resize_page fails with Protocol error: Browser.setContentsSize wasn't found

[Platano78]

Description

When calling resize_page to test mobile viewports, the command fails with a protocol error.

Error Message

Protocol error (Browser.setContentsSize): 'Browser.setContentsSize' wasn't found

Environment

• Chrome DevTools MCP version: Latest (installed via Claude Code)
• Chrome version: Unknown (remote debugging)
• Platform: Linux (WSL2)
• Claude Code: CLI

Steps to Reproduce

1. Navigate to any page using navigate_page
2. Call resize_page with mobile dimensions:

resize_page(width=414, height=896)

3. Observe protocol error

Expected Behavior

Page viewport should resize to specified dimensions for mobile testing.

Actual Behavior

Command fails with Browser.setContentsSize not found error.

Workaround

Currently using emulate for CPU/network throttling, but cannot test mobile viewport sizes.

Additional Context

This appears to be a Chrome DevTools Protocol compatibility issue - Browser.setContentsSize may not be available in all Chrome versions or may have been deprecated.

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Filed from Claude Code session