What: Files mentioned with @ are no longer re-read if they haven't been modified since the last read.
Details:
- Prevents redundant file reads when the same file is mentioned multiple times
- Checks file modification timestamps before reading
- Returns cached content if file is unchanged
- New
already_read_fileattachment type (not shown to user) - Primarily benefits files that were written by Claude during the session
- Evidence:
PE0()at line 398623 with timestamp checking at lines 398630-398649