What exactly does Check validate?
Check validates commands, imports, and function calls before they are executed, returning a `RUNNABLE` or `INVALID` verdict.
C
Check MCP Server
@golproductions
Basic information
About Check MCP Server
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.
Check MCP Server 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"
}
}
}
}Check MCP Server tools
2Validates 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.
Frequently asked questions
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.
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