[BUG] [macOS] Artifact preview panel not rendering in Claude Desktop - M1 Pro

Preflight Checklist

• [x] I am using the latest version of Claude Code
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I have searched existing issues and this hasn't been reported yet

What's Wrong?

Description

The artifact preview panel (right side of the screen) does not appear when Claude generates code or HTML artifacts in Claude Desktop on macOS. However, the same artifacts render correctly in claude.ai (web version).

Environment

• OS: macOS
• Mac Model: MacBook Pro M1 Pro
• Claude Desktop Version: [escribe aquí la versión que veas en Acerca de Claude]
• Works in Web: Yes (claude.ai)
• Works in Desktop: No

<img width="1302" height="777" alt="Image" src="https://github.com/user-attachments/assets/dffea5a1-0c96-4afa-837d-3eb3730c6fed" />

What Should Happen?

Expected Behavior

The artifact preview panel should appear on the right side showing the rendered HTML/code in real-time.

Error Messages/Logs

## Actual Behavior
The right-side panel remains empty. Claude must be asked to present/download the file instead of showing the preview.

Steps to Reproduce

Steps to Reproduce

1. Open Claude Desktop on macOS M1 Pro
2. Ask Claude to create an HTML artifact (e.g., "Create a simple HTML page with 'Hello World'")
3. Claude generates the artifact and shows in chat
4. The right-side preview panel does NOT appear
5. Same request in claude.ai shows the preview panel correctly

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.21459.3 (e0f338) 2026-07-16T05:40:26.000Z

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Additional Context

• Code execution and file creation is enabled in Settings > Capabilities
• This appears to be a rendering issue specific to Claude Desktop macOS
• The same account and artifacts work fine in the web version