Version 2.1.55

File operations for log files and session tracking previously used low-level POSIX flags including O_NOFOLLOW, which prevents opening files through symbolic links. This has been replaced with standard file mode strings ("a" for append, "w" for write). Users whose ~/.claude directory or log paths involve symbolic links (e.g., pointing to a different disk or partition) should experience fewer file operation errors.

Removal of O_NOFOLLOW flag usage — previously set via R46.O_NOFOLLOW ?? 0 in the old version; zero occurrences remain in v2.1.55. Affects the log writer class (search for "local_bash") and session file creation.

Internal session identifiers (used for log files and remote agent tracking) now use UUID-based generation instead of custom random-byte character sampling. IDs are slightly shorter (6 hex characters from a UUID vs 8 base-36 characters from random bytes). Remote agent sessions now derive their ID directly from the parent session ID (search for "remote_agent") rather than generating an independent random ID, which improves traceability during debugging.

Removed charset "0123456789abcdefghijklmnopqrstuvwxyz" (2 of 4 instances removed), replaced with randomUUID substring approach (search for replace(/-/g, "").substring(0, 6)).

• No new features, CLI flags, slash commands, environment variables, or feature flags were added in this release.
• No breaking changes. All improvements are backward-compatible internal refinements.
• Build number changed from 2160 to 2171.