Claude Code v2.1.216 adds filesystem sandbox opt-out and fixes worktree git isolation
Anthropic
Claude Code v2.1.216, released July 20, 2026, adds a sandbox.filesystem.disabled setting to skip filesystem isolation while keeping network egress control, fixes a quadratic message-normalization slowdown in long sessions, and patches several worktree-isolation bugs where subagents could redirect git operations into a shared checkout.
Why it matters
The worktree git-isolation bug could let a subagent's git commands leak into the wrong repository checkout, and the sandbox opt-out gives teams finer control over filesystem vs. network isolation.
Importance: 2/5
Incremental CLI release with real reliability and isolation fixes; official GitHub release notes only.