WHY this matters
v2.1.216 fixes a real pain point: message normalization was O(n²) — long sessions caused multi-second stalls and slow resumes. If you run Claude Code in CI or have power users doing long conversations, this release is worth noting.
Key changes
- 🚀 Perf fix (long sessions): Quadratic message normalization cost — now fixed. Notably affects CI pipelines and long interactive sessions.
- 🚀
sandbox.filesystem.disabled: New operator setting to skip filesystem isolation while keeping network egress control.
- 🔒 Worktree isolation hardened: Subagents could escape via
git -C, --git-dir, GIT_DIR/GIT_WORK_TREE env vars. Fixed.
- Cloud session resilience: Dropped messages on container restart — now re-runs interrupted turn on resume.
- OAuth mid-session fix: 401 errors after token rotation no longer block auto mode.
/rewind symlink safety: No longer follows symlinks/hardlinks when restoring checkpoints.- Windows fixes: Non-ASCII bash parsing, PowerShell Unicode validation, network paths.
- Background agent fixes: Prompt and tool restrictions now restored on session resume.
Reference
PR: thevibeworks/claude-code-docs#1076
/cc @lroolle
WHY this matters
v2.1.216 fixes a real pain point: message normalization was O(n²) — long sessions caused multi-second stalls and slow resumes. If you run Claude Code in CI or have power users doing long conversations, this release is worth noting.
Key changes
sandbox.filesystem.disabled: New operator setting to skip filesystem isolation while keeping network egress control.git -C,--git-dir,GIT_DIR/GIT_WORK_TREEenv vars. Fixed./rewindsymlink safety: No longer follows symlinks/hardlinks when restoring checkpoints.Reference
PR: thevibeworks/claude-code-docs#1076
/cc @lroolle