Conciseness

At roughly 20 directive lines, every sentence carries guidance — style precedence, help discovery, preservation rules, a pre-save inspection checkpoint, and optionality notes. No sentence explains Excel or CLI concepts Claude already knows, so it matches anchor 5 ('lean and efficient; assumes Claude's competence') rather than anchor 4, which would require at least minor over-explanation to trim.

Actionability

The body gives a concrete executable command pattern ('Discover exact actions and flags with `excelcli <command> --help`'), an explicit style precedence order, and concrete preservation rules, matching anchor 4. It is not anchor 5 because no specific inline examples of number formats, colours, or commands are given — those are deferred to the reference guide — and not anchor 3 because the guidance given is executable, not pseudocode-level.

Workflow Clarity

A clear sequence is present: resolve style precedence, read the guide, discover commands via --help, apply formatting, then 'Inspect the affected formats and calculated outputs before saving the authorized result' — an explicit validation checkpoint. It is not anchor 5 because no error-recovery feedback loop is described (what to do when inspection finds a problem), and not anchor 3 because a validation step before saving is explicitly stated, satisfying the batch/destructive-operation cap.

Progressive Disclosure

A concise overview with exactly one clearly-signaled, one-level-deep reference — '[the formatting guide](references/report-formatting.md)' — including when to read it ('only when neither specifies a style', 'for the requested report, not unrelated workbook work') and an external link explicitly scoped as 'not another required skill'. This matches anchor 5's pattern of well-signaled shallow references; note the referenced file was not present in the review workspace, so its contents could not be verified, but the body's structure is exemplary.

Specificity

The description names a single concrete action — 'Apply optional presentation conventions' — but enumerates several specific deliverables: 'readable headers, meaningful number formats, financial-model colours, and report layout'. This exceeds the anchor-3 example (domain plus 1-2 actions) but falls short of anchor 5, whose exemplars list multiple distinct actions (extract, fill, merge, convert); the capabilities here are all variations of one 'apply formatting' action with minor coverage gaps.

Completeness

Both what and when are explicit: what — 'Apply optional presentation conventions... readable headers, meaningful number formats, financial-model colours, and report layout'; when — 'Use for... when the user requests Excel report formatting or a new reader-facing report through excelcli', plus explicit do-not-load boundaries. This mirrors the anchor-5 exemplar pattern of clear what plus concrete trigger phrases, so it is not the anchor-4 case where 'when' could be more specific.

Trigger Term Quality

Natural phrases users would actually say are present — 'Excel report formatting', 'new reader-facing report', 'report layout', 'headers', 'number formats'. A few natural variations are missing (e.g., 'make the report look good', 'presentation/polish', 'spreadsheet style'), so it matches anchor 4 rather than the comprehensive synonym coverage of anchor 5, while clearly exceeding the sparse keyword sets of anchors 2-3.

Distinctiveness Conflict Risk

A clear niche (reader-facing report presentation via excelcli) with explicit exclusions — 'Do not load for ordinary reads, raw exports, targeted data updates, Power Query or Data Model work, or failure recovery' — minimizes conflict with adjacent Excel skills. It matches anchor 5's clear-niche/distinct-trigger profile and is clearly better than the 'minor overlap risk' of anchor 4.