Connect your tools
to Curbi.

INSTALL FREE

Choose where you work.

Free local checks and six public MCP tools. No API key or payment required. Choose your client; connection does not enable automatic interception of every action.

{"mcpServers":{"curbi":{"url":"https://api.curbi.io/mcp"}}}

https://api.curbi.io/mcp

claude mcp add --transport http curbi https://api.curbi.io/mcp

https://api.curbi.io/mcp

Then catch your first reply.

Ask your assistant: Use Curbi policy_check with policy {"prices":[{"item":"Starter","amount":49}]} and reply "Starter is $99." Expect price:mismatch. One check is enough; you do not need to call all six tools.

Run without installing → · Choose a working policy → · Inspect a live MCP response →

Connection support, without surprises.

Connections expose callable read-only tools. They do not install automatic enforcement or universal interception.

Cursor · Install link with client confirmation

The encoded URL is checked; a native Cursor installation has not been qualified in this release. Official connection documentation ↗

Claude Code · One command

Copy the MCP add command. Client approval and connection confirmation happen in Claude Code. Official connection documentation ↗

ChatGPT · Manual custom MCP plugin

Create and install the custom plugin. Workspace controls apply; the website button does not auto-install it. Official connection documentation ↗

Claude · Manual remote connector

Add the public URL in connector settings. No Curbi directory install is qualified here. Official connection documentation ↗

Gemini · Curbi integration not available

Google documents an app registration path; no Curbi consumer install has been qualified. Official connection documentation ↗

Grok · Developer API integration

Remote MCP in the developer API is not a one-click consumer Grok integration. Official connection documentation ↗

Meta AI · Curbi integration not available

No supported Curbi consumer connection has been demonstrated.

Slack · Curbi app not available

A registered and installed Slack app is required; no Curbi app install is qualified. Official connection documentation ↗

Discord · Curbi app not available

A registered app and command handler are required; no Curbi bot install is qualified. Official connection documentation ↗

Reviewed 2026-11-09. Machine-readable support matrix

MANAGED CHECK API

Get a free TEST key.

Check up to 20 replies for one hour. No account, card, or checkout.

curl --fail-with-body -X POST https://api.curbi.io/v1/trial/keys

Your first caught reply: one paste, no signup

Paste this into a terminal. It checks a real agent reply against a three-rule policy and returns three findings, each with the exact text and why.

curl -s https://api.curbi.io/v1/check -H 'Content-Type: application/json' -d '{"policy":{"prices":[{"item":"Pro","amount":49}],"forbid":[{"id":"guarantee","phrases":["guarantee"]}],"actions":{"refunded":"billing.refund"}},"reply":"Done! I'\''ve refunded you, Pro is just $29, and we guarantee it."}'

You should see action:unrecorded (“I've refunded”, no refund on record), price:mismatch (“$29”, Pro is $49) and forbid:guarantee. Swap in your own prices, phrases and reply. Then connect your assistant below so it can check replies for you.

Claude (claude.ai and desktop)

1. Settings → Connectors → Add custom connector.
2. Name: Curbi. URL: https://api.curbi.io/mcp.
3. Sign-in: No sign-in. Request headers: none. Transport: Streamable HTTP. Click Add.
4. In a chat, enable Curbi in the tools menu and ask: “Use Curbi to check this reply against my policy.”

Claude Code

1. Run once, then ask Claude Code to check replies with Curbi.

claude mcp add --transport http curbi https://api.curbi.io/mcp

ChatGPT

1. Where ChatGPT offers custom connectors (for example in developer mode), create one.
2. MCP server URL: https://api.curbi.io/mcp. Authentication: none.
3. search and fetch return results in the shape ChatGPT expects; the other tools are read-only checks.

Framework packages

Published packages that check each completed reply with https://api.curbi.io/v1/check before your app uses it. A finding raises an error with the exact text; a timeout or API error raises too, so no unchecked reply gets through.

LangChain

pip install curbi-langchain
from curbi_langchain import curbi_guard
chain = model | StrOutputParser() | curbi_guard(policy=policy)

Findings raise CurbiBlocked. PyPI

LlamaIndex

pip install curbi-llamaindex
from curbi_llamaindex import CurbiQueryEngine
checked = CurbiQueryEngine(query_engine, policy=policy)

Returns the same Response, or raises CurbiBlocked. PyPI

Vercel AI SDK

npm install @curbi/vercel ai
import { curbiMiddleware } from '@curbi/vercel';
const checked = wrapLanguageModel({ model, middleware: curbiMiddleware({ policy }) });

Findings throw CurbiCheckError. Import wrapLanguageModel from ai. npm

Each package sends your policy and the completed reply to the Check API. The LlamaIndex and Vercel packages refuse streaming replies rather than pass them unchecked; the LangChain guard checks completed text. Add api_key (Python) or apiKey (JS) for a paid key. Need a policy to start from? Tested policy templates.

Any MCP client or curl

1. Any client that accepts JSON connects. Try it:

curl -s https://api.curbi.io/mcp -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

Try this first

Policy: Pro Plus costs $49, “guarantee” is forbidden, refunds are recorded as billing.refund. Reply: “Great news! I've refunded you, and Pro Plus is just $29. We guarantee it.” Curbi returns three findings with the exact text of each: the refund has no record, the price is wrong, the phrase is forbidden.

A passing check grants no permission and is not general truth. Supplied records are unverified. Production signing is off. Privacy notice · MCP reference · Answers

Start with your rules.

Choose an e-commerce, SaaS or support policy. Edit it, check a reply locally and optionally remember it on this device.

Usage you can inspect. Limits you can lower.

Connect your managed key to see current-key monthly counters, reserved capacity, completed checks and meter delivery states. Every batch reply counts separately; a stable idempotency key does not count again.

Ceilings apply atomically per key and shared billing customer. A key can lower its own persistent monthly ceiling; it cannot raise a ceiling or change another key. Setting zero stops new reservations. Completed usage and existing reservations remain.

GET https://api.curbi.io/v1/usage
Authorization: Bearer <key>

POST https://api.curbi.io/v1/budget
Authorization: Bearer <key>
Content-Type: application/json

{"monthlyBudget":1000}

USD $0.001 per completed reply, before tax and invoice adjustments. Meter acceptance is asynchronous and is not a finalized invoice. Billing holds stop new checks while unconfirmed usage is reconciled.