LaunchDevelopersOctober 14, 2026

Claude Code 2.1.299 adds idle compaction and file-mention controls

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The release ships 190 CLI changes and one system prompt change. Idle compaction compacts a 200K+ token conversation left idle ~54 minutes before its one-hour prompt cache expires; CLAUDE_CODE_DISABLE_FILE_MENTIONS gives Claude only @ file paths, not contents.

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