bug: Browser tool does not support custom viewport size for screenshots

[JKGeovision]

Hello,

I discovered a limitation where the browser tool does not allow setting a custom viewport size. The browser is launched with a fixed container viewport of 780x493 pixels, and there is no configuration option to change it.

This makes it impossible to take high-resolution screenshots (e.g. 1920x1080) using the integrated browser tool. The only option is to bypass the browser tool entirely and use chromium --headless --screenshot --window-size=1920,1080 directly from the command line, which defeats the purpose of having the browser tool for interactive browsing.

Steps to reproduce:

1. Use the browser_navigate tool to open a website
2. Use the browser_screenshot tool to capture a screenshot
3. The resulting screenshot is only 780x493 pixels

What I tried:

• browser_evaluate('window.resizeTo(1920, 1080)') — does not work in headless mode
• Checked for a cptr config file (e.g. ~/.cptr/config.yaml) — none exists
• No viewport_size parameter is exposed on any browser tool function

Thank you for your work, and I wish you all a great day,
Joshua Krimmer

[owui-terminator]

🔍 Related Issues Found

I found some existing issues that might be related. Please check if any of these are duplicates or contain helpful solutions:

1. 🟢 #15 feat: computer control / computer use
   This is the only issue found touching screenshot taking/browser control in this repository. It appears to be a broad request for computer/browser interaction, which is the same feature area as the viewport-size limitation.
   by Classic298

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💡 If your issue is a duplicate, please close it and add any additional details to the existing issue instead.

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