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HYRR MCP Server

local only

HYRR runs on your own machine — the client starts it, so there is no endpoint to ping. 251 installs a week from pypi. Last commit 28 Sep 2026.

Radio-isotope production, activity and dose for charged-particle beams on stacked targets

Installs per day peak 206 · avg 60 · -37% w/w
a month agotoday
251
Installs / week
pypi · hyrr-mcp
0
Stars
56 open issues
28 Sep 2026
Last commit
from GitHub
MIT
License
Rust

What the code does

We read the source, 2 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.

File ships in the package but is absent from the source [пакет] nucl-parquet/clients/rs/nucl-parquet/src/data_dir.rs:1, [пакет] nucl-parquet/clients/rs/nucl-parquet/src/electron.rs:1, [пакет] nucl-parquet/clients/rs/nucl-parquet/src/error.rs:1 и ещё 12
этот файл ставится пользователю, но в репозитории его нет
Page loads a third-party script frontend/index.html:49, landing/index.html:179
    <script src="https://challenges.cloudflare.com/turnstile/v0/api.js?render=explicit" async defer></script>
      "image/png": "iVBORw0KGgoAAAANSUhEUgAAA9wAAAJOCAYAAABFiQ/hAAAAOnRFWHRTb2Z0d2FyZQBNYXRwbG90bGliIHZlcnNpb24zLjEwLjgsIGh0dHBzOi8vbWF0cGxvdGxpYi5vcmcvwVt1zgAAAAlwSFlzAAAPYQAAD2EBqD+naQAAry1JREFUeJzs3Qd0VFXXxvEnvZBGAilA6L33joCgNBtiBRW7qFiw66eovHZfXxXBXrChoKIgCopI77333kJCSyU93zon…
In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

Asks for container control access .devcontainer/docker-compose.yml:10
      - "${CONTAINER_SOCKET_PATH:-/var/run/docker.sock}:/var/run/docker.sock"

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 hyrr -- uvx hyrr-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "hyrr": {
      "command": "uvx",
      "args": [
        "hyrr-mcp"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.hyrr]
command = "uvx"
args = ["hyrr-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "hyrr": {
      "command": "uvx",
      "args": [
        "hyrr-mcp"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "hyrr": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "hyrr-mcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: HYRR_DATA (nucl-parquet data directory. Unset: the matching data release is fetched once into ~/.hyrr/nucl-parquet), HYRR_LIBRARY (Nuclear data library id, e.g. tendl-2023-iso (default) or endfb-8.1).

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HYRR — questions

Answers built from our own checks of this server.

Why is there no uptime for HYRR?
HYRR 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 pypi package hyrr-mcp was installed 251 times last week.
How do I connect HYRR?
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 hyrr-mcp straight from pypi; nothing to host, nothing to sign up for.
How many people use HYRR?
The pypi package hyrr-mcp was installed 251 times in the last week. Week over week that is -37%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is HYRR open source?
Yes — it is published under the MIT licence, written in Rust, 0 stars on GitHub and 56 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.