What is contract drift?

Contract drift occurs when a tool'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` tool to preview the specific test inputs that will be used to stress-test your tool's contract.

Tool Interface Contract Validator MCP Connector for Claude

A+

Ensures tool implementations strictly adhere to declared input and output schemas via deterministic fuzz testing.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

Prevent contract drift in AI agent workflows. This MCP provides a validation engine that uses deterministic, schema-aware fuzz testing to verify that tool implementations match their declared interfaces. By testing boundary values and type transitions, it identifies type mismatches, missing required fields, and unexpected extra fields. Use validate_contract to verify implementations, generate_test_suite to preview stress-test inputs, and analyze_compliance_report to categorize failures.

validationfuzz-testingschemacontract-testingai-agents

Connect to Claude

Subscribe on Vinkius, then add this connector to Claude.ai or Claude Code.

① Claude.ai (web app)

Go to Settings → Connectors → Add custom connector
Paste the MCP endpoint URL below

https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/mcp

② Claude Code (terminal)

claude mcp add --transport http tool-interface-contract-validator https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/mcp

③ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "tool-interface-contract-validator": {
      "url": "https://edge.vinkius.com/vk_preview_51fH8i3RG8gHcmJrIRC3JWYn79gq3qKzdx39r97g/mcp"
    }
  }
}

Get full access on Vinkius

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Details

Tools: 3
Grade: A+
Score: 100/100
Updated: Oct 1, 2026

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