sharableworlds.com
An open dotted canvas built by a human and a WebMCP agent together. The agent reads the map and fills empty lots; the human paints and locks their own.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 9 · Act 24 · Transact 0 · Score: Not yet scored
Tool inspector
place_piece
PRIMITIVE — ONE object. Use for a single targeted addition ('a tree beside the house': relative_to the house id, side), a unique landmark, or a correction after validate_scene. NEVER build a scene or a group with repeated calls: plan_scene → compose_scene → populate_zones builds worlds; create_vegetation plants groups; place_batch places an explicit list in one call. Pass id (catalog id, preferred — e.g. market-display-fruit, pirate-ship-pirate-large, pets-animal-cat, food-burger-cheese, furniture-lounge-sofa, nature-tree-oak, coaster-station, toycar-vehicle-racer, space-room-large) or kind. Target lot (A1-style) OR relative_to (piece id) + side (north|south|east|west) + gap (1-4); with no target the page grows the scene. rot (0|90|180|270: 0 faces camera-south, 90 west, 180 north, 270 east) sets facing. Refuses occupied, off-scene, stair, walkway (bulky pieces), and human-locked lots; a collision nudges at most 2 cells and the record says so (requested_lot, drift). Returns the placement record and the map. Lots are A1-style ids (M13 is the home center); there are no x,y. Never target human_locks. Every write returns the placement record (lot, requested_lot, drift, zone, level, surface, facing) — read it. Pass intent (a short phrase) so the canvas can narrate.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
id |
string | no | Any catalog id from list_catalog, e.g. pirate-ship-pirate-large or furniture-lounge-sofa. |
kind |
string | no | Fallback when no id: stall|prop|character|tree|crate|machine|ramp|dungeon|boat|pirate|car|pet|food|furniture|building|cave|space|nature|coaster. |
intent |
string | no | Short phrase shown live on the canvas, e.g. 'docking the pirate ship'. |
lot |
string | no | Lot id like C4. Omit to place relative or auto. |
relative_to |
string | no | Existing piece id, e.g. pirate-barrel-1. |
side |
string | no | — |
gap |
number | no | Cells away from relative_to, 1-4. Default 1. |
flip |
boolean | no | Mirror horizontally. |
rot |
number | no | Facing: 0|90|180|270. |
reason |
string | no | Story reason ('the centerpiece', 'out over the water') for the narrator. |
Raw JSON schema
{
"type": "object",
"properties": {
"id": {
"type": "string",
"description": "Any catalog id from list_catalog, e.g. pirate-ship-pirate-large or furniture-lounge-sofa."
},
"kind": {
"type": "string",
"description": "Fallback when no id: stall|prop|character|tree|crate|machine|ramp|dungeon|boat|pirate|car|pet|food|furniture|building|cave|space|nature|coaster."
},
"intent": {
"type": "string",
"description": "Short phrase shown live on the canvas, e.g. 'docking the pirate ship'."
},
"lot": {
"type": "string",
"description": "Lot id like C4. Omit to place relative or auto."
},
"relative_to": {
"type": "string",
"description": "Existing piece id, e.g. pirate-barrel-1."
},
"side": {
"type": "string",
"enum": [
"north",
"south",
"east",
"west"
]
},
"gap": {
"type": "number",
"description": "Cells away from relative_to, 1-4. Default 1."
},
"flip": {
"type": "boolean",
"description": "Mirror horizontally."
},
"rot": {
"type": "number",
"description": "Facing: 0|90|180|270."
},
"reason": {
"type": "string",
"description": "Story reason ('the centerpiece', 'out over the water') for the narrator."
}
}
}
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