Steel MCP Server

Instructions

Implementation Reference

• src/index.ts:781-800 (handler)

  The main handler function that executes the scroll_down tool. It scrolls the page down by the specified number of pixels using window.scrollBy, or presses PageDown if no pixels are provided.

  async function handleScrollDown(
    page: Page,
    args: any
  ): Promise<CallToolResult> {
    const { pixels } = args;
    if (pixels !== undefined) {
      await page.evaluate((scrollAmount) => {
        window.scrollBy(0, scrollAmount);
      }, pixels);
    } else {
      await page.keyboard.press("PageDown");
    }
  
    return {
      isError: false,
      content: [
        { type: "text", text: `Scrolled down by ${pixels ?? "one page"}` },
      ],
    };
  }

• src/index.ts:522-537 (schema)

  The tool definition including name, description, and input schema for the scroll_down tool. Pixels is an optional integer parameter.

  {
    name: "scroll_down",
    description:
      "Scroll down the page by a pixel amount - if no pixels are specified, scrolls down one page",
    inputSchema: {
      type: "object",
      properties: {
        pixels: {
          type: "integer",
          description:
            "The number of pixels to scroll down. If not specified, scrolls down one page.",
        },
      },
      required: [],
    },
  },

• src/index.ts:928-929 (registration)

  The switch case in the main tool dispatcher (handleToolCall) that routes scroll_down calls to the handleScrollDown function.

  case "scroll_down":
    result = await handleScrollDown(page, args);