How to Use the Counterfactual-Variant Prover MCP in Claude Code

Q: How do I add Counterfactual-Variant Prover to Claude Code?

Run the command claude mcp add --transport http counterfactual-variant-prover -- in your terminal. This registers the server to your CLI configuration.

Add first-principles logic verification to your terminal pipelines with Claude Code.

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Connect Counterfactual-Variant Prover MCP to Claude Code

Create your Vinkius account to connect Counterfactual-Variant Prover to Claude Code 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 Code

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Headless logic verification for terminal pipelines

The `validate_counterfactual` tool brings strict logic verification directly to your CLI workflows. Run this MCP Server inside Claude Code to verify custom puzzle rules and variables before piping output to other command-line tools. By forcing cognitive decontamination at the terminal level, you prevent broken assumptions from entering your scripts. The tool acts as a gatekeeper for automated logic processing.

Prevent recitation bias in Claude Code scripts

The `validate_counterfactual` tool intercepts logic commands and strips away memorized templates. Your agent must construct a step-by-step mathematical proof based purely on your input arguments. If the agent attempts to output a classic riddle answer instead of calculating your modified values, the CLI tool halts execution. You get clean, verified terminal outputs every single time.

Automated variable isolation for SSH and CI/CD

The `validate_counterfactual` tool isolates input variables and maps discrepancies automatically during headless runs. This allows your agent to run reliable logic checks inside Docker containers or GitHub Actions without manual oversight. Because the tool rejects contaminated logic, your CI/CD pipelines can catch logical errors early. You ensure that only mathematically sound configurations pass your build stages.

Setup guide

Set up Counterfactual-Variant Prover MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see counterfactual-variant-prover-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest Counterfactual-Variant Prover transactions." It will automatically discover and invoke the available Counterfactual-Variant Prover tools.

Terminal

claude mcp add --transport http counterfactual-variant-prover-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

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Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the Counterfactual-Variant Prover MCP

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

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

{
  "mcpServers": {
    "counterfactual-variant-prover-mcp": {
      "type": "url",
      "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 Code

Run the command `claude mcp add --transport http counterfactual-variant-prover -- ` in your terminal. This registers the server to your CLI configuration.

Yes, this server runs seamlessly in headless environments. The validation tool ensures your scripts execute with mathematically sound logic without human intervention.

The validation tool checks logic consistency, not code syntax. It returns structured errors if your logic variables conflict with classic puzzle rules.

Yes, because Claude Code runs in the terminal, you can pipe the verified logic outputs directly to grep, jq, or local script files.

All computations execute in a secure, zero-trust sandbox. Your logic variables and prompt rules are processed ephemerally and never written to disk.

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