Conciseness

Every section carries non-obvious, environment-specific knowledge Claude cannot be assumed to know: recalc exit-code semantics ("errors_found exits 0, so never treat a clean exit as a clean workbook"), the `_xlfn.` prefix list, spill-function truncation, and `data_only` pitfalls. There is no padding and no explanation of concepts Claude already knows; the only candidate for trimming (the external-link paragraph) delivers a distinct actionable fact per sentence.

Actionability

Guidance is fully executable: the exact command `python scripts/recalc.py output.xlsx [timeout_seconds]`, concrete formula strings (`sheet['B10'] = '=SUM(B2:B9)'`, `='Assumptions Inputs'!$B$5`), explicit color RGB values, number-format strings (`$#,##0;($#,##0);-`), and a decision table routing each task type to an approach.

Workflow Clarity

The workflow has explicit validation with feedback loops: recalc JSON output interpretation ("Fix what it names and run it again"), a hard ship gate ("Never ship while recalc.py reports errors_found"), a pre-build checkpoint ("Write 2–3 formulas first and check they pull the values you expect, before building out a grid"), and guidance to verify inherited vs. introduced errors. The destructive/batch cap at 3 does not apply because validation is pervasive and explicit, so the top anchor fits.

Progressive Disclosure

The body is a well-sectioned overview whose referenced bundle files (`scripts/recalc.py`, `scripts/office/soffice.py`) exist in the bundle and are clearly signaled ("Script paths below are relative to this skill's directory"), one level deep with no nested reference chains. All inline content (gotchas, requirements, conventions) is core operational guidance that appropriately lives in SKILL.md rather than separate files.

Specificity

The description lists multiple concrete actions ("Create, edit, analyze, or convert") and enumerates specific domain tasks — "formulas, formatting, financial models, multi-sheet workbooks, and tabular cleanup exported to Excel" — giving comprehensive coverage of the skill's capabilities with no vague filler.

Completeness

Both questions are answered explicitly: the "what" ("Create, edit, analyze, or convert Excel spreadsheets... where the workbook file is the primary deliverable") and the "when" via a concrete "Use for formulas, formatting, financial models..." trigger clause plus "Also applies to .csv/.tsv when the user wants spreadsheet output". This matches the top anchor; it is not score 4 because the "when" is explicit with concrete trigger phrases rather than merely present.

Trigger Term Quality

Natural user phrasing is comprehensively covered with synonyms and file extensions: "Excel spreadsheets", ".xlsx, .xlsm, .xltx", ".csv/.tsv", "spreadsheet output", "formulas", "financial models". It matches the anchor's standard of including both everyday terms and extensions.

Distinctiveness Conflict Risk

The niche is distinct (Excel workbook as primary deliverable) and conflict risk is minimized by an explicit exclusion list: "Do NOT use for Word documents, HTML reports, standalone Python scripts, database pipelines, or Google Sheets API work". No neighboring anchor fits better.