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How to connect ClickHouse to Claude

Connect Claude Web, Desktop and Cowork to ClickHouse MCP. Show total user signups for last week, summarize top 5 products by revenue, and more using natural language, with authentication handled for you.

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Basic

ClickHouse is an open-source, column-oriented database for real-time analytics and big data processing using SQL. Its lightning-fast query performance makes it ideal for handling large datasets and delivering instant insights.

6 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your ClickHouse account to Claude via Composio Connect, enabling it to show total user signups for last week, summarize top 5 products by revenue, insert a new sales record into database, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate ClickHouse with

Claude CodeCursorChatGPTAntigravityOpenAI Agents SDKClaude Agent SDKCodexGrok BuildVS CodeOpenCodeOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting ClickHouse to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your ClickHouse account

Back in Claude, ask it to connect to ClickHouse or give it any ClickHouse-related task.

For example, ask Claude to:

  • "Show total user signups for last week"
  • "Summarize top 5 products by revenue"
  • "Insert a new sales record into database"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your ClickHouse account is ready to use.

What is the ClickHouse Claude Connector, and what's possible with it?

The ClickHouse MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your ClickHouse account. It provides structured and secure access so your agent can perform ClickHouse operations on your behalf.

Troubleshooting

1. Why does Claude not use the Composio connector for ClickHouse?

The connector can show as connected, but Claude must use it in each ClickHouse conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to ClickHouse again.

2. Why does Claude show an MCP server error before ClickHouse connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for ClickHouse.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect ClickHouse.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the ClickHouse authorization link not work?

The Composio connector is one server. Your ClickHouse account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the ClickHouse connection.
  • Composio creates a fresh ClickHouse authorization link.
  • Open that link in your browser and finish the ClickHouse sign-in.

4. Why do ClickHouse actions fail after they worked before?

The ClickHouse connection can expire or lose permission.

  • Ask Claude to inspect the ClickHouse connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the ClickHouse account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in ClickHouse.
  • If the action still fails with a permission error, check that the connected account has that permission in ClickHouse itself.

5. How do I switch to a different ClickHouse account?

Claude can manage the ClickHouse connection for you.

  • Ask Claude to disconnect or delete the current ClickHouse account.
  • Ask Claude to connect ClickHouse again.
  • Open the new Composio authorization link for ClickHouse.
  • Sign in with the other ClickHouse account in the browser.
  • After the account connects, ask Claude to retry the ClickHouse task.

6. Why is my ClickHouse connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your ClickHouse connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If ClickHouse tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect ClickHouse.
TOOLS

Supported Tools

Every ClickHouse action and event your agent gets out of the box.

Execute ClickHouse Query

Execute a SQL query in ClickHouse and return the results.

Get Database Schema

Get comprehensive schema overview of an entire database including all tables and optionally their column definitions.

Get ClickHouse Play Interface

Get the ClickHouse Play web user interface for interactive query execution.

Get Table Schema

Get detailed schema information for a specific table including column definitions, types, keys, and optionally sample data.

List ClickHouse Databases

List all databases in the ClickHouse instance.

List ClickHouse Tables

List tables in ClickHouse databases.

FRAMEWORKS

How to build ClickHouse MCP Agent with another framework

Claude Code logo

Claude Code

Use ClickHouse MCP with Claude Code

Cursor logo

Cursor

Use ClickHouse MCP with Cursor

ChatGPT logo

ChatGPT

Use ClickHouse MCP with ChatGPT

Antigravity logo

Antigravity

Use ClickHouse MCP with Antigravity

OpenAI Agents SDK logo

OpenAI Agents SDK

Use ClickHouse MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use ClickHouse MCP with Claude Agent SDK

Codex logo

Codex

Use ClickHouse MCP with Codex

Grok Build logo

Grok Build

Use ClickHouse MCP with Grok Build

VS Code logo

VS Code

Use ClickHouse MCP with VS Code

OpenCode logo

OpenCode

Use ClickHouse MCP with OpenCode

OpenClaw logo

OpenClaw

Use ClickHouse MCP with OpenClaw

Hermes logo

Hermes

Use ClickHouse MCP with Hermes

Atomic Agent logo

Atomic Agent

Use ClickHouse MCP with Atomic Agent

Google ADK logo

Google ADK

Use ClickHouse MCP with Google ADK

LangChain logo

LangChain

Use ClickHouse MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use ClickHouse MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use ClickHouse MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use ClickHouse MCP with LlamaIndex

CrewAI logo

CrewAI

Use ClickHouse MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use ClickHouse MCP with Pydantic AI

AutoGen logo

AutoGen

Use ClickHouse MCP with AutoGen

FAQ

Frequently asked questions

With a standalone ClickHouse MCP server, the agents and LLMs can only access a fixed set of ClickHouse tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from ClickHouse and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right ClickHouse tools.

Yes, absolutely. You can configure which ClickHouse scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your ClickHouse data and credentials are handled as safely as possible.

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