computer.webmcp.com WebMCP Tools, Schemas & Agent Capabilities

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computer.webmcp.com

demo Unverified (seed import) AI & Agents 30 tools imperative implementation

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WebMCP Computer — one browser machine shared by a human and an agent.

First seen 2026-09-07 · Last seen 2026-09-14 · Source: webmcp.com

Answer 11 · Act 17 · Transact 2 · Score: Not yet scored

Tool inspector

ui_open

act imperative

Create or open an agent-made HTML app in a visible WebMCP Computer window. Pass exactly one of html or an existing ~-rooted .html path; inline HTML is written to ~/apps/ .html and remains live-editable by the human. The app runs in an opaque allow-scripts sandbox with no same-origin or popup access. Its HTML may publish site_* WebMCP tools through document.modelContext. allowTools defaults to an empty inward grant and may expose active non-transact OS tools; transact tools, site_* tools, unknown tools, and ui_open are always excluded. Returns PID, file path, applied rect, and the granted tool names.

Input schema

Property	Type	Required	Description
`name`	string	yes	File-safe app name used for inline HTML under ~/apps/.
`html`	string	no	Complete HTML document, up to 256 KB UTF-8; mutually exclusive with path.
`path`	string	no	Existing ~-rooted .html text file; mutually exclusive with html.
`allowTools`	array	no	OS tool names the app may call; omitted means no tools.
`x`	number	no	Optional work-area horizontal position in CSS pixels.
`y`	number	no	Optional work-area vertical position in CSS pixels.
`width`	number	no	Optional window width in CSS pixels.
`height`	number	no	Optional window height in CSS pixels.
`focus`	boolean	no	Whether to focus the new window; defaults to true.

Raw JSON schema

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 40,
      "pattern": "^[A-Za-z0-9][A-Za-z0-9-_]*$",
      "description": "File-safe app name used for inline HTML under ~/apps/."
    },
    "html": {
      "type": "string",
      "maxLength": 262144,
      "description": "Complete HTML document, up to 256 KB UTF-8; mutually exclusive with path."
    },
    "path": {
      "type": "string",
      "description": "Existing ~-rooted .html text file; mutually exclusive with html."
    },
    "allowTools": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 16,
      "description": "OS tool names the app may call; omitted means no tools."
    },
    "x": {
      "type": "number",
      "description": "Optional work-area horizontal position in CSS pixels."
    },
    "y": {
      "type": "number",
      "description": "Optional work-area vertical position in CSS pixels."
    },
    "width": {
      "type": "number",
      "description": "Optional window width in CSS pixels."
    },
    "height": {
      "type": "number",
      "description": "Optional window height in CSS pixels."
    },
    "focus": {
      "type": "boolean",
      "description": "Whether to focus the new window; defaults to true."
    }
  },
  "required": [
    "name"
  ],
  "additionalProperties": false
}

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