API Contract Breaker Detector Connector for AI agents.
3 live capabilities
Prevent breaking API changes in distributed systems
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Why people use API Contract Breaker Detector
Stop breaking downstream services with API Contract Breaker Detector
With this MCP, that manual guesswork disappears. Your agent scans your actual code to build a real-time registry of your API structure. When you make a change, it compares the new code to the baseline and tells you exactly what broke. You get certainty instead of anxiety.
What Vinkius changes
You stop breaking downstream services by catching API mismatches during development.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 6,100+ Connectors
- Real-world use case 01
Preventing accidental endpoint deletion
A developer removes an unused-looking endpoint, but your agent uses check_for_breaking_changes to warn that a legacy service still relies on it.
- Real-world use case 02
Validating type changes during refactoring
You change an integer ID to a string UUID; your agent flags the mismatch against the registry before the code is even committed.
- Real-world use case 03
Onboarding to a new microservice
A new engineer uses query_contract_details to quickly understand the exact shape of the data required for a specific API path.
Complete set · 3capabilities
The complete API Contract Breaker Detector capability set.
These are the exact actions your AI can choose when you ask it to work with API Contract Breaker Detector.
01—03
3 capabilities in this set.
Part of 3 available through API Contract Breaker Detector.
- 01 Capability
Check for breaking changes
Compares your current code against the stored registry to find contract violations. It flags removed endpoints or changed types immediately.
- 02 Capability
Query contract details
Retrieves the full definition of a specific contract from your registry. Use this to inspect exact parameter requirements or return objects.
- 03 Capability
Register api contracts
Saves your current API definitions into the registry to create a baseline. You can specify framework types to prioritize the scan.
Set up in minutes
One URL. Then ask API Contract Breaker Detector to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use API Contract Breaker Detector from the conversation.
Choose your client
Live previewAdvanced clients IDE · CLI
Claude · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp - Step 01
Open Connectors
In Claude Web or Claude Desktop, open Settings and choose Connectors.
- Step 02
Add the URL
Choose Add custom connector, name it API Contract Breaker Detector, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable API Contract Breaker Detector for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp - Step 01
Open MCP settings
On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
- Step 02
Add the URL
Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the API Contract Breaker Detector URL.
- Step 03
Save and start
Save the connection and enable API Contract Breaker Detector in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"api-contract-breaker-detector": {
"url": "https://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp"
}
}
}- Step 01
Open MCP Settings
Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
- Step 02
Add the server config
Paste the JSON configuration above into the mcp.json file that opens
- Step 03
Save the file
Cursor will automatically detect the new Connector
- Step 04
Start using API Contract Breaker Detector
Open Agent mode in chat and ask: "Using API Contract Breaker Detector, help me...". 3 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"api-contract-breaker-detector": {
"url": "https://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp"
}
}
}- Step 01
Create MCP config
Create a .vscode/mcp.json file in your project root
- Step 02
Add the server config
Paste the JSON configuration above
- Step 03
Enable Agent mode
Open GitHub Copilot Chat and switch to Agent mode using the dropdown
- Step 04
Start using API Contract Breaker Detector
Ask Copilot: "Using API Contract Breaker Detector, help me...". 3 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"api-contract-breaker-detector": {
"url": "https://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp"
}
}
}- Step 01
Open MCP Settings
Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
- Step 02
Add the server
Paste the JSON configuration above into mcp_config.json
- Step 03
Save and reload
Windsurf will detect the new server automatically
- Step 04
Start using API Contract Breaker Detector
Open Cascade and ask: "Using API Contract Breaker Detector, help me...". 3 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"api-contract-breaker-detector": {
"url": "https://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp"
}
}
}- Step 01
Open Cline MCP Settings
Click the Connectors icon in the Cline sidebar panel
- Step 02
Add remote server
Click "Add Connector" and paste the configuration above
- Step 03
Enable the server
Toggle the server switch to ON
- Step 04
Start using API Contract Breaker Detector
Ask Cline: "Using API Contract Breaker Detector, help me...". 3 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add api-contract-breaker-detector --transport http "https://edge.vinkius.com/vk_preview_YeJgQHCnSbmKU0xSykEdZnqaw5Tkqwkw63mRpiGy/mcp"- Step 01
Install Claude Code
Run npm install -g @anthropic-ai/claude-code if not already installed
- Step 02
Add the Connector
Run the command above in your terminal
- Step 03
Verify the connection
Run claude mcp to list connected servers, or type /mcp inside a session
- Step 04
Start using API Contract Breaker Detector
Ask Claude: "Using API Contract Breaker Detector, show me...". 3 tools are ready
Where the request belongs
Work API Contract Breaker Detector can move forward.
Backend engineers and platform teams who manage complex, distributed microservices and want to prevent breaking changes from reaching production.
Backend Engineer
Uses this to ensure a refactor doesn't accidentally break a consumer's integration.
Platform Engineer
Uses this to maintain strict API standards across multiple microservices.
QA Engineer
Uses this to validate that new code deployments adhere to established API contracts.
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Bring your own AI
Change the model, client or framework. Keep API Contract Breaker Detector connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
ZCode -
Cline -
Zed -
Continue -
Kiro -
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Zencoder -
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Before you connect
Questions about API Contract Breaker Detector.
The practical details behind the request, access and result.
How can I prevent API breaking changes with this MCP?
You use this MCP to compare your current code against a saved baseline of your API definitions. It flags any mismatches in paths, parameters, or types before they cause issues.
Does the API Contract Breaker Detector work with Express or FastAPI?
Yes, it is designed to scan codebases using FastAPI, Express, GraphQL, and TypeScript to extract and validate your API structures.
Can I use this to check my GraphQL schemas?
Yes, the MCP can scan GraphQL definitions to ensure that changes to your schema don't break existing queries or mutations.
How do I set up a baseline for my API contracts?
You simply instruct your agent to register the current API definitions. This creates a source of truth in the registry that all future checks will be measured against.
What happens if I change a parameter type in my code?
The MCP will detect the discrepancy between your new code and the registered contract, alerting you that the parameter type no longer matches the established baseline.
How do I start using this capability?
First, run register_api_contracts to scan your codebase and create a baseline registry of your current API definitions.
What is considered a breaking change?
A breaking change includes removing an endpoint, changing a URL path, renaming a parameter, changing a parameter type, or removing a field from a response body.
Does adding a new endpoint trigger a breaking change alert?
No, adding new endpoints or adding optional parameters are not considered breaking changes.
One connection away
Give your agent a direct line to API Contract Breaker Detector.
Connect API Contract Breaker Detector once. Keep it beside 6,100+ managed Connectors when the next task needs more.
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