AISchemaGate and DataContractGate MCP server

ContractGate

Semantic Contract Enforcement at Ingestion — Patent Pending

Stop bad data before it reaches your warehouse, lakehouse, or ML pipeline.

ContractGate is a high-performance validation gateway that enforces rich semantic data contracts in real time. Built in Rust for sub-millisecond per-event validation (86k+ events/sec/core), it goes far beyond JSON Schema or basic type checks — ontology, glossary, patterns, enums, computed metrics, and automatic inference.

<!-- LATENCY NOTE (measured 2026-05-24): Per-event validation p99 latency is 31 µs server-side, measured with warm compiled-contract cache. This exceeds the <15 ms p99 end-to-end budget (network + DB) by 500x. Performance is driven by Rust + Axum core with zero-copy contract matching. See ops/bench/ for reproducible benchmark. -->

Live demo → app.datacontractgate.com/stream-demo

Using Claude, Cursor, or Codex? Paste this

https://app.datacontractgate.com/llm-integration.md
https://github.com/nightmoose/contractgate

implement this in my repo

Your agent reads the integration playbook (source), finds your event shape, infers a contract from real samples, deploys it, wires your producer to /v1/ingest, and verifies with a dry run before anything is written. Machine index: /llms.txt.

MCP (Cursor, Claude Desktop, Windsurf, Copilot, Codex):

{
  "mcpServers": {
    "contractgate": {
      "command": "npx",
      "args": ["-y", "@contractgate/mcp-server"],
      "env": {
        "CONTRACTGATE_API_KEY": "${CONTRACTGATE_API_KEY}"
      }
    }
  }
}

Tools and auth: docs/mcp-reference.md.

Claude Code / Cursor plugin:

/plugin marketplace add nightmoose/contractgate
/plugin install contractgate@contractgate

Redpanda Connect (HTTP processor, no custom plugin): docs/examples/redpanda-connect/.

Try it in 10 minutes (Self-Hosted Free)

No Supabase account. No API keys. No sign-up.

git clone https://github.com/nightmoose/contractgate.git
cd contractgate
make demo

Opens at http://localhost:3000 — dashboard pre-loaded with three starter contracts and a live event stream. First build ~3 min, subsequent runs instant (Docker layer cache).

make demo-reset   # wipe + reseed (clean slate)
make demo-down    # stop and remove volumes
make demo-logs    # follow all service logs

Self-Hosted Free runs the real gateway binary — not a sandbox.

Unlimited local events, full YAML editor, playground, audit log.

Feature comparison below ↓

Key Features

• Semantic YAML Contracts — entities, types, patterns, enums, required fields, glossary, and computed metrics
• Real-time Validation — at ingestion (Kafka, HTTP, batch) with sub-millisecond per-event validation
• Visual Contract Builder — intuitive UI + live YAML preview (Cloud)
• AI-Powered Inference — paste sample JSON → instantly generates a full contract (Cloud)
• Quarantine + Replay — automatically hold and replay violating events (Cloud)
• Versioned Contracts — draft → stable → deprecated with compliance mode (Cloud)
• High Performance — Rust + Axum core, 86k+ events/sec/core
• Polyglot — Rust engine, Python SDK, CLI, Kafka Connect, Next.js dashboard

Self-Hosted Free vs Cloud

Shortened. The full README is on GitHub.