Conciseness

The body runs ~550 lines with noticeably padded sections: the 11-part Output Format template filled with '$X,XXX' placeholder tables, and service-specific guidance repeated three times (Step 8, 'Service-Specific Analysis Guides', and Output Format §8). This matches anchor 2 ('noticeably verbose; several unnecessary... padded sections') rather than 3, because the duplication and template bulk go beyond a few lines that could merely be tightened; not 1 because there is no basic-concept explanation padding.

Actionability

Steps 1-9 supply concrete, ready-to-issue tool calls with real parameter shapes (filters={"CZ:Service": ["[service_name]"]}, group_by, granularity, cost_type) plus an executable Python snippet for savings rate — matching anchor 4 ('mostly executable guidance; concrete code with minor gaps'). Not 5 because optimization bullets like 'Utilization patterns' and 'Rightsizing opportunities' give no corresponding query, and placeholders like [service_name] are templated rather than concrete.

Workflow Clarity

A clear 9-step sequence (identify service → totals → dimensional breakdown → tags → custom dims → untagged → time patterns → optimization → cost-type comparison) with a prerequisite step and inline 'discover if dimension exists' checks before optional groupings — anchor 4 ('clear sequence with most checkpoints; minor validation gaps'). Not 5 because there are no explicit error/validation checkpoints (empty results, failed calls) in the body; error handling is only deferred to a reference file. The destructive/batch cap does not apply since all operations are read-only.

Progressive Disclosure

References exist and are clearly signaled in a 'See Also' section (best-practices.md, cloudzero-tools-reference.md, error-handling.md, dimensions-reference.md, cost-types-reference.md), but no bundle references/ directory ships with this skill, and ~280 lines of content that belongs in reference files (service-specific analysis guides, the full output format template) are inlined in SKILL.md — matching anchor 3 ('content that should be separate is inline'). Not 4 because the inlined bulk is substantial, and not 2 because navigation and signaling are present.

Specificity

The description names its domain ("a specific cloud service's costs") and several concrete actions — "detailed breakdown", "understand usage patterns", "find optimization opportunities" — with minor gaps (no mention of trend/region/tag analysis). It sits at anchor 4 ('several specific actions; minor gaps in coverage') rather than 5 because the actions are stated at a summary level without the multi-dimensional breakdown detail, and not 3 because more than 1-2 actions are covered.

Completeness

Both parts are present: 'what' ("detailed breakdown of a specific cloud service's costs... to understand usage patterns and find optimization opportunities") and an explicit 'when' ("Use when you need a detailed breakdown..."). Not 5 because the 'when' clause is semi-circular (it restates the 'what' rather than naming external triggers like 'when the user asks why a service is expensive'), though the enumerated service names add specificity beyond anchor 4's typical example.

Trigger Term Quality

Strong concrete triggers: "EC2, RDS, S3, Lambda, etc." plus "costs", "breakdown", "optimization opportunities" — phrases a user would naturally say. It falls short of anchor 5 because common synonyms like "spend/spending", "analyze", or "deep dive" (the skill's own name) are missing from the description.

Distinctiveness Conflict Risk

The scope (per-service cost breakdown with named AWS services) carves a clear niche distinct from a general cloud-spend overview skill. Not 5 because it could overlap with sibling cost-analysis skills in the same plugin when a user asks broadly to 'optimize costs' without naming a service.