Thinking blocks broken in VSCode extension v2.1.198 (regression from v2.1.197) [BUG]
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?
Extended thinking blocks stopped working in the VSCode Claude Code extension starting from version 2.1.198. The feature works correctly on 2.1.197 and earlier.
Symptoms on 2.1.198:
Thinking blocks are not clickable/expandable — the "Thought for X sec" label renders but clicking does nothing
Sometimes "Thought for X sec" doesn't render at all; requires Developer: Reload Window to get it to appear
Symptoms on ≤ 2.1.197:
Thinking blocks render and expand correctly with no issues
What Should Happen?
I should be able to see the thinking part
Eg Thought for X seconds
(The case when its not rendered)
And if the its rendered then i should be able to click on it so that the drop down appears and i see the entire thinking for that prompt
Error Messages/Logs
Steps to Reproduce
Steps to reproduce:
Install Claude Code VSCode extension v2.1.198
Enable extended thinking (set thinking: true in config)
Send any prompt that triggers a thinking response
Observe: thinking block either doesn't render or renders but is not clickable
Workaround:
Downgrade to v2.1.197 via Install Another Version in the VSCode Extensions panel.
Environment:
OS: Windows 11
VSCode version: 1.127.0 (x64)
Broken version: 2.1.198
Last working version: 2.1.197
Model: claude-sonnet-4-6
Claude Model
Sonnet (default)
Is this a regression?
Yes, this worked in a previous version
Last Working Version
2.1.197
Claude Code Version
2.1.198
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
VS Code integrated terminal
Additional Information
_No response_