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

Tool inspector

undo_agent_step

act imperative

Undo your own most recent change(s) to the canvas. Use this when the human says that was wrong, or you realise you drew the wrong thing. This only reverses YOUR actions — it never touches what the human drew themselves. Example: {"steps":1}

Input schema

Property	Type	Required	Description
`steps`	integer	no	How many of your recent actions to reverse. Defaults to 1.

Raw JSON schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "steps": {
      "description": "How many of your recent actions to reverse. Defaults to 1.",
      "default": 1,
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 20
    }
  },
  "additionalProperties": false
}

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