mcp__claude-in-chrome resize_window reports success but does not change viewport size

Bug

resize_window (Claude in Chrome MCP tool) returns "Successfully resized window
containing tab <id> to <W>x<H> pixels" but the tab's actual viewport is
unchanged — verified via window.innerWidth/window.innerHeight in the same
tab immediately after the call.

Repro

1. Open any page in a Claude-in-Chrome tab (tested on a live WordPress

admin page, desktop-sized window ~1360-1470px wide).

1. Call resize_window with a mobile size, e.g. {width: 390, height: 844}.
2. Tool returns success: "Successfully resized window containing tab <id>

to 390x844 pixels".

1. Call javascript_tool with window.innerWidth — returns the original

desktop width (e.g. 1359, 1464), not 390.

1. A screenshot taken after the resize call still shows the full desktop

layout, not a mobile layout — confirmed CSS media queries (max-width:
768px) did not re-trigger.

Reproduced twice in the same session, on two different pages, with a range
of target sizes (390x844, 414x896, 500x900) — all reported success, none
changed window.innerWidth.

Impact

Any responsive/mobile-viewport verification workflow that relies on
resize_window for this tool silently produces a false-positive "verified
at mobile width" result — the screenshot/DOM read after the call is still
the desktop render, with no error or signal that the resize didn't happen.

Workaround used

Injected a same-origin <iframe> sized to the target viewport
(width:390px;height:844px) pointing at the same URL, then screenshotted/
zoomed into that region. This correctly triggers the CSS media query at
the iframe's own viewport width since iframes get their own layout
viewport. Not a real substitute for actual window/device-metrics resize
(cross-origin pages, JS relying on window.top, etc. would behave
differently), but useful as a stopgap for same-origin responsive checks.

Environment

• Platform: macOS (Darwin)
• Claude Code CLI, claude-in-chrome MCP server
• Reproduced in a non-interactive session; window is a real Chrome window

(not headless)