Claude Code 2.1.221 release notes

Version

2.1.221

Released

4 August 2026

Status

Stable release

What's new in Claude Code 2.1.221

The official notes for Claude Code 2.1.221 list 39 changes: 2 new features, 17 fixes, 1 performance improvement, 2 security changes and 17 other changes.

• 2 new features
• 17 fixes
• 1 performance improvement
• 2 security changes
• 17 other changes

Highlights

• security change Added mode: "mask" for sandbox credential files on Linux and WSL — sandboxed commands read a sentinel copy (the whole…
• security change Improved Windows startup: process creation times are now read via a native kernel32 call instead of spawning PowerShell, so endpoint…
• new feature Added warnings to claude plugin validate when a marketplace or plugin name would be rejected by Claude Desktop's managed marketplace…
• new feature Added a prompt-audit subcommand to the claude-api skill for auditing prompts and tool descriptions for patterns written for older models
• performance improvement Improved Stats panel to count cache tokens in its token totals, with a breakdown by input, output, cache read, and…

Our short summary: changes are counted and classified automatically from the official notes, and highlights are shortened. The complete, authoritative list is in the official release notes on GitHub.

Full release notes on GitHub (Claude Code 2.1.221)

All Claude Code release notes · All releases

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