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Check

@golproductions

Repository

About Check

Anti-hallucination firewall for AI coding agents. Validates commands before execution, imports against your package.json, function calls against your source files. Sub-100ms. $0.0068 AUD per check, 120 free on sign-up.

#command-validation#ai-agents#security#preflight#firewall#devtools#mcp

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "Check": {
      "command": "npx",
      "args": [
        "@golproductions/check-mcp"
      ],
      "env": {
        "GOL_CLIENT_ID": "your_key"
      }
    }
  }
}

Tools

2

Validates a command, returns `RUNNABLE` or `INVALID`

Validates then executes, blocking invalid commands before they reach the shell

Overview

What is Check?

Check is an MCP server that acts as an anti-hallucination firewall for AI agents. It validates commands, imports, and function calls before execution, returning a verdict of RUNNABLE or INVALID in under 100 milliseconds. It contains no AI of its own.

How to use Check?

Install by adding a configuration entry to your MCP client's mcpServers, specifying the command npx -y @golproductions/check-mcp and setting the environment variable GOL_CLIENT_ID to your API key. After setup, you can invoke the Check tool to validate a command or the CheckAndExecute tool to validate and then run it, blocking invalid commands before they reach the shell.

Key features of Check

  • Validates commands, imports, and function calls prior to execution.
  • Returns verdicts in under 100 milliseconds.
  • Free tier of 120 checks on signup.
  • No AI inside – purely deterministic validation.
  • Works with any MCP-compatible client.
  • Blocks invalid commands before they reach the shell.

Use cases of Check

  • Preventing AI agents from executing hallucinated or unsafe shell commands.
  • Securing development workflows that rely on AI-generated code with function calls.
  • Adding a validation layer before running imports or external commands in automated pipelines.
  • Auditing agent-generated actions in real time without slowing down the process.

FAQ from Check

What exactly does Check validate?

Check validates commands, imports, and function calls before they are executed, returning a RUNNABLE or INVALID verdict.

How do I get an API key?

You can get a free API key (with 120 free checks) at golproductions.com/check.

What tools does the Check MCP server provide?

It provides two tools: Check (validates without executing) and CheckAndExecute (validates and then executes if safe).

Which MCP clients are supported?

Check works with any MCP-compatible client, including Claude Code, Cursor, Windsurf, Devin Desktop, Continue, Amazon Q, Roo Code, and Claude Desktop.

What is the pricing after the free tier?

Each check costs $0.0068 AUD. There is no subscription; you pay per use.

Frequently asked questions

What exactly does Check validate?

Check validates commands, imports, and function calls before they are executed, returning a `RUNNABLE` or `INVALID` verdict.

How do I get an API key?

You can get a free API key (with 120 free checks) at [golproductions.com/check](https://www.golproductions.com/check.html).

What tools does the Check MCP server provide?

It provides two tools: `Check` (validates without executing) and `CheckAndExecute` (validates and then executes if safe).

Which MCP clients are supported?

Check works with any MCP-compatible client, including Claude Code, Cursor, Windsurf, Devin Desktop, Continue, Amazon Q, Roo Code, and Claude Desktop.

What is the pricing after the free tier?

Each check costs $0.0068 AUD. There is no subscription; you pay per use.

Comments

Basic information

Category

Other

Transports

stdio

Author

golproductions

Submitted by

Mr Traumatik

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