MCP Hydrolix

Name: MCP Hydrolix
Author: hydrolix

by hydrolixversion 0.2.3i★ –iRuns on your computer

Registry nameio.github.hydrolix/mcp-hydrolix

Install

Overview

Description from the maker (original English)

An MCP server to query Hydrolix

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: HYDROLIX_HOST, HYDROLIX_TOKEN, HYDROLIX_PASSWORD

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: HYDROLIX_HOST, HYDROLIX_TOKEN, HYDROLIX_USER, HYDROLIX_PASSWORD

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "hydrolix": {
      "command": "uvx",
      "args": [
        "mcp-hydrolix"
      ],
      "env": {
        "HYDROLIX_HOST": "your-value",
        "HYDROLIX_TOKEN": "your-value",
        "HYDROLIX_USER": "your-value",
        "HYDROLIX_PASSWORD": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add hydrolix --env HYDROLIX_HOST=your-value --env HYDROLIX_TOKEN=your-value --env HYDROLIX_USER=your-value --env HYDROLIX_PASSWORD=your-value -- uvx mcp-hydrolix

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "hydrolix": {
      "command": "uvx",
      "args": [
        "mcp-hydrolix"
      ],
      "env": {
        "HYDROLIX_HOST": "your-value",
        "HYDROLIX_TOKEN": "your-value",
        "HYDROLIX_USER": "your-value",
        "HYDROLIX_PASSWORD": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "hydrolix": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mcp-hydrolix"
      ],
      "env": {
        "HYDROLIX_HOST": "your-value",
        "HYDROLIX_TOKEN": "your-value",
        "HYDROLIX_USER": "your-value",
        "HYDROLIX_PASSWORD": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

HYDROLIX_HOST required env
The hostname of your Hydrolix server
HYDROLIX_TOKEN secret env
Service account token(alternative to username/password)
HYDROLIX_USER env
Hydrolix username (use with HYDROLIX_PASSWORD)
HYDROLIX_PASSWORD secret env
Hydrolix password (use with HYDROLIX_USER)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account hydrolix, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 18374 servers in this category
Published to the registry more recently than 5% of the other 18374 servers in this category
Basic checks equal to or better than 100% of the other 18374 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is MCP Hydrolix safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: HYDROLIX_HOST, HYDROLIX_TOKEN, HYDROLIX_PASSWORD

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.2.3) reached the registry 7 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Happo

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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Runs in the cloud★ 211Updated 2 days ago

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Happo

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Review Happo's visual and accessibility diffs: inspect comparisons, accept or reject, report flakes.

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Hydrolix MCP Server

An MCP server for Hydrolix.

Quickstart

Get up and running in a few minutes. This section covers Claude Desktop and Claude Code.

Step 1 — Prerequisites

Before you begin, make sure you have:

Hydrolix credentials — your cluster hostname plus either a username/password or a service account token. If you don't have these, ask your Hydrolix administrator.
Claude Desktop — download from claude.ai/download.

Step 2 — Install the MCP server

Choose the method that matches your setup:

Option A: Using uv (recommended)

uv manages Python automatically and downloads mcp-hydrolix on demand, so no separate install step is needed. If you don't have uv, install it:

macOS / Linux:

curl -LsSf https://astral.sh/uv/install.sh | sh

Windows (PowerShell):

powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

Option B: Using pip

Requires Python 3.13+. If you need to install Python, download it from python.org.

pip install mcp-hydrolix

Step 3 — Configure Claude Desktop

Open the Claude Desktop configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json
Linux: ~/.config/Claude/claude_desktop_config.json

Add the following entry to the "mcpServers" object (create the file with this content if it doesn't exist yet):

"mcpServers": { "mcp-hydrolix": { "command": "uvx", "args": [ "--python", "3.13", "--refresh-package", "mcp-hydrolix", "mcp-hydrolix" ], "env": { "HYDROLIX_URL": "https:// ", "HYDROLIX_USER": " ", "HYDROLIX_PASSWORD": " " } } } }

Replace , , and with your actual credentials.

[!NOTE]

If you used Option B (pip), use "command": "mcp-hydrolix" with no "args" field instead.

[!TIP]

If the file already has other entries, add the "mcp-hydrolix" block inside the existing "mcpServers" object rather than replacing the whole file.

[!NOTE]

If you authenticate with a service account token instead of username/password, see Authentication.

Command not found?

Claude Desktop launches without your shell's PATH, so it may not locate the binary even if it is installed. Find the full path and use it as the "command" value in the config.

Option A (uv): find uvx:

macOS / Linux: which uvx
Windows: where.exe uvx

Option B (pip): find mcp-hydrolix:

macOS / Linux: which mcp-hydrolix
Windows: where.exe mcp-hydrolix

If which/where.exe returns nothing, the binary isn't on your PATH. The cleanest fix is to switch to Option A (uv), which manages the Python environment and PATH for you.

Step 4 — Restart Claude Desktop

Restart the app to apply the configuration.

macOS / Windows users: Make sure to fully quit Claude before restarting. On macOS, press Cmd+Q or right-click the Dock icon and choose Quit. On Windows, use the system tray icon.

Step 5 — Verify it's working

Open a new conversation in Claude Desktop. Look for a tools/hammer icon near the text input — this confirms the MCP server connected successfully.

Try this prompt to confirm everything is working:

Using your Hydrolix MCP tools, list the available databases.

