Three fixes for sidebar agent UX:
- System prompt: "Be CONCISE. STOP as soon as the task is done. Do NOT keep
exploring or doing bonus work." Prevents agent from endlessly taking
screenshots and highlighting elements after answering the question.
- switchTab(id, opts): new bringToFront option. Internal tab pinning
(BROWSE_TAB) uses bringToFront: false so agent commands never steal
window focus from the user's active app.
- Keep opus model (not sonnet) for prompt injection resistance on untrusted
web pages. Remove Write from allowedTools (agent only needs Bash for $B).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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