web-mcp-extending-excalidraw.vercel.app
A whiteboard that gets better when a human and an agent draw on it together.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 4 · Act 21 · Transact 0 · Score: Not yet scored
Tool inspector
draw_graph
Draw a relationship graph — things connected to each other in no particular hierarchy. Use this for characters in a novel, concepts in a literature review, components in a system, or citations between works. Use "group" on nodes to cluster related items; each group is drawn as a labelled box around its members. Edges are undirected by default; set "directed": true for an arrow. Keep it under 40 nodes. If the structure is a strict tree, draw_hierarchy gives a cleaner result. Example: {"nodes":[{"id":"anna","label":"Anna","group":"Family"},{"id":"pyotr","label":"Pyotr","group":"Family"},{"id":"vronsky","label":"Vronsky"}],"edges":[{"from":"anna","to":"pyotr","label":"married to"},{"from":"anna","to":"vronsky","label":"affair","directed":true}]}
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
title |
string | no | — |
nodes |
array | yes | — |
edges |
array | no | — |
direction |
string | no | — |
placement |
— | no | Where to put it. Omit for the centre of the human's current view. {"mode":"next_to","refId":"<id>","side":"right"} places it beside an existing element; {"mode":"free_space"} puts it clear of everything already drawn. |
Raw JSON schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"properties": {
"title": {
"type": "string"
},
"nodes": {
"minItems": 1,
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {
"type": "string"
},
"label": {
"type": "string"
},
"group": {
"description": "Nodes sharing a group are drawn inside a labelled cluster.",
"type": "string"
}
},
"required": [
"id",
"label"
]
}
},
"edges": {
"default": [],
"type": "array",
"items": {
"type": "object",
"properties": {
"from": {
"type": "string"
},
"to": {
"type": "string"
},
"label": {
"type": "string"
},
"directed": {
"default": false,
"type": "boolean"
}
},
"required": [
"from",
"to"
]
}
},
"direction": {
"default": "LR",
"type": "string",
"enum": [
"TD",
"LR"
]
},
"placement": {
"description": "Where to put it. Omit for the centre of the human's current view. {\"mode\":\"next_to\",\"refId\":\"<id>\",\"side\":\"right\"} places it beside an existing element; {\"mode\":\"free_space\"} puts it clear of everything already drawn.",
"anyOf": [
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"const": "viewport"
}
},
"required": [
"mode"
]
},
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"const": "next_to"
},
"refId": {
"type": "string"
},
"side": {
"type": "string",
"enum": [
"right",
"below",
"left",
"above"
]
},
"gap": {
"type": "number"
}
},
"required": [
"mode",
"refId"
]
},
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"const": "free_space"
}
},
"required": [
"mode"
]
},
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"const": "absolute"
},
"x": {
"type": "number"
},
"y": {
"type": "number"
}
},
"required": [
"mode",
"x",
"y"
]
}
]
}
},
"required": [
"nodes"
],
"additionalProperties": false
}
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