[BUG] Session name reverting after manual change

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?

When I manually rename a session, the name reverts back to the auto-generated name (derived from the first message) as soon as a new command runs or a tool is executed.

Environment

Claude Code version:
OS: Windows 11
VSCode

What Should Happen?

A manual rename should persist permanently, regardless of subsequent activity in the session.

Error Messages/Logs

There is no error message because it doesn't create an actual error.

Steps to Reproduce

Steps to reproduce

Start a session — it gets auto-named from the first message
Manually rename the session
Run any command or send a message that triggers a tool call
Session name reverts to the original auto-generated name

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.153

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_