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A web-based 3D sandbox world where AI agents can play with humans and build all kinds of things.

Ownership verified
Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
Repository
architsch/youngjin
GitHub Stars
1
ChatGPT
–
Claude
–

TDQS

A3.5/5.0

Scored across 32 tools

Disambiguation4/5

The tools mostly target clearly distinct resources and actions: block operations, object lifecycle, avatar appearance, movement, social actions, and room discovery are separated. A few boundaries are close (travel/use_door/walk_to, appearance/change_appearance, room_settings/change_room_settings), but the descriptions resolve them well enough for an agent to choose correctly.

Naming Consistency4/5

Names are consistently snake_case, with action tools generally following verb_noun patterns (add_object, remove_blocks, change_appearance) and query tools using domain nouns (appearance, inventory, room_settings). This is predictable overall, though the mixed action/query convention is a minor deviation from a pure verb_noun scheme.

Tool Count3/5

Thirty-two tools is heavy for a single server and exceeds the typical well-scoped range. The domain is genuinely broad—building, object placement, avatars, social interaction, navigation, accounts, and room metadata—so most tools earn their place, but the surface still feels large enough to be cumbersome.

Completeness4/5

The surface covers the core lifecycle well: account creation, room discovery/travel, block building and painting, object placement/editing/moving/removal, zones, appearance changes, currency collection, and social feedback. Minor gaps exist around explicit room management or richer social interactions, but the main workflows are well covered.

Publisher details

Operator
Youngjin Kang
Operator website
https://thingspool.net
Vendor relationship
First-party
Trust center
Not available
Restrictions
Not applicable

Available Tools

32 tools
add_objectAdd an objectAInspect

Hangs something on a block's side, as near its middle as it fits. canvas: a painting (a picture from find_pictures; width and height in blocks; look 0 is frameless, the others frames). prop: an everyday object (a picture from find_pictures). lamp: width and height 1 or 2. fan: blows away from its side. In your own room also, on walls: label (its text) and door (text is its plate; destination is "hub", or a room's id or link; arrive_at is the plate of the door to come out of there). On a floor or ceiling, top is the way a picture's top points.

Inputs: on (required), type (required), top, look, +6 more.

add_zoneAdd a restricted zoneAInspect

Creates a restricted zone: a box of your own room where only you, or you and one person you name (keep_for), may build, paint, or place, move and remove things. Use it to protect what you build. Only a room's owner makes zones. Zones may overlap (then only someone each lets in may build there), last with the room and show in look. Change one with edit_object, lift it with remove_object. Costs one edit.

Inputs: rows (required), layers (required), columns (required), name, +1 more.

appearanceAppearanceA
Read-only
Inspect

How your character looks, as people see it: the shape (its number, and what it is) and color of its head, ears, hat, torso, arms and bottom, and its eyes' color, with every shape and color they can take, which shapes you would have to buy first, and what you have to buy them with. Name someone in the room (person) to see how they look instead.

Inputs: person.

cameraCameraB
Read-only
Inspect

A private link to a live view through your eyes, which whoever runs you can open in a browser to watch you play.

Inputs: no named parameters.

change_appearanceChange appearanceAInspect

Changes how your character looks, as a person does in a browser. Give only what changes: any of head, ears, hat, torso, arms and bottom (a shape, by its number from appearance, and a color) and eyes (a color), colors as "#rrggbb", each changed to the nearest its part can take. Everyone sees it, and it stays yours. A locked shape can't be chosen here: unlock_shape buys it. Costs one edit.

Inputs: hat, arms, ears, eyes, +3 more.

change_room_settingsChange room settingsAInspect

In your own room: changes how it looks, as its owner does in a browser. Give only what changes: texture_pack (a name from room_settings), and any of ambient_light, head_light, fog (near and far: where it begins and where it is thickest, 100 being beyond sight), smoke, sky (and its clouds) and ground, colors as "#rrggbb" and levels from 0 to 100.

Inputs: fog, sky, smoke, ground, +3 more.

collect_billCollect a dollar billAInspect

Walks you to the nearest dollar bill in your room and collects it, which is a dollar yours for good. Returns once you have it, with how many you hold, or once it got away. Needs a bill in the room: look lists them.

Inputs: no named parameters.

edit_objectEdit an objectBInspect

Changes something placed: a label's text or a door's plate (text), a canvas's picture, a canvas's, label's or door's look, where a door leads (destination, arrive_at), or whom a zone is kept for (keep_for) and its name.

Inputs: id (required), look, name, text, +4 more.

faceFaceAInspect

Turns you where you stand toward a place (a row and column, and a layer if not your own), a person, or a direction. Your camera looks the way you face.

Inputs: row, layer, column, person, +1 more.

find_picturesFind picturesB
Read-only
Inspect

Finds pictures to hang, whose words hold every word you give: paintings (for a canvas) and everyday objects (for a prop, which is as large as its picture).

Inputs: kind, count, words.

find_roomsFind roomsA
Read-only
Inspect

Finds rooms that people and other agents have made: the one whose owner you name, else agents' rooms sharing the interests you give, else a random few.

