[BUG] Shared chat experience is poor

Preflight Checklist

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

What's Wrong?

1. Shared Claude Code session links fail silently for users without Claude Code access — black screen on mobile, confusing upgrade prompt on desktop. At minimum, show a clear message explaining that the link requires a Claude Code-eligible plan.
2. When shared via iMessage, the link does not open. The user must copy/paste the link into the browser but there is no instruction to do so.

What Should Happen?

1. Clear instructions should be provided to the sharer, explaining the requirements for the recipient.
2. A working link should be provided that works across sharing methods.
3. The link should resolve to a landing page with clear instructions about required steps to view the shared chat.

Error Messages/Logs

Steps to Reproduce

Share a chat with someone that doesn’t have Claude code. Then ask them what their experience was.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Idk

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Other

Additional Information

_No response_