[BUG] UI hangs in conversations when using tools, executing slash commands or thinking (INTRODUCED IN VERSION 2.0.50)

[ytzhakov]

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?

Since the last 2.0.50 version, claude code stalls for 1-2 second with almost every tool use (Read/Write/Update/Bash..). The UI hangs until the tool is executed, and executing the tool takes much longer that it used to. UI also hangs when using slash commands as well. So if I try /rewind, /context, /status in the conversation, UI hangs for 3 seconds before executing the slash command. UI also hangs when pasting text (even if the pasted text is only 2 characters long)

The longer the conversation, the worse the stall and UI hangs.

REVERTING CLAUDE CODE VERSTION TO 2.0.49 FIXES THE ISSUE. IT WAS INTRODUCED IN VERSION 2.0.50

What Should Happen?

Claude code should execute tools without UI hangs and with no 1-2 second stall.

Error Messages/Logs

No error logs, no output.
CPU doesnt panic, RAM usage is nominal.

Steps to Reproduce

1. Start a conversation with claude.
2. Have it use tools (Read/Write/Update/Bash...)
3. as the conversation gets longer, the UI hands at every tool call and tool execution is delayed/stalled by 1-2 secs
4. Try executing any slash command (/context, /status...)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.49

Claude Code Version

2.0.50

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information