API Contract Diff Checker MCP, Ready to Go
Use the API Contract Diff Checker MCP with Claude or Cursor to audit OpenAPI and GraphQL schemas for breaking changes and SemVer bumps automatically.
No credit card required. Experience the power of this integration risk-free.
Audit OpenAPI and GraphQL schemas for breaking changes before you deploy.
Works with every AI agent you already use
…and any MCP-compatible client
How fast is the API Contract Diff Checker MCP Server?
Average time for the server to become ready for requests over the last 9 days, measured until the initialize / tools/list handshake completes. Metrics are updated daily between 00:00 and 04:00 UTC. Create a free account, use this MCP on Vinkius Cloud, and connect it to your AI agent in seconds.
Waiting for input…
What AI agents can do with API Contract Diff Checker: 3 Tools for API Schema Audits
Use these tools to automatically detect breaking changes in your API contracts, catch removed endpoints, and get clear SemVer recommendations.
Diff graphql
Compares two GraphQL SDL strings to identify breaking and additive changes. It shows you exactly which fields were added or removed in your schema.
Diff openapi
Compares two OpenAPI specs to find structural differences and compatibility issues. It helps you identify if your REST API changes will break existing clients.
Evaluate version bump
Analyzes a collection of identified changes to recommend a Semantic Versioning increment. It tells you if your update qualifies as a MAJOR, MINOR, or PATCH release.
One MCP enables access. Vinkius turns MCPs into production-ready infrastructure.
You're looking at one of 5,800+ managed MCPs. The real value isn't the catalog. It's the control plane that secures, governs, audits, and manages every interaction between your agents and the tools they use.
No Shadow AI
Every agent action is visible, approved, and auditable. Nothing runs outside your governance.
Absolute agent control
Fine-grained permissions for every agent, MCP, and tool. Instantly revoke access and audit every execution.
Cost control per token
Spend broken down to the token, tool, and agent. Budgets and hard limits. No surprise invoices.
Managed & monitored infra
We operate the runtime, authentication, scaling, retries, and monitoring. Your team manages AI, not infrastructure.
Data protection, DLP by design
Sensitive data is filtered before reaching the model. Access is governed so agents receive only the information they're allowed to use.
Token optimization, real savings
Lower AI costs by delivering the right context instead of unnecessary tools. Better accuracy, faster responses, and fewer wasted tokens.
API Contract Diff Checker for OpenAPI Schema Audits
This is for backend engineers and API designers who need to ensure their changes don't break production for their users. It solves the headache of manual schema auditing and versioning guesswork.
Backend Engineer
Verifies that a new deployment won't crash mobile or web apps using the API.
API Designer
Checks if new GraphQL fields follow the existing schema rules before publishing.
DevOps Engineer
Automates the versioning logic for CI/CD pipelines to ensure consistent SemVer.
Frequently Asked Questions
Does the API Contract Diff Checker work with my REST API? +
Yes, it uses diff_openapi to handle RESTful specifications. It will check for removed paths, changed parameters, and other structural changes.
Can I use this to find breaking changes in GraphQL? +
Yes, it specifically supports GraphQL SDL strings via diff_graphql. It can identify if your changes will break existing queries or mutations.
How does it know if a change is breaking? +
It looks for structural changes that would cause existing clients to fail, such as removing a required endpoint or narrowing a data type.
Will it tell me what version number to use next? +
Yes, the evaluate_version_bump tool analyzes your identified changes and suggests whether you should use a MAJOR, MINOR, or PATCH increment.
Can I use this for my own internal API documentation? +
Absolutely. It is a great way to keep your internal documentation consistent and ensure that your own team doesn't break internal tools.
Do I need to provide the full JSON file? +
You can provide the relevant schema strings for either OpenAPI or GraphQL. Your agent can help you extract these from your files if needed.
What types of API contracts can I compare? +
You can compare OpenAPI specifications and GraphQL Schema Definition Language (SDL) strings.
How does the tool recommend a version bump? +
The evaluate_version_bump tool analyzes detected changes. A MAJOR bump is recommended for breaking changes, MINOR for additive changes, and PATCH for informational updates.
Can I detect type narrowing in OpenAPI? +
Yes, diff_openapi identifies type narrowing (e.g., changing a string to a specific regex pattern) as a breaking change.
Your AI, connected to everything.
No credit card required · Free tier available
Other MCPs in this category
ZenHub MCP
ZenHub MCP lets you manage your GitHub agile boards and project estimates using natural language. You can move issues between pipelines, update story points, and inspect epics without leaving your IDE. It connects your ZenHub account to your AI client so you can handle sprint planning and release tracking through simple chat commands.
Apideck MCP
Unify your software stack with Apideck. Manage CRM contacts, orchestrate Vault connections, and execute proxy requests across dozens of platforms through one API.
Blocknative (Ethereum Mempool API) MCP
Get real-time Ethereum gas price suggestions based on live mempool data from Blocknative.
Related MCPs
LinkedIn Authority Signal Calculator MCP
Quantify thought-leadership and authority markers in LinkedIn posts.
Fintoc MCP
Access bank accounts, movements, and initiate transfers via AI agents with Fintoc.
Classy.org MCP
Manage fundraising and donations via Classy (GoFundMe Pro). Track campaigns, monitor transactions, and manage supporters directly from any AI agent.