Your agent’s reply.
One structured check.

curl https://api.curbi.io/v1/check \
  -H 'Content-Type: application/json' \
  --data-binary @- <<'JSON'
{
  "version": "2026-11-01",
  "policy": {
    "prices": [
      {
        "item": "Starter",
        "amount": 49
      }
    ]
  },
  "reply": "Starter is $99 a month."
}
JSON

const res = await fetch('https://api.curbi.io/v1/check', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"version":"2026-11-01","policy":{"prices":[{"item":"Starter","amount":49}]},"reply":"Starter is $99 a month."}),
});
const result = await res.json();
console.log(result.pass, result.findings.map(f => f.rule));

import json, urllib.request  # standard library only

req = urllib.request.Request(
    "https://api.curbi.io/v1/check",
    data=json.dumps({"version":"2026-11-01","policy":{"prices":[{"item":"Starter","amount":49}]},"reply":"Starter is $99 a month."}).encode(),
    headers={"Content-Type": "application/json", "User-Agent": "curbi-quickstart/1.0"},  # the default urllib agent can be refused at the edge
)
result = json.load(urllib.request.urlopen(req))
print(result["pass"], [f["rule"] for f in result["findings"]])

curl -s https://api.curbi.io/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -H 'MCP-Protocol-Version: 2025-06-18' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"curbi-curl","version":"1.0.0"}}}' > /dev/null

curl -s https://api.curbi.io/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -H 'MCP-Protocol-Version: 2025-06-18' \
  -d '{"jsonrpc":"2.0","method":"notifications/initialized"}'

curl -s https://api.curbi.io/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -H 'MCP-Protocol-Version: 2025-06-18' \
  --data-binary @- <<'JSON'
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "policy_check",
    "arguments": {
      "version": "2026-11-01",
      "policy": {
        "prices": [
          {
            "item": "Starter",
            "amount": 49
          }
        ]
      },
      "reply": "Starter is $99 a month."
    }
  }
}
JSON

// Check every model reply in-process (source preview: revenue-engine/connectors)
import { wrapLanguageModel } from 'ai';
import { curbiMiddleware } from './connectors/src/ai-sdk.mjs';

const model = wrapLanguageModel({
  model: yourModel,
  middleware: curbiMiddleware({
    policy: {"prices":[{"item":"Starter","amount":49}]},
    fallback: 'A teammate will confirm that price.',
  }),
});