[BUG] Mismatched content block type content_block_delta text

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?

Getting a "Mismatched content block type content_block_delta text" error in the VS Code extension. The error occurs during streaming responses, causing tool calls to fail with "Stream closed" errors.

Environment:

OS: macOS 26.6.1 (Build 25G76)
VS Code: 1.132.0 (arm64)
Claude Code Extension: 2.1.227

Expected Behavior:
Tool calls should complete successfully and responses should stream without errors.

Actual Behavior:
Response stream breaks with "Mismatched content block type content_block_delta text" error. Tool permission requests fail with "AbortError: Stream closed" or "Tool permission stream closed before response received".

Additional Context:

Started happening: [FILL IN: today / after update / etc.]
Frequency: [FILL IN: every time / intermittent]
Network: [FILL IN: direct / VPN / corporate proxy]

What Should Happen?

Tool calls should complete successfully and responses should stream without errors.

Error Messages/Logs

Steps to Reproduce

Open Claude Code in VS Code extension
Send a message that triggers tool use (e.g., asking to run a bash command)
Error appears during response streaming

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.227

Platform

Other

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

<img width="433" height="137" alt="Image" src="https://github.com/user-attachments/assets/3edeb6d7-d148-4798-88af-b41144987426" />