Imported from zylos-ai/zylos-core (skills/upgrade-claude/SKILL.md). Install upstream with npx skills add zylos-ai/zylos-core --skill upgrade-claude. Copyright stays with the author.

Upgrade Claude Code Skill

Upgrade Claude Code to the latest version - sends /exit, waits for exit, upgrades, and lets activity-monitor restart.

When to Use

• User explicitly asks to upgrade Claude Code
• New Claude Code version is available
• Need to apply Claude Code updates

Pre-Upgrade Checklist

Before launching the upgrade script, complete these steps in order:

1. Stop background tasks

Check for running background agents (Task tool). If any are active, stop them to avoid orphaned work.

2. Sync memory

Update memory files (state.md, sessions/current.md, etc.) to preserve important context that would otherwise be lost on restart.

3. Write a session handoff summary

Write a brief message covering:

• What was being worked on (active tasks, user requests in progress)
• Current state (what's done, what's pending, any blockers)
• What the next session should pick up (if anything)

4. Send the handoff summary

Send the full handoff summary to the internal void channel via C4:

cat <<'EOF' | node ~/zylos/.claude/skills/comm-bridge/scripts/c4-send.js "void" "session-handoff"
<handoff summary>
EOF

The void channel is record-only: the message is stored in C4 conversation history (so the upgraded session's startup hook, c4-session-init, includes it in startup context) but is never delivered to any real channel or display surface.

Do not send the full handoff summary to the active external user channel (Telegram, Lark, Feishu, HXA, etc.). Handoff summaries are operational context for the next agent session and may contain task state from outside the current conversation. If the user is actively waiting, send only a short user-facing notice to their current reply via path, without internal task inventory or cross-channel context.

5. Launch the upgrade script

IMPORTANT: Must use nohup ... & pattern!

nohup node ~/zylos/.claude/skills/upgrade-claude/scripts/upgrade.js >> ~/zylos/logs/upgrade.log 2>&1 &

How It Works

1. Enqueue /exit: Puts /exit into the control queue (priority=1, block_queue_until_idle) — dispatcher handles idle detection and message blocking
2. Wait for exit: Monitors Claude process until it exits (up to 120s); aborts if timeout
3. Upgrade: Runs native installer (curl -fsSL https://claude.ai/install.sh | bash)
4. Daemon restart: activity-monitor detects exit and restarts Claude automatically