VSCode extension: manually renamed sessions revert to last prompt text after restart

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 a session is manually renamed in the Claude Code VSCode extension sidebar, the custom name does not persist across VSCode restarts. After reopening VSCode, all session names revert to auto-generated names derived from the last prompt in the conversation.

Expected behavior
User-set session names should persist across VSCode restarts.

Actual behavior
Session names revert to the auto-generated name (truncated last prompt text) after every restart.

What Should Happen?

When a session is manually renamed in the Claude Code VSCode extension sidebar, the custom name does not persist across VSCode restarts. After reopening VSCode, all session names revert to auto-generated names derived from the last prompt in the conversation.

Error Messages/Logs

**Expected behavior**
User-set session names should persist across VSCode restarts.

**Actual behavior**
Session names revert to the auto-generated name (truncated last prompt text) after every restart.

Steps to Reproduce

1. Open Claude Code in VSCode
2. Right-click (or rename) a session in the left sidebar and give it a custom name
3. Close and reopen VSCode
4. Observe: the custom name is gone, replaced by the last prompt text

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

multiple versions

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Environment

• OS: Windows 11
• Editor: VSCode
• Claude Code: VSCode extension