xiaweiwei67-stack fcc520df47 fix(read): correct off-by-one for negative offset with trailing newline ...

The Read tool documents that a negative offset reads from the end (-N = last N lines). Content is split on newline, so a file ending in a newline produces a trailing empty element and total_file_lines is one too high. Every negative offset was therefore off by one: offset=-1 returned the empty string after the final newline instead of the last line, and -N returned N-1 real lines.

Exclude the trailing empty element when computing the start line for negative offsets. Adds regression tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-07-07 16:53:35 +08:00

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