Claude Opus 4.6

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

Title: Background task notifications open as editor tabs, cluttering the tab bar

Description:

When Claude Code runs background tasks (via run_in_background), the completion notifications are rendered as new editor tabs with the title <task-notification> <tas.... This creates several problems:

Tab clutter — Each completed background task adds a new tab that looks identical (<task-notification> <tas...), making it hard to distinguish between them or find actual code files
Meaningless tab names — The XML tag content gets truncated, so all notification tabs look the same
Displaces real editor tabs — In a session with multiple background tasks, the notification tabs crowd out the files you're actually working on (see screenshot)
Read-only dead weight — The tabs contain raw XML/notification content that isn't useful to keep open, but they persist until manually closed
Expected behavior:

Task completion notifications should appear in one of:

The Output panel (e.g., "Claude Code" output channel)
A notification toast (bottom-right popup)
The Claude Code chat panel itself
They should NOT open as new editor tabs.

Steps to reproduce:

Use Claude Code in VSCode Remote SSH
Have Claude run a command with run_in_background: true
When the task completes, a new editor tab opens with <task-notification> content
Environment:

VSCode (Windows 11, Remote SSH to Ubuntu 22.04)
Claude Code VSCode extension
Claude Opus 4.6

What Claude Actually Did

Use Claude Code in VSCode Remote SSH
Have Claude run a command with run_in_background: true
When the task completes, a new editor tab opens with <task-notification> content
Environment:

Expected Behavior

Task completion notifications should appear in one of:

The Output panel (e.g., "Claude Code" output channel)
A notification toast (bottom-right popup)
The Claude Code chat panel itself
They should NOT open as new editor tabs.

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

Steps to reproduce:

Use Claude Code in VSCode Remote SSH
Have Claude run a command with run_in_background: true
When the task completes, a new editor tab opens with <task-notification> content

Claude Model

Sonnet

Relevant Conversation

Impact

Critical - Data loss or corrupted project

Claude Code Version

Claude Code VSCode extension

Platform

Anthropic API

Additional Context

_No response_