Conciseness

The body is mostly tight, expert-level guidance (Go/HCL snippets, exact commands, file layouts) with no hand-holding, but several sections pad it: the five 'Common Action Patterns' subsections are generic bullet lists ("Invoke service with parameters / Wait for completion / Return output / Handle service-specific errors"), and the Schema Validation Checklist duplicates items restated nearly verbatim in the Pre-Submission Checklist ('All List/Map attributes have ElementType', compile checks). This fits anchor 3 ('Mostly efficient but includes some unnecessary explanation or could be tightened'); it is leaner than anchor 2's padded style but has more than the 'minor instances' required for anchor 4.

Actionability

Largely copy-paste-ready guidance: a complete schema snippet, a full ticker-based polling loop with progress throttling, concrete test harness code with 'go test -c -o /dev/null' compile checks, exact HCL trigger syntax, changelog format, and real reference implementations (terraform-provider-tfe's action_query_run.go). Minor gaps keep it below anchor 5: the Invoke example leaves the core logic as comments ('// Implement action logic with error handling'), and both the StateChecks and PostApplyFunc test hooks are empty stubs — so anchor 4 ('Mostly executable guidance; concrete code or commands with minor gaps') is the best fit, well above anchor 3's pseudocode level.

Workflow Clarity

The lifecycle is sequenced logically — numbered one-time setup steps (ProviderWithActions, ActionData, ActionWithConfigure), then schema, invoke, testing, documentation, changelog, and an explicit 11-item Pre-Submission Checklist as a final validation gate, plus compile-first test instructions ('go build', 'go test -c -o /dev/null' before running). Not a 5 because validation checkpoints are scattered and partly optional ('terrafmt diff' marked optional, PostApplyFunc stub unexplained) and the overall order is implied by section arrangement rather than stated as an explicit procedure — matching anchor 4 ('Clear sequence with most checkpoints present; minor validation gaps'), comfortably above anchor 3's missing/implicit checkpoints.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), so everything is inline in one ~500-line SKILL.md. Structure is nonetheless good: clear two-level sections, consistently degradable external pointers ('use the provider-test-patterns skill (if available)', tfplugindocs/provider-docs skill), one-level-deep external links, and per-repo adaptation notes. It falls short of anchor 5 (which would split bulk detail into well-signaled reference files) because testing patterns and documentation standards are sizable inline sections that could live in separate files, but is clearly above anchor 3's 'content that should be separate is inline' with buried references — the cross-skill references are explicitly signaled and the inline content is well navigable, matching anchor 4.

Specificity

"Implement Terraform Provider actions using the Plugin Framework" names the domain and one concrete action (implementing actions) with a precise qualifier ("imperative operations that execute at lifecycle events"), but does not enumerate several distinct capabilities (schema definition, invoke logic, testing, docs are not mentioned). This matches the anchor 'Names domain and 1-2 concrete actions, but not comprehensive'; the anchor at 4 requires several listed specific actions, which is not met, and the anchor at 2 ('Processes PDF files') is clearly less informative than this description.

Completeness

The 'what' is explicit ("Implement Terraform Provider actions using the Plugin Framework") and the 'when' is explicit ("Use when developing imperative operations that execute at lifecycle events (before/after create, update, destroy)"). However, the when-clause is a technical condition rather than a natural user trigger phrase (compare anchor 5's "or when the user mentions PDFs, forms, or document extraction"), and it lacks simpler user-side phrasings — fitting anchor 4 ('Has both what and when; when could be more explicit or specific') rather than 5, and well above anchor 3 ('when is missing or only weakly implied').

Trigger Term Quality

Natural keywords a user would say are present: "Terraform", "Provider actions", "Plugin Framework", "lifecycle events", "before/after create, update, destroy", "imperative operations". A few natural phrasings are missing (e.g. "action block", "action_trigger", "adding an action to a provider"), which fits anchor 4 ('Good keyword coverage; a few natural terms missing') rather than 5's comprehensive synonym/extension coverage, and clearly above 3's 'missing common variations'.

Distinctiveness Conflict Risk

"Terraform Provider actions" with "Plugin Framework" and lifecycle-event qualifiers carve out a clear niche with minimal overlap; only a closely related generic Terraform-provider-development skill could conceivably compete. This matches anchor 5 ('Clear niche with distinct triggers; minimal conflict risk'); anchor 4's 'minor overlap risk with closely related skills' is not a better fit because the 'actions' trigger term is itself the distinguishing feature.