Tool Interface Contract Validator Connector for AI agents.
3 live capabilities
Prevent runtime errors in agentic capability workflows
Waiting for input…
Why people use Tool Interface Contract Validator
Stop agent failures with capability Interface Contract Validator schema testing
This MCP changes that by bringing deterministic testing to your agent's capabilities. Instead of guessing, you use it to verify that every capability output matches your expectations perfectly. You get a clear, actionable report on exactly where the mismatch is, so you can fix the code and get back to building.
What Vinkius changes
You get a deterministic way to prove your capabilities won't break your agent's logic.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 6,100+ Connectors
- Real-world use case 01
Fixing broken agent loops
An agent keeps retrying a task because a capability returns a string instead of an integer.
- Real-world use case 02
Hardening capability inputs
You're worried a capability will crash if it receives a null value.
- Real-world use case 03
Verifying new capability deployments
You just wrote a new capability for your agent.
Complete set · 3capabilities
The complete Tool Interface Contract Validator capability set.
These are the exact actions your AI can choose when you ask it to work with Tool Interface Contract Validator.
01—03
3 capabilities in this set.
Part of 3 available through Tool Interface Contract Validator.
- 01 Capability
Generate test suite
- 02 Capability
Analyze compliance report
- 03 Capability
Validate contract
Set up in minutes
One URL. Then ask Tool Interface Contract Validator to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use Tool Interface Contract Validator 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_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable Tool Interface Contract Validator for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator URL.
- Step 03
Save and start
Save the connection and enable Tool Interface Contract Validator in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"tool-interface-contract-validator": {
"url": "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator
Open Agent mode in chat and ask: "Using Tool Interface Contract Validator, help me...". 3 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"tool-interface-contract-validator": {
"url": "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator
Ask Copilot: "Using Tool Interface Contract Validator, help me...". 3 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"tool-interface-contract-validator": {
"url": "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator
Open Cascade and ask: "Using Tool Interface Contract Validator, help me...". 3 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"tool-interface-contract-validator": {
"url": "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator
Ask Cline: "Using Tool Interface Contract Validator, help me...". 3 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add tool-interface-contract-validator --transport http "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/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 Tool Interface Contract Validator
Ask Claude: "Using Tool Interface Contract Validator, show me...". 3 tools are ready
Where the request belongs
Work Tool Interface Contract Validator can move forward.
This is for developers and AI engineers who are tired of debugging why their agents are failing in production due to unexpected data formats.
AI Engineer
Testing capability reliability and ensuring agentic loops don't break due to schema drift.
Backend Developer
Validating that API wrappers and capability implementations strictly follow defined contracts.
LLM Ops Engineer
Monitoring and auditing the interface integrity of capabilities used in production agent workflows.
Build the capability set
Add more capabilities.
Each Connector adds new actions and data without changing how you work.
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Box
Store, share, and collaborate on files securely with enterprise-grade cloud content management and governance controls.
Bring your own AI
Change the model, client or framework. Keep Tool Interface Contract Validator connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
ZCode -
Cline -
Zed -
Continue -
Kiro -
Roo Code -
Zencoder -
Goose -
Void -
Augment Code -
Amp -
Qodo -
Tabnine -
Pieces -
Sourcegraph Cody -
JetBrains -
Warp -
Amazon Q -
Antigravity -
BoltAI -
Raycast -
Jan -
LM Studio -
AnythingLLM -
Open WebUI -
Msty -
Cherry Studio -
LibreChat -
TypingMind -
Chorus -
5ire -
n8n -
LangChain -
LlamaIndex -
CrewAI -
Vercel AI SDK
Before you connect
Questions about Tool Interface Contract Validator.
The practical details behind the request, access and result.
How does the Capability Interface Contract Validator prevent agent loops?
It stops loops by ensuring capabilities return the exact data types your agent expects. When a capability returns a malformed response, the agent often tries to correct it repeatedly; this MCP catches those errors before they cause a loop.
Can I use Capability Interface Contract Validator with any AI client?
Yes, as long as your client is MCP-compatible, like Claude, Cursor, or Windsurf, you can use this to validate your capability implementations.
What makes the Capability Interface Contract Validator different from a standard JSON validator?
Standard validators just check data. This MCP includes fuzzing capabilities to generate difficult, edge-case inputs specifically designed to break your capability implementations.
Does Capability Interface Contract Validator work for custom capability implementations?
Absolutely. It is designed specifically to verify that your custom-coded capabilities strictly follow the JSON schemas you have defined for them.
How do I get a compliance score from the Capability Interface Contract Validator?
The engine automatically calculates a score based on how many fields and types match your schema during a validation sweep, giving you a clear metric of reliability.
What is deterministic schema-aware fuzzing?
It is a testing method where inputs are generated based on the constraints of a JSON schema. Unlike random fuzzing, it uses specific rules to target edge cases like boundary values and nullability while remaining structurally valid.
How does the validator detect errors?
The engine uses check_output_integrity to compare the actual capability output against the expected schema, identifying structural violations, type mismatches, or extra fields.
Can I use this with any AI client?
Yes. This MCP server can be connected to Cursor, VS Code, Claude Desktop, Windsurf, and any other MCP-compatible client via Vinkius Edge.
What is contract drift?
Contract drift occurs when a capability's actual behavior diverges from its documented interface, causing failures in LLM orchestrators like LangChain or CrewAI.
How does the validation work?
The engine uses deterministic schema-aware fuzzing to generate test cases based on your inputSchema, specifically targeting boundary values and type transitions.
Can I see the test cases before running validation?
Yes, you can use the generate_test_suite capability to preview the specific test inputs that will be used to stress-test your capability's contract.
One connection away
Give your agent a direct line to Tool Interface Contract Validator.
Connect Tool Interface Contract Validator once. Keep it beside 6,100+ managed Connectors when the next task needs more.
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