MCPs › Data & APIs › validate
Validate agent-generated artifacts against a contract before acting on them. Three validators: JSON Schema conformance, OpenAPI response conformance, SQL syntax (per dialect). Returns a typed verdict — {valid, errors[{path, code, message, fix_hint}], latency_ms} — with HTTP 200 even when invalid: an invalid artifact is a normal outcome, not an error. Deterministic and fast (~ms, no LLM in the loop), so it's cheaper than an LLM retry and safe to run on every generation. Free tier: 500 calls/month, self-service API key. MCP stdio adapter included; plain HTTP API underneath.
Not monetized yet
Turn validate’s tool calls into revenue: one disclosed sponsored slot, 70% revenue share, fail-open by design.
Install validate
For anyone using validate — no Lulu account neededclaude mcp add --transport http validate https://validate--machinegrade.run.tools
9 field-tested tactics as a designed playbook plus skills your coding agent can run. Free.
Get the Kit →FAQ
Run: claude mcp add --transport http validate https://validate--machinegrade.run.tools
Yes — it’s a remote MCP server, so no local install is needed.
ChatGPT: Settings → Connectors → Advanced → Developer mode → Add connector, then paste https://validate--machinegrade.run.tools.
Claude.ai: Settings → Connectors → Add custom connector, then paste the same URL.
Unrated out of 100, computed from cross-registry traction signals (installs, stars, registry presence) — never influenced by sponsorship.
Similar servers
Works well together
Your server?
This is for the person who owns validate — adds Lulu Ads to your own code. Not the install steps above, those are for your users.
Copies a ready prompt: your coding agent installs the lulu-ads SDK, wires the slot, and applies the widget design guide.
or set up manually at getlulu.dev/publishers
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Managed hosting with monetization built in — waitlist.
[](https://getlulu.dev/mcps/validate-a3a413)