Validate MCP Server

by machinegradeio.github.machinegrade/validatev0.1.2

Deterministic validation of AI-generated artifacts: JSON Schema and OpenAPI response conformance and per-dialect SQL syntax, with typed verdicts and fix hints.

1Node.jsstdioremoteofficial registry

context tax

queued

security

queued

cold start

queued

freshness

Maintained3mo ago

Install Validate MCP server

claude mcp add validate -e SANDBOX_API_KEY='<sandbox-api-key>' -- npx -y @machinegrade/validate

{
  "mcpServers": {
    "validate": {
      "command": "npx",
      "args": [
        "-y",
        "@machinegrade/validate"
      ],
      "env": {
        "SANDBOX_API_KEY": "<sandbox-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "validate": {
      "command": "npx",
      "args": [
        "-y",
        "@machinegrade/validate"
      ],
      "env": {
        "SANDBOX_API_KEY": "<sandbox-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "validate": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@machinegrade/validate"
      ],
      "env": {
        "SANDBOX_API_KEY": "<sandbox-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "validate": {
      "command": "npx",
      "args": [
        "-y",
        "@machinegrade/validate"
      ],
      "env": {
        "SANDBOX_API_KEY": "<sandbox-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
SANDBOX_URL	—	—	Base URL of the validate API
SANDBOX_API_KEY	yes	yes	API key issued via POST https://api.machinegrade.dev/keys (free tier: 500 calls/month)

Remote endpoints

streamable-httphttps://api.machinegrade.dev/mcp

Freshness

Maintained — last maintenance signal 3mo ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-07-26 · 3mo ago · GitHub
Latest release
2026-07-26 · 3mo ago · GitHub · v0.1.2
Package published
no data · npm/PyPI
Registry entry updated
2026-07-26 · 3mo ago · official registry · v0.1.2

FAQ

›How do I install the Validate MCP server in Claude Code?

Run: claude mcp add validate -e SANDBOX_API_KEY='<sandbox-api-key>' -- npx -y @machinegrade/validate. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Validate require an API key?

Yes. It expects SANDBOX_API_KEY, of which 1 is a secret.

›Can I use Validate as a remote (hosted) MCP server?

Yes — it offers both a hosted endpoint and a local stdio package.

›Is Validate in the official MCP registry?

Yes, as io.github.machinegrade/validate.