Claude Code v2.1.218 moves /code-review to a background subagent
Anthropic
Following v2.1.217's subagent concurrency cap, Claude Code v2.1.218 (July 22, 2026) makes /code-review run as a background subagent instead of filling the main conversation, adds emoji shortcode autocomplete in the prompt input, and fixes Windows path corruption with \u-prefixed segments, stale /context token counts, auto-compact never triggering for Claude Opus 4.8 on Bedrock, and MCP connection errors now surfacing HTTP status/error text in `claude mcp list` and `/mcp`.
Why it matters
Running code review as a background subagent keeps the main conversation uncluttered during long agentic sessions, continuing a run of reliability fixes to Claude Code's subagent system.
Importance: 2/5
Incremental update continuing yesterday's release; workflow/UX and reliability fixes.