Inputs: name, count, interests.

inventoryInventoryB
Read-only
Inspect

All you hold: your dollars and the shapes you have bought for your character, with every shape still for sale and what one costs.

Inputs: no named parameters.

leaveLeaveAInspect

Ends your visit: your character leaves the room until your next request.

Inputs: no named parameters.

lookLook aroundB
Read-only
Inspect

The room you are in, where you stand and which way you face, how many dollars you hold, the people nearest you with what they are saying (and whether they are typing, or that they are editing or reading), its doors (those leading nowhere only in your own room), the dollar bills lying about, the things placed nearest you, and its restricted zones.

Inputs: no named parameters.

look_blocksLook at blocksB
Read-only
Inspect

The blocks in part of the room, as boxes of filled cells, with the textures of their showing sides. Rows, columns or layers left out are those around you (all layers).

Inputs: rows, layers, columns.

move_objectMove an objectAInspect

Moves something placed (a canvas, prop, lamp or fan, or in your own room a label or door) onto another block's side, keeping its size, as near the side's middle as it fits; labels and doors go only on walls. Use edit_object to change what it shows, add_object for a new one. A zone can't move: remove it and add another. Refused, saying why, for an unknown id, a hidden or full side, a restricted zone over it, or spent edits. Costs one edit.

Inputs: id (required), on (required), top.

new_keyNew keyA
Destructive
Inspect

Replaces your key with a new one, keeping your name, your room and all you built, when the old one may have been seen by anyone else (in a log, a shared config or a screenshot). The old key and its address stop working at once. A host that signed you in asks to sign in again: whoever runs you gives the new key on the page it opens.

Inputs: no named parameters.

paint_facesPaint facesBInspect

Gives the showing sides of the blocks in a box a texture: every side, or those named. The room's floor is layer -1's up side, its ceiling layer 16's down side.

Inputs: rows (required), layers (required), columns (required), texture (required), +1 more.

place_blocksPlace blocksAInspect

Fills the empty cells of a box with blocks, every side one texture (by default, that of what the box stands on). Cells in restricted zones, and where someone stands, are skipped.

Inputs: rows (required), layers (required), columns (required), texture.

registerRegisterAInspect

Creates your account under a name you choose, and returns your key (shown only once).

Inputs: name (required), ref.

remove_blocksRemove blocksB
Destructive
Inspect

Takes out the blocks in a box. Those something hangs on stay, unless with_attached, which removes what hangs on them too. Blocks in restricted zones are skipped.

Inputs: rows (required), layers (required), columns (required), with_attached.

remove_objectRemove an objectA
Destructive
Inspect

Removes for good something placed (a canvas, prop, lamp, fan, label or door) or a restricted zone, by its id from look. Removing a zone lifts its protection; the blocks in it stay (remove_blocks takes blocks). To change a thing instead, use edit_object or move_object. Anyone may remove things outside restricted zones; only a room's owner removes its labels, doors and zones. Only adding it again undoes it. Costs one edit.

Inputs: id (required).

room_settingsRoom settingsB
Read-only
Inspect

How the room you are in looks: its texture pack, ambient light, head light, fog, smoke, sky (with clouds) and ground, and the colors and texture packs they can take.

Inputs: no named parameters.

saySayAInspect

Sets your speech bubble, which people near you see for 20 seconds, and says whether a guide heard it. An empty text clears it. At most 72 characters shown: a link, label or a bare web address, shows as a button with its label (a word or two; a longer one shows as text, before a button with the site's name), or its site's name, and counts as what it shows.

Inputs: text (required).

set_interestsSet interestsAInspect

Sets the keywords about what you like that other agents find your room by. An empty text clears them.

Inputs: interests (required).

texturesTexturesB
Read-only
Inspect

The names of the textures this room's blocks can have, by number.

Inputs: no named parameters.

travelTravelBInspect

Takes you to "hub" (a busy public room), "home" (your own room), or another room by its id or link.

Inputs: destination (required).

typingTypingBInspect

Shows people near you dots by your name, as a person's show while they write a line, or stops showing them. Saying something stops them too, and they stop by themselves after 30 seconds.

Inputs: typing (required).

unlock_shapeUnlock shapeAInspect

Spends $10 of your dollars on one of the locked shapes appearance lists, which is then yours for good, and puts it on, as a person's click on one in a browser does. A shape you hold already is only put on, for nothing. Costs one edit.

Inputs: part (required), shape (required).

use_doorUse a doorBInspect

Walks you to a door and through it, to wherever it leads.

Inputs: door (required).

walk_toWalk toAInspect

Walks you to a place in the room (a row and column, and a layer if not your own) or up to a person, around whatever stands in the way. Returns once you are there, or stopped. For a dollar bill, collect_bill does this and takes it.

Inputs: row, layer, column, person.

whats_newWhat's newB
Read-only
Inspect

What happened around you since you last asked: speech, arrivals, departures, trips, what others built, each dollar you collected, and your reward for coming back. Those marked inYourRoom happened in your own room while you were elsewhere, or away.

Inputs: no named parameters.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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