Conciseness

Largely lean, directive bullet guidance with no padding of concepts Claude already knows, but assets are enumerated twice — step 2 'List assets that drive risk (data, credentials, models, config, compute resources, audit logs)' and step 3 'List the assets that drive risk (credentials, PII, integrity-critical state...)' — and the intro ends with a sentence fragment; these minor redundancies keep it below the 5 anchor's 'every token earns its place'.

Actionability

Concrete, executable instruction-style guidance: specific control types ('authZ checks, input validation, schema enforcement, sandboxing, rate limits, secrets isolation, audit logging'), a good-vs-generic example ('enforce schema at gateway for upload payloads' vs 'validate inputs'), and an exact output filename pattern ('<repo-or-dir-name>-threat-model.md'); it falls short of fully copy-paste-ready because no example threat entry is shown inline — the output shape lives entirely in references/prompt-template.md.

Workflow Clarity

An 8-step numbered workflow with an explicit user-validation feedback loop ('Pause and wait for user feedback before producing the final report', with a fallback when the user declines) and a pre-finalize quality checklist (step 8 confirms entrypoint coverage, boundary representation, runtime/CI separation, and assumption explicitness) — matching the 5 anchor's sequence, validation steps, feedback loops, and checklist.

Progressive Disclosure

The body is a concise overview that clearly signals exactly two one-level-deep references with stated purposes ('Output contract and full prompt template: references/prompt-template.md', 'Optional controls/asset list: references/security-controls-and-assets.md'), both of which exist as real files, plus the instruction 'Only load the reference files you need' — matching the 5 anchor's clear overview with well-signaled references and easy navigation.

Specificity

Lists multiple specific concrete actions — 'enumerates trust boundaries, assets, attacker capabilities, abuse paths, and mitigations, and writes a concise Markdown threat model' — with comprehensive coverage and no gaps; the 4 anchor requires minor coverage gaps, which are absent.

Completeness

Explicitly answers both what (repository-grounded threat modeling producing a Markdown threat model) and when ('Use when the user asks to threat model a codebase or path...') with concrete trigger phrases, matching the 5 anchor; the 4 anchor requires a 'when' that could be more specific, which is not the case.

Trigger Term Quality

Good natural-phrase coverage ('threat model a codebase or path', 'enumerate threats or abuse paths', 'AppSec threat modeling'), but a few common synonyms users would say are missing (e.g., 'attack surface', 'STRIDE', 'security architecture review'); the 5 anchor demands comprehensive synonym coverage.

Distinctiveness Conflict Risk

Clear niche with distinct triggers and explicit negative triggers ('Do NOT use for general architecture summaries, code review, security best practices (use security-best-practices), or non-security design work') that minimize conflict risk with adjacent skills; the 4 anchor's 'minor overlap risk' is not present given the explicit disambiguation.