playwright_evaluate
Execute JavaScript code directly in the browser console to automate web interactions, extract data, or manipulate page elements during web automation tasks.
Instructions
Execute JavaScript in the browser console
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| script | Yes | JavaScript code to execute |
Implementation Reference
- src/playwright_server/server.py:260-268 (handler)The EvaluateToolHandler class provides the core implementation for executing JavaScript code in the browser context using Playwright's page.evaluate method.
class EvaluateToolHandler(ToolHandler): async def handle(self, name: str, arguments: dict | None) -> list[types.TextContent | types.ImageContent | types.EmbeddedResource]: if not self._sessions: return [types.TextContent(type="text", text="No active session. Please create a new session first.")] session_id = list(self._sessions.keys())[-1] page = self._sessions[session_id]["page"] script = arguments.get("script") result = await page.evaluate(script) return [types.TextContent(type="text", text=f"Evaluated script, result: {result}")] - The input schema defines the expected arguments for the playwright_evaluate tool, requiring a 'script' string.
types.Tool( name="playwright_evaluate", description="Execute JavaScript in the browser console", inputSchema={ "type": "object", "properties": { "script": {"type": "string", "description": "JavaScript code to execute"} }, "required": ["script"] } ), - src/playwright_server/server.py:334-344 (registration)The tool_handlers dictionary registers an instance of EvaluateToolHandler for the 'playwright_evaluate' tool name, used by the call_tool handler.
tool_handlers = { "playwright_navigate": NavigateToolHandler(), "playwright_screenshot": ScreenshotToolHandler(), "playwright_click": ClickToolHandler(), "playwright_fill": FillToolHandler(), "playwright_evaluate": EvaluateToolHandler(), "playwright_click_text": ClickTextToolHandler(), "playwright_get_text_content": GetTextContentToolHandler(), "playwright_get_html_content": GetHtmlContentToolHandler(), "playwright_new_session":NewSessionToolHandler(), }