Chrome Debug MCP Server

Instructions

Implementation Reference

• src/browserSession.ts:516-520 (handler)

  The main handler function for the scroll_up tool. It uses doAction to execute the scrollPage helper with 'up' direction on the current page.

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

• src/index.ts:118-125 (schema)

  Tool schema definition in the list of tools returned by ListToolsRequestSchema handler, specifying name, description, and empty input schema (no parameters required).

  {
  	name: "scroll_up",
  	description: "向上滚动页面一个视口高度",
  	inputSchema: {
  		type: "object",
  		properties: {},
  	},
  },

• src/index.ts:207-209 (registration)

  Dispatch/registration in the CallToolRequestSchema switch statement, invoking the browserSession.scrollUp() handler.

  case "scroll_up":
  	result = await this.browserSession.scrollUp();
  	break;

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

  Supporting helper function that performs the actual page scrolling by one viewport height in the specified direction, used by both scrollUp and scrollDown.

  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);
  }