web-mcp-extending-excalidraw.vercel.app WebMCP Tools, Schemas & Agent Capabilities

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web-mcp-extending-excalidraw.vercel.app

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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

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act imperative

Add a callout note pointing at a specific element: a short piece of text placed beside it, with an arrow linking the two. Use this to draw attention to something — the tallest bar in a chart, the bottleneck in a flowchart, the cell with the best result. Get the target id from draw_chart's "points", draw_table's "cells", a draw_* tool's "nodeIds", get_selection, or find_elements. Example: {"targetId":"abc123","text":"biggest jump","side":"top","color":"#e03131"}

Input schema

Property	Type	Required	Description
`targetId`	string	yes	The element the note points at.
`text`	string	yes	Keep it short — a phrase, not a paragraph.
`side`	string	no	Which side of the target to put the note on.
`color`	string	no	Hex colour for the note and arrow, e.g. "#e03131".

Raw JSON schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "targetId": {
      "description": "The element the note points at.",
      "type": "string"
    },
    "text": {
      "description": "Keep it short — a phrase, not a paragraph.",
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "side": {
      "description": "Which side of the target to put the note on.",
      "default": "top",
      "type": "string",
      "enum": [
        "top",
        "right",
        "bottom",
        "left"
      ]
    },
    "color": {
      "description": "Hex colour for the note and arrow, e.g. \"#e03131\".",
      "type": "string"
    }
  },
  "required": [
    "targetId",
    "text"
  ],
  "additionalProperties": false
}

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