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AISchemaGate and DataContractGate

io.github.nightmoose/contractgate ยท v0.4.1

AISchemaGate validates and repairs structured LLM output against a contract, plus DataContractGate.

Connect Runs on your machine

Terminal
claude mcp add contractgate -e CONTRACTGATE_API_KEY=<CONTRACTGATE_API_KEY> -e CONTRACTGATE_BASE_URL=<CONTRACTGATE_BASE_URL> -- npx -y @nightmoose/[email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "contractgate": {
      "command": "npx",
      "args": [
        "-y",
        "@nightmoose/[email protected]"
      ],
      "env": {
        "CONTRACTGATE_API_KEY": "<CONTRACTGATE_API_KEY>",
        "CONTRACTGATE_BASE_URL": "<CONTRACTGATE_BASE_URL>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "contractgate": {
      "command": "npx",
      "args": [
        "-y",
        "@nightmoose/[email protected]"
      ],
      "env": {
        "CONTRACTGATE_API_KEY": "<CONTRACTGATE_API_KEY>",
        "CONTRACTGATE_BASE_URL": "<CONTRACTGATE_BASE_URL>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "contractgate": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@nightmoose/[email protected]"
      ],
      "env": {
        "CONTRACTGATE_API_KEY": "<CONTRACTGATE_API_KEY>",
        "CONTRACTGATE_BASE_URL": "<CONTRACTGATE_BASE_URL>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
CONTRACTGATE_API_KEY
Required, secret
DataContractGate API key (cg_live_...). Create one at https://app.datacontractgate.com/account
CONTRACTGATE_BASE_URL
Optional
Gateway base URL. Defaults to https://api.datacontractgate.com

Details

Package@nightmoose/[email protected] (NPM, stdio)
First published28 Oct 2026
Last updated28 Oct 2026
Registry nameio.github.nightmoose/contractgate

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