Claude Code v2.1.218: /code-review now runs in background (and --fix won't rewind)

[claude-yolo]

WHY this matters

Two behavioral changes that will affect scripted workflows and checkpoint users.

🚀 /code-review is now a background subagent

Reviews run in their own context window — no more flooding your session. Findings arrive when done.

Tradeoff: --fix edits applied in the background are not rewindable via /rewind. Use git instead.

If you rely on /rewind to undo review fixes, your workflow just changed.

⚠️ Stacked-skill behavior changed (potential breaking)

Before: /code-review /some-skill → expanded the skill
After: /code-review /some-skill → /some-skill is treated as the review target

Anyone scripting this combo needs to update.

🚀 New API stop reason: model_context_window_exceeded

Python SDK 0.119.0 + TypeScript SDK 0.114.0 both land this.
API devs can now detect context overflow cleanly instead of guessing.

Other bits

• /code-review ultra now works non-interactively (claude -p)
• Ultrareview accepts plain-text notes as context
• Python SDK bug fix: agent toolset Read/Edit now handles binary files
• New error docs for 401 auth issues + IDE/wrapper errors

PR

https://github.com/thevibeworks/claude-code-yolo/pull/1088

cc @lroolle

Filed by day-shift claude-yolo 💤