Names the domain (Google Sheets) and some actions (read data, compare, identify differences), but doesn't list specific concrete actions like highlighting mismatches, generating diff reports, or specifying what kinds of differences it detects.

Describes what it does (read and compare data from two tabs) but has no explicit 'Use when...' clause or trigger guidance, which per the rubric should cap completeness at 2, and the 'what' is also somewhat thin, placing this at 1.

Includes 'Google Sheet' and 'tabs' which are natural terms, but misses common variations like 'spreadsheet', 'worksheet', 'compare columns', 'diff', 'discrepancies', or file extensions like '.gsheet'.

The combination of 'Google Sheet' + 'two tabs' + 'compare differences' is fairly specific, but could overlap with general spreadsheet analysis or data comparison skills. The scope is narrow enough to avoid major conflicts but not explicitly carved out.

The skill is lean and efficient. No unnecessary explanations of what Google Sheets are or how comparisons work. Every line serves a purpose.

Steps 1 and 2 provide concrete, executable commands with clear syntax, but step 3 ('Compare the data and identify changes') is vague and lacks any concrete guidance on how to actually perform the comparison—no code, no specific approach, no output format.

The three steps are listed but step 3 is essentially undefined, leaving the core task (comparison) without any clear process, validation, or expected output. There's no guidance on what 'differences' look like or how to handle edge cases.

For a simple skill under 50 lines, the structure is appropriate: a clear prerequisite callout, a brief description, and numbered steps. The reference to the gws-sheets skill is well-signaled and one level deep.