Conciseness

The body is information-dense and free of concept explanations, assuming Claude's competence throughout. Guardrail rules repeat across steps ("neither read nor replace the shared cache" in step 1 vs. "does not publish it to that shared cache" in step 5; supplied-model preservation in steps 1 and 4), matching anchor 4's minor trimmable instances; there is no padding, so it is well above anchor 3.

Actionability

Concrete, executable guidance throughout: exact reference paths, the exact return payload `{ "format": "markdown", "content": "<exact model text>" }`, artifact filenames (threatmodel.md, <scan_dir>/threatmodel.md), and footer fields (Repository, Version). Below anchor 5 because the core generation procedure and storage mechanics are delegated to external references absent from this bundle; above anchor 3 since what is written is specific, not pseudocode.

Workflow Clarity

Five clearly ordered steps with explicit checkpoints (ask when a required input is missing; cache match on Repository/Version lines; step 5's checks for scope, actual runtime boundaries, source evidence, and separation of hypotheses from findings). Below anchor 5 because there is no remediation loop if step 5's checks fail and the long compound-condition sentences in steps 1-2 obscure the mainline sequence; validation is present, so above anchor 3.

Progressive Disclosure

A lean overview delegating storage policy, artifact schema, security guidance, and model generation to four one-level-deep references, each signaled at its point of need. Below anchor 5 because the referenced files sit outside the skill directory (../../references/) and are absent from the bundle so cannot be verified, and the dense conditional logic in steps 1-2 is inline content that could itself live in a reference; above anchor 3 because the split is appropriate and references are clearly signaled.

Specificity

The description names the domain and concrete actions ("asks to create, update, or persist a repository threat model") but only inside trigger phrasing, never stating what the skill actually does with the model. This matches anchor 3 (domain plus 1-2 concrete actions, not comprehensive); it is not 4 because no distinct capability actions are listed, and not 2 because the named actions are concrete and domain-specific.

Completeness

The "when" is explicit and thorough — three positive triggers plus the negative "Do not use as the primary trigger for full PR, commit, branch, patch, or repository scans" — but the "what" is only implied through the trigger clause rather than stated as a capability. Below anchor 5 (requires both explicit); above anchor 3, whose weakness is the inverse (clear what, weak when).

Trigger Term Quality

Natural user terms are present ("threat model", "threat-modeling", "security scan", "$threat-model") alongside routing terms (PR, commit, branch, patch, repository scans). A few natural synonyms (e.g., "attack model", "security analysis") are missing, so it falls short of anchor 5's comprehensive synonym coverage but exceeds anchor 3's missing common variations.

Distinctiveness Conflict Risk

A clear niche (threat-model phase within security scanning) with distinct triggers, a named invocation ($threat-model), and an explicit negative trigger separating it from full scan skills — minimal conflict risk, matching anchor 5.