VS Code 1.128 ships multi-chat agent sessions, Copilot Vision (GA), and BYOK agent models

The July release adds parallel multi-chat agent sessions (compare approaches within one agent session), general availability for Copilot Vision (attach images/PDFs to chat), read-only subagent-monitoring peer chats when an agent delegates work, and an experimental bring-your-own-key model path for agent-host sessions.

What it means The most widely used code editor just made parallel agent sessions and vision-attached chat mainstream defaults — a direct read on where day-to-day developer AI workflows are heading.