How to Use the Counterfactual-Variant Prover MCP in Claude

Stop Claude Desktop from hallucinating classic puzzle answers by enforcing strict, decontaminated logic checks.

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Connect Counterfactual-Variant Prover MCP to Claude Desktop

Create your Vinkius account to connect Counterfactual-Variant Prover to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Counterfactual-Variant Prover with Claude Desktop

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Force Claude Desktop to solve modified logic

Models often default to memorized patterns when they see a familiar puzzle. The `validate_counterfactual` tool forces the agent to stop, isolate the input variables, and map them against the standard rules. This prevents the common mistake where your agent simply recites a classic solution despite you changing the parameters. You get a clean derivation that ignores the original, irrelevant context.

Run first-principles derivation in Claude Desktop

Once the variables are isolated, the tool requires the model to compute the answer step-by-step. It treats the logic puzzle as a fresh calculation rather than a retrieval task. This MCP Server ensures the output stays grounded in your specific prompt instructions. Any trace of the original puzzle template is stripped away during the verification process.

Verify logic integrity within Claude Desktop

The tool acts as a final audit for your reasoning chains. It checks that the final answer is derived only from the modified values you provided. If the tool rejects the output, it means the agent relied on cached knowledge. You can then force a recalculation until the logic is entirely decontaminated.

Setup guide

Set up Counterfactual-Variant Prover MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Counterfactual-Variant Prover MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Counterfactual-Variant Prover MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under counterfactual-variant-prover-mcp.

json

{
  "mcpServers": {
    "counterfactual-variant-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 Counterfactual-Variant 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.

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Common questions about Counterfactual-Variant Prover MCP in Claude Desktop

Yes, it runs as a subprocess on your local machine. You configure it in your config file, and it hooks directly into the tools menu.

It uses the stdio transport to pipe your prompt variables into the tool. The agent then executes the logic check before it sends a final response.

It is designed specifically for logic puzzles with modified rules. It forces the agent to ignore standard shortcuts.

Your input variables never leave your local machine. The server only processes the logic puzzle parameters you feed into the chat.

The server identifies when the model's logic is contaminated by memorized templates. It forces the agent to recalculate from scratch.

Use it with your favorite AI tools

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

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