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Hydroxyl MCP Server

local only

Hydroxyl runs on your own machine — the client starts it, so there is no endpoint to ping. 42 installs a week from npm. Last commit 19 Oct 2026.

Local stdio MCP server: publication figures, structure checks and conversions for AI assistants

Installs per day peak 347 · avg 11
a month agotoday
42
Installs / week
npm · hydroxyl-mcp
0
Stars
0 open issues
19 Oct 2026
Last commit
2 releases in 90 days
MIT
License
TypeScript

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

      "eNq1vHdAVMcTOL67790dINLhQDonYC8cRexYUQEBkSIWUFBQmmABFRFRQRQrdsSuqFiDNXbskmhioom9phijxJjE4N3ed3bfUUzy+f2+vz9+HPN23+zu7Ozs7OxsuUMYIWSK5iABZQzs138AeScGA0YD0G9g6NBhQacW/4oQ7o2Qge3AYcP72I43X4KQYTSkHx46rKNX9rs2iQgZGcN73LCIgIgf027Yw3sKvAeOS43P2HZ6QCG8VyFEzCbEZ2UA3gwh44sQGkxIyRl/1…
Builds a file path from a variable packages/client/next.config.ts:57
  if (!names.every((name) => existsSync(path.join(root, name)))) return "";
      "eNq1vHdAVMcTOL67790dINLhQDonYC8cRexYUQEBkSIWUFBQmmABFRFRQRQrdsSuqFiDNXbskmhioom9phijxJjE4N3ed3bfUUzy+f2+vz9+HPN23+zu7Ozs7OxsuUMYIWSK5iABZQzs138AeScGA0YD0G9g6NBhQacW/4oQ7o2Qge3AYcP72I43X4KQYTSkHx46rKNX9rs2iQgZGcN73LCIgIgf027Yw3sKvAeOS43P2HZ6QCG8VyFEzCbEZ2UA3gwh44sQGkxIyRl/1…

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add hydroxyl -- npx -y hydroxyl-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "hydroxyl": {
      "command": "npx",
      "args": [
        "-y",
        "hydroxyl-mcp"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.hydroxyl]
command = "npx"
args = ["-y", "hydroxyl-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "hydroxyl": {
      "command": "npx",
      "args": [
        "-y",
        "hydroxyl-mcp"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "hydroxyl": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "hydroxyl-mcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: HYDROXYL_EDITOR_URL (Editor that editor_link points at (default https://hydroxyl.app/editor/)).

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Hydroxyl — questions

Answers built from our own checks of this server.

Why is there no uptime for Hydroxyl?
Hydroxyl runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package hydroxyl-mcp was installed 42 times last week.
How do I connect Hydroxyl?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls hydroxyl-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use Hydroxyl?
The npm package hydroxyl-mcp was installed 42 times in the last week. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Hydroxyl open source?
Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.