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Tuesday, July 21, 2026

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[Release] anthropics/claude-code v2.1.216: v2.1.216

ashwin-antJul 21, 2026

Claude Code v2.1.216 is a maintenance release focused on stability and performance improvements. Key fixes address quadratic slowdown in long sessions, OAuth token handling, file isolation settings, and numerous UI/terminal rendering issues. The release also improves command validation, workflow handling, and background session management across multiple platforms including VSCode and web clients.

  • Added `sandbox.filesystem.disabled` setting to disable filesystem isolation while maintaining network egress control
  • Fixed critical performance regression where message normalization cost grew quadratically with session turns, causing multi-second stalls
  • Resolved OAuth token expiration issues preventing command execution with HTTP 401 classifier errors
  • +7 more key points...
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