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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place_image

act imperative

Put an image on the canvas. Use "upload" to ask the human to pick a file, or "dataURL" if you already have the image bytes. The common use is tracing: place a photo of a hand-drawn sketch faded in the background, then redraw it cleanly beside it with draw_flowchart or add_elements. Default opacity is 40 for exactly that. Note: you cannot see the image this returns. Read the picture from the user's chat attachment and use this tool only to put a reference copy on the canvas. Example: {"source":"upload","opacity":40}

Input schema

Property	Type	Required	Description
`source`	string	no	"upload" opens a file chooser, "camera" opens the webcam, "dataURL" uses the string you pass.
`dataURL`	string	no	Required when source is "dataURL". Must start with "data:image/".
`opacity`	number	no	40 makes it a faint tracing reference. Use 100 for a normal image.
`maxWidth`	number	no	Longest edge in canvas units; aspect ratio is preserved.
`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": {
    "source": {
      "description": "\"upload\" opens a file chooser, \"camera\" opens the webcam, \"dataURL\" uses the string you pass.",
      "default": "upload",
      "type": "string",
      "enum": [
        "upload",
        "camera",
        "dataURL"
      ]
    },
    "dataURL": {
      "description": "Required when source is \"dataURL\". Must start with \"data:image/\".",
      "type": "string"
    },
    "opacity": {
      "description": "40 makes it a faint tracing reference. Use 100 for a normal image.",
      "default": 40,
      "type": "number",
      "minimum": 0,
      "maximum": 100
    },
    "maxWidth": {
      "description": "Longest edge in canvas units; aspect ratio is preserved.",
      "default": 600,
      "type": "number",
      "minimum": 50,
      "maximum": 2000
    },
    "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"
          ]
        }
      ]
    }
  },
  "additionalProperties": false
}

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