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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_flowchart

act imperative

Draw a proper flowchart with automatic layout. Use this — not add_elements — whenever the user describes a process, algorithm, decision tree, pipeline, or any set of steps connected by arrows. Layout, spacing and arrow routing are handled for you. Give either "nodes" + "edges" (preferred — you do not have to know Mermaid) or a raw "mermaid" string. Use shape "diamond" for decision points. Keep it under 40 nodes; for anything bigger, split it into a draw_board with several panels. Example: {"nodes":[{"id":"s","label":"Submit","shape":"stadium"},{"id":"d","label":"Approved?","shape":"diamond"},{"id":"p","label":"Publish"}],"edges":[{"from":"s","to":"d"},{"from":"d","to":"p","label":"yes"}],"direction":"LR"}

Input schema

Property	Type	Required	Description
`nodes`	array	no	—
`edges`	array	no	—
`direction`	string	no	TD = top-down (default), LR = left-to-right. Use LR for pipelines.
`mermaid`	string	no	Raw Mermaid, e.g. "flowchart LR\n A[One] --> B[Two]". Only use if you specifically need Mermaid syntax.
`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": {
    "nodes": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "description": "Short identifier you will use in edges, e.g. \"start\".",
            "type": "string"
          },
          "label": {
            "description": "Text shown in the box. Keep it under about six words.",
            "type": "string"
          },
          "shape": {
            "description": "Use \"diamond\" for decisions and \"stadium\" for start/end. Defaults to rectangle.",
            "type": "string",
            "enum": [
              "rectangle",
              "diamond",
              "round",
              "stadium",
              "circle"
            ]
          }
        },
        "required": [
          "id",
          "label"
        ]
      }
    },
    "edges": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "from": {
            "type": "string"
          },
          "to": {
            "type": "string"
          },
          "label": {
            "description": "Text on the arrow, e.g. \"yes\" / \"no\".",
            "type": "string"
          }
        },
        "required": [
          "from",
          "to"
        ]
      }
    },
    "direction": {
      "description": "TD = top-down (default), LR = left-to-right. Use LR for pipelines.",
      "default": "TD",
      "type": "string",
      "enum": [
        "TD",
        "LR",
        "BT",
        "RL"
      ]
    },
    "mermaid": {
      "description": "Raw Mermaid, e.g. \"flowchart LR\\n A[One] --> B[Two]\". Only use if you specifically need Mermaid syntax.",
      "type": "string"
    },
    "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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