chromium-arm64

Instructions

Implementation Reference

• index-browser-only.js:350-380 (handler)

  Main handler function that executes the screenshot tool logic: ensures Chromium is running, optionally sets full-page metrics, captures screenshot via Page.captureScreenshot CDP command, saves as PNG to /tmp/, and returns success message.

  async screenshot(name = 'screenshot.png', fullPage = false) {
    await this.ensureChromium();
    
    const screenshotParams = { format: 'png' };
    
    if (fullPage) {
      const metrics = await this.sendCDPCommand('Page.getLayoutMetrics');
      await this.sendCDPCommand('Emulation.setDeviceMetricsOverride', {
        width: metrics.contentSize.width,
        height: metrics.contentSize.height,
        deviceScaleFactor: 1,
        mobile: false,
      });
      screenshotParams.clip = {
        x: 0,
        y: 0,
        width: metrics.contentSize.width,
        height: metrics.contentSize.height,
        scale: 1,
      };
    }
  
    const screenshot = await this.sendCDPCommand('Page.captureScreenshot', screenshotParams);
    const screenshotPath = `/tmp/${name}`;
    
    fs.writeFileSync(screenshotPath, screenshot.data, 'base64');
    
    return {
      content: [{ type: 'text', text: `Screenshot saved to ${screenshotPath}` }],
    };
  }

• index-browser-only.js:129-147 (registration)

  Registration of the 'screenshot' tool in the ListToolsRequestSchema handler, defining name, description, and input schema for parameters 'name' and 'fullPage'.

  {
    name: 'screenshot',
    description: 'Take a screenshot of the current page',
    inputSchema: {
      type: 'object',
      properties: {
        name: {
          type: 'string',
          description: 'Name for the screenshot file',
          default: 'screenshot.png',
        },
        fullPage: {
          type: 'boolean',
          description: 'Capture full page',
          default: false,
        },
      },
    },
  },

• index-browser-only.js:182-183 (handler)

  Dispatch handler in CallToolRequestSchema switch statement that invokes the screenshot method with parsed arguments.

  case 'screenshot':
    return await this.screenshot(args.name, args.fullPage);