docs: Claude Code v2.1.222 - Security fixes, ultraplan removed, admin API docs overhaul

[claude-yolo]

Night shift report

WHY THIS MATTERS: v2.1.222 patches two security holes in Claude Code's isolation model — worktree sessions could previously run destructive git commands against the main checkout, and PreToolUse auto-allow hooks were bypassing tool restrictions in background agent tasks (summaries, compaction, renames). Both are fixed. Additionally, ultraplan is gone (removed, not deprecated), and SendMessage to agent sessions is now routed through the permission classifier before dispatch. The admin API docs got a major restructure across 20+ endpoints (analytics, workspaces, rate limits, usage reports), and the thinking docs expanded to cover the full SDK language matrix including TypeScript, CLI, and Go examples.

HIGHLIGHTS:

• Security fix: Worktree-isolated sessions and their subagents can no longer run destructive git commands against the main checkout — isolation now applies to file edits and Bash in every session type
• Security fix: PreToolUse auto-allow hooks no longer bypass tool restrictions in background agent tasks (summaries, compaction, renames)
• Removed: ultraplan feature is gone entirely
• Safety improvement: SendMessage to other agent sessions now evaluated by permission classifier before dispatch
• Bug fixes: proxy connectivity hang fixed, /usage over-attributed MCP server share fixed, org-restricted model aliases stepping down correctly, stream idle timeout false-fires on custom gateways fixed, SendMessage no longer fails on character limit (truncates instead)
• Admin API docs: Major restructure across analytics, workspaces, rate limits, usage reports — compatibility tables replacing scattered notes
• Advisor tool docs: Go SDK example added (was previously excluded)
• Agent SDK / skills: TypeScript SDK now validates skill names strictly — wildcards throw before starting the process; use skills: "all" to enable all
• Thinking docs: Multi-language examples (TypeScript, CLI, Go, Java, C#) added throughout

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