Conciseness

Every sentence conveys plugin-specific operational knowledge Claude could not know (launcher via "npx -y @sbroenne/excelcli@latest", AutoSave behavior, "errorMessage as the single error-text field"), with no padding and no explanation of known concepts. This matches the 'lean and efficient; every token earns its place' anchor.

Actionability

Concrete, executable commands are provided ("& \"<plugin-root>\\bin\\start-cli.ps1\" --help", "session discover", "session attach --workbook-id <ID>") with named flags and error fields, fitting 'mostly executable guidance with minor gaps'. Not a 5 because the core read/write/formula operations have no example commands — they are deferred to native --help — and the plugin-root placeholder must be substituted by the reader.

Workflow Clarity

The sequence is coherent (discover launcher → --help → inspect workbook state → session discover → verify complete/errors → confirm workbookId → attach → explicit save/close) with real validation checkpoints ("an incomplete scan cannot establish that a workbook is absent") and failure guidance ("inspect its reported partial state rather than assuming rollback"). Not a 5 because the steps and checkpoints are embedded in prose rather than an explicit ordered list or checklist, so the sequencing must be inferred.

Progressive Disclosure

The ~35-line body is self-contained with no nested references, appropriately split content, or inlined material that belongs elsewhere, and the sole cross-skill pointer ("Load excel-cli-report-formatting only for requested report presentation") is clearly signaled. Not a 5 because organization is minimal — a single heading for the whole body, with launcher discovery, session workflow, error handling, and boundaries packed into undifferentiated paragraphs that would benefit from subheadings.

Specificity

The description lists several concrete actions — "including reads, writes, formulas, data refreshes, and workbook automation" — plus a concrete mechanism ("the installed excel-cli plugin's npx launcher and native help"), matching the 'several specific actions; minor gaps' anchor. It is not a 5 because "workbook automation" is generic and coverage of narrower capabilities (e.g., session/save/close handling) is absent.

Completeness

The "what" is clear ("Discover and launch the Excel CLI for ordinary Excel workbook requests on Windows"), but there is no "Use when..." clause or equivalent explicit trigger guidance; "Use the installed excel-cli plugin's npx launcher" describes how, not when. Per the judging guideline, a missing 'Use when...' clause caps completeness at 3, and this exactly matches the score-3 anchor ('what' clear, 'when' missing or only weakly implied).

Trigger Term Quality

Natural terms users would say are present — "Excel", "workbook", "reads, writes, formulas", "Windows" — giving good keyword coverage per the score-4 anchor. Not a 5 because common variations like "spreadsheet" and the file extension ".xlsx" are missing.

Distinctiveness Conflict Risk

The niche is well-defined (Windows desktop Excel via the excel-cli plugin's CLI) and it explicitly disambiguates from a closely related skill ("report presentation conventions are a separate optional skill"), fitting 'mostly distinct; minor overlap risk'. Not a 5 because generic phrases like "reads, writes, formulas, data refreshes" could overlap with other Excel-handling skills.