preview_start (browser tool) reliably crashes Claude Code desktop, triggers MSIX reinstall prompt

Description

Claude Code (Desktop entrypoint, claude-desktop) crashes/restarts consistently right after invoking the browser preview tool (mcp__Claude_Browser__preview_start). This happened twice in a row, in the same session/project, at the exact same point in the workflow.

Environment

• OS: Windows 10 Pro 10.0.19045
• Claude Code version: 2.1.219
• Entrypoint: claude-desktop
• Model: claude-sonnet-5

Steps to reproduce

1. In an active session, call the Claude Browser MCP tool preview_start with a remote URL (e.g. {"url": "https://example.com/some-page"}).
2. Immediately after the tool call, the Claude Code desktop app closes unexpectedly.
3. On relaunch, the OS shows an MSIX installer prompt (ClaudeSetup, error HRESULT 0x80073CF8) asking to reinstall, unrelated to the project being worked on.

Observed pattern

• Occurred twice in the same working session, both times immediately after preview_start was invoked with a URL.
• Both times, the underlying project/git state was unaffected — no data loss, only the app process died.
• Between the two crashes, a separate MSIX installer error surfaced on relaunch, suggesting the crash may be corrupting or conflicting with the app's local package state.

Impact

Makes it unsafe to use the browser-preview tool for verifying live UI/production pages, since the app reliably dies mid-task.

Additional context

Not tied to a specific website being previewed — the trigger appears to be the preview_start call itself opening a browser pane, not the destination URL's content.