How to Use the YC Startup Prover MCP in Cursor

Turn Cursor into a Y Combinator partner. Rip apart your business logic and feature bloat before you start writing the code.

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Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers — Included with Plan

Connect YC Startup Prover MCP to Cursor

Create your Vinkius account to connect YC Startup Prover to Cursor — we handle the hosting, security, and runtime updates so you don't have to. No server setup required.

GDPR Included with Plan

Setup YC Startup Prover with Cursor

Ask AI about this MCP

ChatGPT

Claude

Perplexity Vinkius runs on Gemini

Gemini

Grok

Validate ideas via MCP Server

Before you open a new file, the `validate_yc_startup` tool makes your AI client audit your entire product strategy against Paul Graham's rules. It looks for a specific problem experienced by real people who currently pay to solve it badly. If you are building an automated glaze-mixing machine for potters without asking if mixing is actually their bottleneck, the system flags you for solution seeking. The evaluation requires you to name five specific people who have the problem and quantify their willingness to pay. It stops developers from spending six months engineering a perfect system that nobody actually wants to buy. You find out immediately if your core assumption is flawed.

Enforce unscalable beginnings

Code scales easily, which makes developers lazy about customer discovery. Your agent will ask how you plan to manually onboard your first users. You must prove you are doing things that do not scale, like personally delivering the product and watching the user interact with it. The system demands weekly user conversations. It asks what your users said that you did not want to hear. If you design a technical product without talking to the target market, you end up like the woodworker who built shelves that do not fit standard wall studs. The audit forces you to talk to people before you type.

Focus Cursor on one thing

Developers love adding features. The evaluation asks what your software does ten times better than the alternative. If your answer takes more than one sentence, you lack focus. A product with forty-seven mediocre features loses to a product that does one specific thing exceptionally well. You also have to prove your unit economics. The system forces a calculation of your default alive or dead status. It demands real metrics like monthly recurring revenue and weekly retention. If you point to free signups or GitHub stars, the audit rejects those as vanity metrics.

Setup guide

Set up YC Startup Prover MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the YC Startup Prover MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent YC Startup Prover transactions." If the MCP tools are loaded correctly, Cursor will call the YC Startup Prover tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

{
  "mcpServers": {
    "yc-startup-prover-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by YC Startup Prover. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

Why Choose Vinkius

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

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Real-time monitoring

Live

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Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

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Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about YC Startup Prover MCP in Cursor

Create an mcp.json file in your project root or global settings directory. Add the server details, switch your chat to Agent mode, and ask it to review your README or spec.

You probably pitched a solution instead of a problem. The system rejects ideas that lack specific user pain points or fail to demonstrate a clear willingness to pay from a defined target market.

No. It prevents you from writing useless code. It evaluates your market strategy and product focus so you do not waste months building something nobody wants.

The system audits your strategy around metrics. It forces you to define how you will measure weekly retention and MRR rather than pulling live database numbers.

Your market validation and business plan text remain local to your editor and your chosen AI model. The MCP Server processes the evaluation locally without saving your proprietary ideas to a third-party server.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

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