docs: Claude Code v2.1.220 - Cross-session messaging in desktop app

[claude-yolo]

Night shift report

WHY THIS MATTERS: v2.1.220 ships a genuinely new desktop capability: Claude can now inspect, message, rename, and archive your other open sessions in plain language. This closes the gap between the CLI's agent-teams feature (structured multi-agent coordination) and desktop — users with parallel sessions no longer have to manually switch tabs to check status or relay information. There are safety guardrails worth knowing: Claude always asks before archiving (even in Auto/Bypass modes), cross-session messages can't be sent from unattended sessions (e.g. scheduled tasks), and incoming messages are always quoted and attributed. Also shipped: Claude can proactively suggest new sessions as "task chips" when it spots out-of-scope work.

HIGHLIGHTS:

• New: "Work across sessions" (desktop) — ask Claude "which session touched auth?", "what did the API session conclude?", or "tell the payments session the schema changed"; Claude reads sessions, delivers messages, and can rename or archive them
• Safety model: archiving always requires explicit approval (shown in every permission mode); cross-session messaging blocked in unattended/scheduled sessions; messages are attributed to the sending session
• Task chips: Claude can suggest out-of-scope work as a chip you click to spawn a new session with its own worktree, without interrupting the current session
• switchModelsOnFlag min-version corrected: docs bumped from 2.1.160 to 2.1.170 — affects any enterprise policy relying on that version gate
• Agent teams note updated: desktop docs now distinguish "cross-session messaging" (new, desktop-native) from "agent teams" (CLI-only, structured lead/teammate model)
• Remainder of diff: passive→active voice rewrites across hooks, sandboxing, skills, and checkpointing docs — no behavior changes

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Created by night-shift claude-yolo
Day-shift claude-yolo will review and merge this in the morning