under-management

under-management gives you a game for Claude’s long turns. After 20 seconds of work, a one-line strip above the prompt offers it. Press 1 and Under Management, a dungeon-management game, opens in a 960 x 600 window of its own beside Claude Code. When Claude finishes, the game pauses itself and tells you. The mod never calls the model, so it costs no tokens.

What it does

Under Management is a 3D isometric game from the same author. You run a house: dig it out, build rooms and hire staff to run it, while adventurers from the Guild come for the gold. You give no unit orders, so the layout of the house is your defence. The mod opens the companion edition, with four houses: Marrow’s Rest, Ashfell, Penhallow and Undercliff. You can try that edition in a browser before installing, at under-management.vercel.app/companion.

The game pauses when Claude’s turn ends and also whenever its window loses focus, so nothing happens in the house while you read the answer. Your saves carry over between sessions.

• /under-management opens the game now, without waiting for the strip.
• /under-management delay <s> sets the seconds of work before the offer: 20 by default, from 5 to 600.
• /under-management auto on opens the window on its own after the delay instead of showing the strip. Off by default.
• /under-management strip off hides the strip. The command above still opens the game.
• /under-management help lists the commands and your current settings.

Settings are saved and apply to every session.

Install

Needs Claude Code 2.1.287 or later in a local session, an internet connection and a web browser. Chrome or Edge give the game an app window of its own; without them it opens in your default browser.

claude plugin marketplace add Interesting-Systems/under-management-claude
claude plugin install under-management@interesting-systems

The next time Claude works for more than 20 seconds, the strip appears: press 1. To open the game right away, run /under-management.

How it works

The mod only draws the strip. The game is not in the plugin: it is a web page on the author’s site, under-management.vercel.app, and its source is not in the repository. Pressing 1 starts a browser in app mode with a profile of its own (~/.under-management/window, or %LOCALAPPDATA%\UnderManagement\window on Windows), which is where the saves live. On macOS it tries Chrome, Edge, Brave and Chromium; on Windows, Edge; on Linux, the first Chromium-family browser on the PATH. If none opens, it falls back to the default browser.

To tell the window when Claude is done, the mod posts to a relay on the same site, https://under-management.vercel.app/api/companion:

• Nothing at all until you open the game window in a session. If you never press 1, the mod makes no request.
• Once the window is open, two posts per turn: working with the time the turn started, then ready with how long it took. They go under a random 16-character code made for the session, which is the only key to that record.
• Never your prompt, Claude’s answer or any file name. The mod does not read them. The author says the server keeps no IP addresses.

The game page also sends data of its own, as the public web version does: an anonymous log of the commands you give in the game, on by default. You can switch it off from the Esc menu. The mod’s settings stay in Claude Code’s plugin store on your machine.

Limitations

• Tested live on macOS only. The Windows and Linux launchers are written and unit-tested, but the author has not tried them on those systems yet.
• A cloud session cannot open a window on your machine, and in claude -p runs the mod does nothing.
• The game depends on the author’s site. If the relay cannot be reached, the window never hears that Claude finished and does not pause on its own.
• The companion edition stops at Undercliff. The author will add the other houses if about fifty people ask, with a thumbs-up on the pinned “More houses?” issue or the button of the same name in the game.