Chrome Debug MCP Server

Instructions

Implementation Reference

• src/browserSession.ts:507-511 (handler)

  The main handler function scrollDown that executes the downward scrolling by calling doAction with scrollPage.

  async scrollDown(): Promise<BrowserActionResult> {
  	return this.doAction(async (page) => {
  		await this.scrollPage(page, "down");
  	});
  }

• src/index.ts:110-117 (schema)

  Tool schema definition in the listTools response, including name, description, and empty input schema.

  {
  	name: "scroll_down",
  	description: "向下滚动页面一个视口高度",
  	inputSchema: {
  		type: "object",
  		properties: {},
  	},
  },

• src/index.ts:203-205 (registration)

  Registration and dispatch in the CallToolRequestSchema handler switch statement.

  case "scroll_down":
  	result = await this.browserSession.scrollDown();
  	break;

• src/browserSession.ts:490-502 (helper)

  Helper function scrollPage that performs the actual scrolling logic using page.evaluate and window.scrollBy.

  private async scrollPage(page: Page, direction: "up" | "down"): Promise<void> {
  	const { height } = this.getViewport();
  	const scrollAmount = direction === "down" ? height : -height;
  
  	await page.evaluate((scrollHeight) => {
  		window.scrollBy({
  			top: scrollHeight,
  			behavior: "auto",
  		});
  	}, scrollAmount);
  
  	await delay(300);
  }