BeaconHUD

Aim the crosshair at a beacon no more than 8 blocks away and a small panel opens in the upper-left corner of the screen. The panel shows the completed pyramid tier from 1 to 4, the effect radius in blocks, and the primary and secondary effects that are set. A tier 0 reading means the base pyramid is not finished yet. The radius is computed as tier times 10 plus 10, so tier 1 reaches 20 blocks and tier 4 reaches 50 blocks. The tier is calculated live from the blocks beneath the beacon.

The panel is drawn through Fabric's HUD render callback, and it is hidden together with the rest of the interface when F1 is pressed. The HUD toggle with V is off by default and is read from a raw GLFW key poll, so the key works the same on every supported version without a rebind. The mod opens no beacon screen, changes no block and sends no network packet, which means a player reads the beacon without touching the GUI. Installation needs Fabric API. BeaconHUD is client-side only, so a server can run without it and players are the only ones who install it. Files exist for 1.21.8, 1.21.9, 1.21.10 and 1.21.11 under the MIT License, which is not open source.