Conciseness

The core instructions are tight, but the body opens with two near-identical authorization warnings ("⚠️ AUTHORIZED USE ONLY" block followed by another "AUTHORIZED USE ONLY: Use this skill only for authorized security assessments..." quote) and the "Use this skill when" bullets restate the frontmatter description almost verbatim. This is more than the "minor instances of over-explanation" of anchor 4, fitting anchor 3's "includes some unnecessary explanation or could be tightened".

Actionability

The instructions give real method substance — "Decompose into sub-goals with AND/OR structure", "Annotate leaves with cost, skill, time, and detectability" — but no worked example, notation sample, or template showing what a produced attack tree looks like, so execution details are left to inference. That lands between anchor 2 ("high-level hints") and anchor 4 ("mostly executable guidance"), at anchor 3's "some concrete guidance but incomplete"; for an instruction-only skill the guidance is specific but not copy-paste actionable.

Workflow Clarity

The instruction bullets imply a sequence (confirm scope → decompose → annotate → map mitigations) and the confirmation gate is an explicit checkpoint for any probing commands, but there are no checkpoints on the construction itself — nothing about validating the tree against scope, reviewing with the stakeholder, or what to do when the model is incomplete. Anchor 3 ("steps listed but validation gaps; sequence present but checkpoints missing or implicit") fits; the operation is not destructive or batch, so no cap applies, but anchor 4's "most checkpoints present" is not met.

Progressive Disclosure

The body is cleanly sectioned (Use when / Do not use / Instructions / Safety / Resources / Limitations) and the reference is clearly signaled in both Instructions and a Resources section, but the referenced file `resources/implementation-playbook.md` does not exist in the bundle — there is no `resources/` directory at all — so the one-level-deep disclosure chain is broken. This is below anchor 4 ("references mostly clear" and functional) and matches anchor 3: structure present, but the reference does not resolve.

Specificity

"Build comprehensive attack trees to visualize threat paths" names the domain and two concrete actions (build, visualize), but stops there — it omits the decomposition, annotation, and mitigation-mapping work the body actually covers. This matches anchor 3 ("names domain and 1-2 concrete actions, but not comprehensive") rather than anchor 4, which expects a list of several specific actions with only minor gaps.

Completeness

It explicitly answers both: what ("Build comprehensive attack trees to visualize threat paths") and when ("Use when mapping attack scenarios, identifying defense gaps, or communicating security risks to stakeholders") with concrete trigger phrases. This matches anchor 5; anchor 4 would require the 'when' clause to be less explicit or specific, which it is not.

Trigger Term Quality

"mapping attack scenarios, identifying defense gaps, or communicating security risks to stakeholders" gives good natural keyword coverage ("attack scenarios", "defense gaps", "security risks", "stakeholders"), but misses common variations a user would say such as "threat modeling", "threat analysis", or "risk assessment". Anchor 4 ("good keyword coverage; a few natural terms missing") fits better than 3, since several natural phrases are present, and better than 5, since synonyms are absent.

Distinctiveness Conflict Risk

Attack-tree/threat-path construction is a clear niche with distinct triggers ("attack trees", "attack scenarios", "defense gaps") that no generic skill would claim, matching anchor 5's "clear niche with distinct triggers; minimal conflict risk". It is far more differentiated than anchor 4's "minor overlap risk with closely related skills".