playwright-browser-evaluate

Usage

Use the MCP tool dev-swarm.request to send the payload as a JSON string:

{"server_id":"playwright","tool_name":"browser_evaluate","arguments":{}}

Tool Description

Evaluate JavaScript expression on page or element

Arguments Schema

The schema below describes the arguments object in the request payload.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "function": {
      "type": "string",
      "description": "() => { /* code */ } or (element) => { /* code */ } when element is provided"
    },
    "element": {
      "description": "Human-readable element description used to obtain permission to interact with the element",
      "type": "string"
    },
    "ref": {
      "description": "Exact target element reference from the page snapshot",
      "type": "string"
    }
  },
  "required": [
    "function"
  ],
  "additionalProperties": false
}

Background Tasks

If the tool returns a task id, poll the task status via the MCP request tool:

{"server_id":"playwright","method":"tasks/status","params":{"task_id":"<task_id>"}}