Zinfo

What is this?
Zinfo is a Paper admin tool in two layers.
First: see what is loading the server. A click GUI (or console text) shows online players, flying players, mobs, item frames, armor stands, experience orbs, total entities and loaded chunks. Per world breakdown, top hotspots, teleport to those spots, teleport to flying players, and remove junk in a radius around you.
Second: automatic protection. Per chunk caps for frames, armor stands, minecarts and boats (extra entities get removed). Command blocks are stripped from chunks. Redstone mechanism blocks can be blocked when a chunk is already full. Large underwater soul sand / magma platforms that make bubble columns for lag can be cleaned on a timer. Small lifts (1x1, 2x2) stay.
One jar, one config.yml. Defaults already whitelist lobby and spawn so creative hubs are not hit by the limits.
Where it runs

• Yes: Paper 1.21.11 (pom targets paper api 1.21.11). Java 21 or newer.
• Usually fine: Purpur on the same game version.
• No: plain Spigot or CraftBukkit.
• No: Folia.
• Note: this build is for Paper 1.21.11, not Paper 26.1.x. If you already moved to 26.1.x, ask before assuming the jar works unchanged.

Built with Kotlin. The kotlin stdlib is shaded into the jar so you do not install anything else.
GUI (/zinfo for players)
Opens the main panel with live totals. From there:

• Worlds pick a world, see mobs / frames / stands / XP / chunks / entities for that world
• Entity hotspots choose type (mobs, frames, armor stands, XP orbs, command blocks), then teleport to the densest loaded chunk spots (index 0 = worst)
• Flying players list who is flying, click or use /zinfo tpfly to go to them
• Mechanisms top loaded chunks by redstone style blocks (pistons, repeaters, comparators, dispensers, droppers, observers, hoppers by default). Useful to find crash machines. Teleport with permission zinfo.tp
• Remove pick type, pick radius (10 / 30 / 100 / 1000 / 5000), confirm. Needs zinfo.remove. Large command block radii only scan loaded chunks so the main thread does not freeze
• Refresh / reload refresh the panel, or reload config.yml and restart periodic tasks (zinfo.reload)

Console has no inventory GUI: /zinfo prints the full text summary. /zinfo <world> prints one world.
Commands
Aliases: /zinfo, /zi, /serverinfo
Notes:

• Default remove radius is 16 if you use the command without a number
• commandblocks and mechanisms tops sample a limited set of loaded chunks (not a full world scan) on purpose
• Removing frames does not drop the item or map inside them

Automatic chunk limits (config.yml)
Each limit has enabled, max (where relevant), remove newest first (for entities), and world whitelist = worlds where the rule does NOT run.

• frames per chunk item frame + glow item frame. Default max 25
• armor stands per chunk default max 15. Optional no gravity on player placed stands
• minecarts per chunk all minecart types. Default max 5
• boats per chunk default max 5
• command blocks per chunk on place, next tick clears command / chain / repeating command blocks in that chunk. Optional scan of loaded chunks on a timer (default every 10 seconds, a few chunks per pass) to catch datapack / structure leftovers
• redstone per chunk placing listed mechanism blocks is cancelled when the chunk is already over max (default 50). Block list is editable in config
• underwater bubble platforms removes soul sand and/or magma under water only when they form a platform of min size 3x3 or larger. Interval and chunks per run are tunable
• item frame fixed optional: mark frames fixed so they update less (off by default)

Permissions
How to install

1. Put Zinfo.jar into the plugins folder
2. Start Paper once so config.yml appears
3. Edit limits, world whitelist (lobby / spawn by default), redstone block list and task intervals
4. Use /zinfo reload after edits (or restart)

Config
Single file: plugins/Zinfo/config.yml
All messages in the plugin use classic & color codes in the GUI and chat feedback.
Support
Telegram: https://t.me/Zoobastiks
If something breaks, tell me your Paper version, Java version, and the error from the console. That saves a lot of back and forth.
Thanks for trying Zinfo.