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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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draw_timeline

act imperative

Draw an ordered sequence of events along an axis: plot events, experiment stages, project milestones, historical background. Labels alternate above and below the line so they do not collide. Use this when order matters but there is no branching. If steps branch or loop, use draw_flowchart. Example: {"title":"Study timeline","events":[{"label":"Recruit","detail":"n=120"},{"label":"Baseline"},{"label":"Follow-up","detail":"12 weeks"}],"orientation":"horizontal"}

Input schema

Property	Type	Required	Description
`title`	string	no	—
`events`	array	yes	—
`orientation`	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"
    },
    "events": {
      "minItems": 2,
      "maxItems": 40,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "label": {
            "description": "Short name for the event.",
            "type": "string"
          },
          "detail": {
            "description": "Secondary line — dates, counts, notes. Put detail HERE, not in the label.",
            "type": "string"
          }
        },
        "required": [
          "label"
        ]
      }
    },
    "orientation": {
      "default": "horizontal",
      "type": "string",
      "enum": [
        "horizontal",
        "vertical"
      ]
    },
    "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": [
    "events"
  ],
  "additionalProperties": false
}

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