ide_opened_file context injection is frequently harmful and should be opt-out

Description

The ide_opened_file feature that injects "The user opened file X in the IDE" into conversation context is net-negative in practice. Opening or switching tabs in VS Code triggers irrelevant context injection that derails conversations and has caused errors.

Actual Behavior

• Switching tabs or opening files injects <ide_opened_file> messages into the active conversation
• These are almost never relevant to the current task
• Claude sometimes acts on them (e.g., reading the file, changing topic)
• Has directly caused errors in multi-step workflows

Expected Behavior

• This feature should be opt-in or opt-out via settings
• Or: only inject when the user explicitly references the file
• Or: remove entirely

Environment

• VS Code extension
• Windows 11
• Claude Opus 4.6