cocanvas-beta.vercel.app WebMCP Tools, Schemas & Agent Capabilities

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cocanvas-beta.vercel.app

live Unverified (seed import) Productivity & Business 8 tools imperative implementation

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Write a brief. Share the board with an agent. Undo the bad draft. No upload, no account, no screenshot guessing.

First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com

Answer 3 · Act 5 · Transact 0 · Score: Not yet scored

Tool inspector

add_element

act imperative

Add one element. A finished board is a diagram: nodes (rectangle or ellipse) plus connect_elements. Facts go on nodes. Heading on line one, facts on the next line (WHO GETS IT then a newline then Plus. Pro. Business. Enterprise.). Do not drop kind text on arrows. Leave 32px between nodes. Title can be kind text. A hub ellipse is about 320 by 100. Do not stretch it across the child row. Score bars are charcoal rectangles, height 28. Never connect a bar, a score label, or a number. Always pass fill and stroke; omitted fill becomes a candy blue card. For text, fill is the ink color (#f4f4f5 on dark paper). ASCII labels only. Paper #0a0a0a. Keep x from 40 to 1400 and y from 24 to 1600.

Input schema

Property	Type	Required	Description
`kind`	string	yes	The type of element to add.
`x`	number	no	Left position in canvas pixels.
`y`	number	no	Top position in canvas pixels.
`width`	number	no	Width in pixels.
`height`	number	no	Height in pixels.
`text`	string	no	Text content (for text, sticky, frame title).
`fill`	string	no	Hex color. Required for a designed board. Text ink on dark paper: #f4f4f5. Rules: #2a2a2e. Bars: #2c2f36. Do not use candy blue or green.
`stroke`	string	no	Hex border. Match fill for rules and bars. Use transparent for text.
`fontSize`	number	no	Type size. Title 28, row 14, score 20, kicker 12.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "kind": {
      "type": "string",
      "enum": [
        "frame",
        "rectangle",
        "ellipse",
        "text",
        "sticky"
      ],
      "description": "The type of element to add."
    },
    "x": {
      "type": "number",
      "description": "Left position in canvas pixels."
    },
    "y": {
      "type": "number",
      "description": "Top position in canvas pixels."
    },
    "width": {
      "type": "number",
      "description": "Width in pixels."
    },
    "height": {
      "type": "number",
      "description": "Height in pixels."
    },
    "text": {
      "type": "string",
      "description": "Text content (for text, sticky, frame title)."
    },
    "fill": {
      "type": "string",
      "description": "Hex color. Required for a designed board. Text ink on dark paper: #f4f4f5. Rules: #2a2a2e. Bars: #2c2f36. Do not use candy blue or green."
    },
    "stroke": {
      "type": "string",
      "description": "Hex border. Match fill for rules and bars. Use transparent for text."
    },
    "fontSize": {
      "type": "number",
      "description": "Type size. Title 28, row 14, score 20, kicker 12."
    }
  },
  "required": [
    "kind"
  ],
  "additionalProperties": false
}

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