AISchemaGate validates and repairs structured LLM output against a contract, plus DataContractGate.
Connect Runs on your machine
claude mcp add contractgate -e CONTRACTGATE_API_KEY=<CONTRACTGATE_API_KEY> -e CONTRACTGATE_BASE_URL=<CONTRACTGATE_BASE_URL> -- npx -y @nightmoose/[email protected]
{
"mcpServers": {
"contractgate": {
"command": "npx",
"args": [
"-y",
"@nightmoose/[email protected]"
],
"env": {
"CONTRACTGATE_API_KEY": "<CONTRACTGATE_API_KEY>",
"CONTRACTGATE_BASE_URL": "<CONTRACTGATE_BASE_URL>"
}
}
}
}
{
"mcpServers": {
"contractgate": {
"command": "npx",
"args": [
"-y",
"@nightmoose/[email protected]"
],
"env": {
"CONTRACTGATE_API_KEY": "<CONTRACTGATE_API_KEY>",
"CONTRACTGATE_BASE_URL": "<CONTRACTGATE_BASE_URL>"
}
}
}
}
{
"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
| Name | Description |
|---|---|
CONTRACTGATE_API_KEYRequired, secret | DataContractGate API key (cg_live_...). Create one at https://app.datacontractgate.com/account |
CONTRACTGATE_BASE_URLOptional | Gateway base URL. Defaults to https://api.datacontractgate.com |
Details
| Package | @nightmoose/[email protected] (NPM, stdio) |
| First published | 28 Oct 2026 |
| Last updated | 28 Oct 2026 |
| Registry name | io.github.nightmoose/contractgate |
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