hooks and subagents only run in Cowork and Claude Code, not in regular chat.

How to install Contract Test Validator

Claude Code

Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace
Install the plugin: claude plugin install contract-test-validator@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json.
Restart the session if the new skills or commands don't appear straight away.

Claude Cowork

Open Customize → Plugins and choose Add marketplace.
Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub).
Find Contract Test Validator in the list, click Install, then connect any connectors it needs from its Connectors tab.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/testing/contract-test-validator/.claude-plugin/plugin.json, shared under the repository's MIT license. Read the full file on GitHub.

API contract testing with Pact, OpenAPI validation, and consumer-driven contract verification.

Installation

/plugin install contract-test-validator@claude-code-plugins-plus

Usage

/contract-test
# or shortcut
/ct

Features

Consumer-Driven Testing: Generate and verify Pact contracts
OpenAPI Validation: Validate APIs against OpenAPI specs
Breaking Change Detection: Identify incompatible API changes
Multi-Protocol: REST, GraphQL, gRPC support
CI/CD Integration: Automated contract verification
Contract Evolution: Version management and migration strategies

Example Workflow

# Generate contract tests for your API
/contract-test

# Claude analyzes your API and generates:
#  Pact consumer contracts
#  Provider verification tests
#  OpenAPI validation
#  Breaking change detection

Supported Technologies

Pact (Consumer-Driven Contracts)
OpenAPI 3.x
GraphQL schemas
gRPC/Protobuf
JSON Schema
Spring Cloud Contract

Files

commands/contract-test.md - Main contract testing command

License

MIT

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Contract Test Validator?

Contract Test Validator is a plugin for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. API contract testing with Pact, OpenAPI validation, and consumer-driven contract verification

How do I install Contract Test Validator in Claude Code?

Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace Install the plugin: claude plugin install contract-test-validator@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json. Restart the session if the new skills or commands don't appear straight away.

Can I use Contract Test Validator in Claude Cowork?

Open Customize → Plugins and choose Add marketplace. Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub). Find Contract Test Validator in the list, click Install, then connect any connectors it needs from its Connectors tab.

Is Contract Test Validator safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.