Claude should call the list_databases tool and return a list of databases from your cluster.

Using Claude Code instead?

If you prefer the command line, make sure uv is installed (Option A from Step 2), then run:

claude mcp add --transport stdio hydrolix \

--env HYDROLIX_URL=https:// \ --env HYDROLIX_USER= \ --env HYDROLIX_PASSWORD= \ --env HYDROLIX_MCP_SERVER_TRANSPORT=stdio \ -- uvx --python 3.13 --refresh-package mcp-hydrolix mcp-hydrolix

Then open Claude Code and test with the same prompt:

Using your Hydrolix MCP tools, list the available databases.

Using VS Code instead?

Click the Install in VS Code badge at the top of this README for a one-click install. If you prefer the UI flow, open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P), run MCP: Add Server, choose Command (stdio), and reuse the uvx ... command and env block from Step 3.

Tools

run_select_query
Execute SQL queries on your Hydrolix cluster.
Input: query (string): The SQL query to execute.
Input: max_cells (integer, optional): Result cell budget (rows × columns); when the server sets a cap, a caller can only lower it.
Input: purpose (string, required): Why the query is being run; recorded with the query as hdx_query_comment.
A trailing FORMAT clause is removed; the server selects the wire format.

list_databases
List all databases on your Hydrolix cluster.

list_tables
List all tables in a database.
Input: database (string): The name of the database.

get_table_info
Get table metadata such as schema
Input: database (string): The name of the database.
Input: table (string): The name of the table.

Effective Usage

Due to the wide variety in LLM architectures, not all models will proactively use the tools above, and few will use them effectively without guidance, even with the carefully-constructed tool descriptions provided to the model. To get the best results out of your model while using the Hydrolix MCP server, we recommend the following:

Refer to your Hydrolix database by name and request tool usage in your prompts (e.g., "Using MCP tools to access my Hydrolix database, please ...")
This encourages the model to use the MCP tools available and minimizes hallucinations.
Include time ranges in your prompts (e.g., "Between December 5 2023 and January 18 2024, ...") and specifically request that the output be ordered by timestamp.
This prompts the model to write more efficient queries that take advantage of primary key optimizations

Health Check Endpoint

When running with HTTP or SSE transport, a health check endpoint is available at /health. This endpoint:

Returns 200 OK with the Hydrolix query-head's Clickhouse version if the server is healthy and can connect to Hydrolix
Returns 503 Service Unavailable if the server cannot connect to the Hydrolix query-head

Example:

curl http://localhost:8000/health

Response: OK - Connected to Hydrolix compatible with ClickHouse 24.3.1

Configuration

The Hydrolix MCP server is configured using a standard MCP server entry. Consult your client's documentation for specific instructions on where to find or declare MCP servers. An example setup using Claude Desktop is documented below.

The recommended way to launch the Hydrolix MCP server is via the uv project manager, which will manage installing all other dependencies in an isolated environment.

Authentication

The server supports multiple authentication methods with the following precedence (highest to lowest):

Per-request Bearer token: Service account token provided via Authorization: Bearer header
Per-request GET parameter: Service account token provided via ?token= query parameter
Environment-based credentials: Credentials configured via environment variables

Service account token (HYDROLIX_TOKEN), or
Username and password (HYDROLIX_USER and HYDROLIX_PASSWORD)

When multiple authentication methods are configured, the server will use the first available method in the precedence order above. Per-request authentication is only available when using HTTP or SSE transport modes. The ?token= form exists for clients that cannot send headers; set HYDROLIX_ALLOW_TOKEN_QUERY_PARAM=false on deployments where every client sends the Authorization header (see Per-request credentials).

Note: Using a service account token with a readonly role is recommended.

MCP Server definition using username and password (JSON):

"command": "uvx", "args": [ "--python", "3.13", "--refresh-package", "mcp-hydrolix", "mcp-hydrolix" ], "env": { "HYDROLIX_URL": "https:// ", "HYDROLIX_USER": " ", "HYDROLIX_PASSWORD": " " } }

MCP Server definition using service account token (JSON):

"command": "uvx", "args": [ "--python", "3.13", "--refresh-package", "mcp-hydrolix", "mcp-hydrolix" ], "env": { "HYDROLIX_URL": "https:// ", "HYDROLIX_TOKEN": " " } }

MCP Server definition using username and password (YAML):

command: uvx

args:

--python
"3.13"
--refresh-package
mcp-hydrolix
mcp-hydrolix

env: HYDROLIX_URL: https:// HYDROLIX_USER: HYDROLIX_PASSWORD:

MCP Server definition using service account token (YAML):

command: uvx

args:

--python
"3.13"
--refresh-package
mcp-hydrolix
mcp-hydrolix

env: HYDROLIX_URL: https:// HYDROLIX_TOKEN: <hydrolix-s

Only the beginning is shown; read the rest in the repo

MCP Hydrolix

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Happo

README from the maker

Hydrolix MCP Server

Quickstart

Step 1 — Prerequisites

Step 2 — Install the MCP server

Step 3 — Configure Claude Desktop

Step 4 — Restart Claude Desktop

Step 5 — Verify it's working

Using Claude Code instead?

Using VS Code instead?

Tools

Effective Usage

Health Check Endpoint

Response: OK - Connected to Hydrolix compatible with ClickHouse 24.3.1

Configuration

Authentication