LaunchDevelopersJuly 20, 2026

Claude Code 2.1.216 adds sandbox.filesystem.disabled, fixes long-session stalls

The release ships 40 CLI changes and one system prompt change, adding a sandbox.filesystem.disabled setting that skips filesystem isolation while keeping network egress control. It also fixes a slowdown where message normalization cost grew quadratically with the number of turns, causing multi-second stalls and slow resumes.

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