Remote Control: can read session from mobile but cannot send messages back

Summary

When Remote Control is active in a Claude Code terminal session, the mobile side can see the conversation in real-time but messages sent from mobile never reach the terminal session. It's read-only in practice.

Steps to reproduce

1. Enable Remote Control in a Claude Code terminal session (/remote-control)
2. Open the active session on a mobile device (tested: Claude iOS app and mobile browser)
3. Observe that the terminal session output is visible on mobile
4. Attempt to send a message from the mobile side — message does not go through

Expected behavior

Messages sent from mobile should be received by the terminal session (two-way control).

Actual behavior

Mobile is effectively read-only. Sent messages are not received by the terminal.

Environment

• Claude Code version: latest (up to date as of 2026-05-25)
• Terminal OS: Windows 11 Pro
• Mobile: iOS, tested both native Claude app and mobile Safari/Chrome browser
• Account: same account on both terminal and mobile
• remoteControlAtStartup: true in settings.json

Attempted fixes

• Uninstalled and reinstalled the mobile app
• Tried mobile browser instead of app
• Verified same account on both devices
• Verified Claude Code is up to date