Conciseness

The body is dense and earns its tokens: executable commands, a decision-guide table, a troubleshooting table, and two high-value critical rules with no padding or basic-concept tutorials. Minor trims exist — the 'Usage' bullet list largely duplicates the frontmatter triggers, and the Billing Views API-support table plus multiple billing-view examples are detail that could live in a reference file. Not 5 because of that duplication; not 3 because there is no over-explanation of concepts Claude already knows.

Actionability

Fully executable copy-paste AWS CLI commands with complete flags and JSON ('aws ce get-cost-and-usage --time-period ... --group-by Type=DIMENSION,Key=SERVICE', the create-budget JSON), exact enrollment command, concrete gotchas ('Price List API service codes differ from Cost Explorer service names'), and an error/cause/fix troubleshooting table covering the common failure cases. Not 4 because the guidance goes beyond examples to concrete behavioral rules (filter JSON, exclusive end dates, region requirements).

Workflow Clarity

The decision guide and the enumerated 7-step cost audit ('top cost drivers → month-over-month comparison → ... → report') give a clear sequence, and the two critical rules act as pre-flight checkpoints (check current date before API calls; always script numerical calculations). The troubleshooting table provides error-recovery mapping, but the body's workflows lack explicit inline validation checkpoints where intermediate results are verified before proceeding. Not 5 because checkpoints are implied (via references) rather than stated as explicit verify-then-proceed steps in the body; not 3 because sequencing is clear and error recovery is well covered.

Progressive Disclosure

The body is a genuine overview/routing document: a decision table maps each user question to a tool and a single reference file, all 16 bundle files in references/ are one level deep, every referenced path exists, and every file on disk is referenced from the body (no orphans, no missing). Deep material (per-service optimization, audit workflow, calculation patterns) is correctly split out with clearly signaled 'Read references/...' pointers. Not 4 because there are no organization gaps — navigation is trivial and nothing that belongs in a reference is monolithically inlined.

Specificity

Lists many specific concrete actions with named tools and services: 'evaluate Savings Plans and Reserved Instances, right-size EC2/Lambda/RDS/EBS with Compute Optimizer, look up service pricing, query CUR with Athena, detect cost anomalies, scope costs to billing views'. Coverage is comprehensive across the domain and uses third-person voice throughout. Not 4 because there are no meaningful gaps in capability coverage — every major AWS cost-management product is named.

Completeness

Clearly answers 'what' (the enumerated analysis/optimization/monitoring actions) and 'when' via an explicit 'Triggers on:' clause with concrete trigger phrases — the exact pattern of the anchor-5 example. Not 4 because the 'when' is not merely present but fully explicit with a concrete trigger-phrase list rather than a general 'use when' sentence.

Trigger Term Quality

An explicit trigger list covers natural user phrasings and their synonyms: 'AWS bill, cost analysis, reduce spend, savings plan, reserved instance, right-size, budget alert, cost optimization, pricing, free tier, cost anomaly, CUR, cost audit, billing view, billing view ARN'. Both casual ('reduce spend', 'AWS bill') and technical ('CUR', 'billing view ARN') registers are covered. Not 4 because essentially every common way a user would ask for this is present, including abbreviations.

Distinctiveness Conflict Risk

The niche is clear (AWS billing, CUR, billing views, Savings Plans) and most triggers are AWS-specific jargon that would not collide with other skills. However, a few bare trigger terms — 'pricing', 'free tier', 'cost optimization' — are provider-agnostic and could match requests intended for other cloud or pricing-related skills. Not 5 because that minor overlap risk is real; not 3 because the domain and the majority of triggers are distinctly AWS-flavored, far beyond 'somewhat specific'.