Index / MCP servers / API Contract Validator

API Contract Validator MCP server

API Contract Validator is an MCP server with 5 tools an agent can call, among them check_breaking_changes, diff_request_response, generate_mock_from_spec. It answers at https://api.lazy-mac.com/api-contract-validator/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 11 September 2026; the last check, on 22 October 2026, succeeded.

Status

Answering

Tools

Reliability

6 of 6 checks

Response time

219 ms

Transport

streamable HTTP

Last checked

22 October 2026

Cloudflare Workers MCP server: api-contract-validator

Description as the publisher wrote it.

The 5 tools API Contract Validator offers

Tool	What it does
`check_breaking_changes`	Compare two OpenAPI spec versions to detect breaking changes: removed paths/operations, new required parameters, removed response codes, operationId renames. Inputs: spec_old, spec_new
`diff_request_response`	Compare a real HTTP request/response against an OpenAPI spec contract. Returns per-field violations. Inputs: spec, request, response
`generate_mock_from_spec`	Generate mock response data from an OpenAPI spec. Uses examples, defaults, formats, and type heuristics. Inputs: spec, path, method, statusCode
`lint_api_schema`	Lint an API spec for quality and best practice compliance. Rules: operation-id-kebab-case, response-success-required, tags-defined, no-empty-description, security-defined. Inputs: spec, rules
`validate_openapi_spec`	Validate an OpenAPI 3.x or AsyncAPI spec JSON. Returns structural errors, missing required fields, and warnings. Inputs: spec, strict

Add API Contract Validator to your AI client

Every block below points at https://api.lazy-mac.com/api-contract-validator/mcp. Pick your client and copy.

Claude Code: one command in your terminal

claude mcp add --transport http api-contract-validator https://api.lazy-mac.com/api-contract-validator/mcp

Claude Desktop: claude_desktop_config.json

{
  "mcpServers": {
    "api-contract-validator": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://api.lazy-mac.com/api-contract-validator/mcp"]
    }
  }
}

Cursor: ~/.cursor/mcp.json, or .cursor/mcp.json in a project

{
  "mcpServers": {
    "api-contract-validator": {
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

VS Code and GitHub Copilot: .vscode/mcp.json

{
  "servers": {
    "api-contract-validator": {
      "type": "http",
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Zed: Zed settings.json

{
  "context_servers": {
    "api-contract-validator": {
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Windsurf: ~/.codeium/mcp_config.json

{
  "mcpServers": {
    "api-contract-validator": {
      "serverUrl": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

JetBrains AI Assistant: Settings, Tools, AI Assistant, MCP, New MCP Server, as JSON

{
  "mcpServers": {
    "api-contract-validator": {
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Continue: .continue/mcpServers/neuronto.yaml

name: API Contract Validator
version: 0.0.1
schema: v1
mcpServers:
  - name: API Contract Validator
    type: streamable-http
    url: https://api.lazy-mac.com/api-contract-validator/mcp

Gemini CLI: ~/.gemini/settings.json

{
  "mcpServers": {
    "api-contract-validator": {
      "httpUrl": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Codex CLI: MCP server config

{
  "mcpServers": {
    "api-contract-validator": {
      "type": "http",
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Warp: MCP servers, + Add, paste JSON

{
  "mcpServers": {
    "api-contract-validator": {
      "url": "https://api.lazy-mac.com/api-contract-validator/mcp"
    }
  }
}

Goose: a one-click extension link

goose://extension?url=https%3A%2F%2Fapi.lazy-mac.com%2Fapi-contract-validator%2Fmcp&type=streamable_http&id=api-contract-validator&name=API%20Contract%20Validator

Is API Contract Validator up right now?

It answered our last check on 22 October 2026 in 219 ms. Over 6 checks since 11 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.

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Questions about API Contract Validator

How many tools does API Contract Validator have?

5, as returned by the server's own tools/list on 15 September 2026: check_breaking_changes, diff_request_response, generate_mock_from_spec, lint_api_schema, validate_openapi_spec.

Is API Contract Validator down?

It answered our last check on 22 October 2026 in 219 ms. Over 6 checks since 11 September 2026 it answered 6.

How do I add API Contract Validator to Cursor?

Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://api.lazy-mac.com/api-contract-validator/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.

Does API Contract Validator need an API key?

It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.

Where this comes from

Publisher: io.github.lazymac2x. Endpoint host: api.lazy-mac.com. ARD identifier: urn:air:io.github.lazymac2x:mcp:api-contract-validator. First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page is inferred from its name. Ranking in Neuronto search is never for sale.

Is this your server? Get a message the day it stops answering or its tools change: monitoring, 14 days free. Or claim the domain to manage how it is listed.