Conciseness

The body is ~545 lines with a conceptual 'What is Path Traversal' intro explaining a concept Claude already knows, and the mitigation guidance (realpath/basename/allowlist) is re-explained three times — in 'Patterns That Prevent', Phase 2 'Check B', and 'Important Reminders'. It is not 2 because the bulk is genuinely actionable reference material rather than generic padding, and not 4 because the repetition and conceptual intro could clearly be tightened.

Actionability

Provides fully executable guidance: copy-paste subagent prompts, exact markdown output templates, concrete batching procedures, and runnable vulnerable/secure code examples across Python, Node, PHP, Ruby, Java, Go, and C#. It is not 4 because examples cover the common cases comprehensively rather than having minor gaps.

Workflow Clarity

Three phases are clearly sequenced with an explicit validation gate after Phase 1 ('If the recon found zero file-loading sinks ... skip Phase 2 and Phase 3 entirely') and stated phase dependencies plus cleanup. It is not 5 because there is no findings-quality feedback loop or completeness check that all sinks were batched before merge, and not 3 because a real validation checkpoint exists rather than validation being absent.

Progressive Disclosure

No bundle/reference files exist and all content is inlined into one 545-line SKILL.md, including per-language code examples and sink function lists that read as reference material belonging in separate files. It is not 4 because the file is reference-heavy with nothing split out, and not 2 because section structure is clear and navigable rather than minimal.

Specificity

Lists multiple concrete actions across the three phases — 'recon (find file-loading sinks with dynamic paths)', 'batched verify (trace user input and mitigations in parallel subagents, 3 sinks each)', and 'merge (consolidate batch results)' — giving comprehensive coverage of what the skill does. It is not a 4 because coverage is broad and specific rather than having only minor gaps.

Completeness

Explicitly answers both: the 'what' ('Detect path traversal vulnerabilities ... using a three-phase approach') and the 'when' ('Use when asked to find path traversal, directory traversal, or file disclosure bugs') with concrete trigger phrases. It is not 4 because the 'when' is fully explicit rather than only somewhat specific.

Trigger Term Quality

Includes natural trigger phrases users would say — 'path traversal, directory traversal, or file disclosure bugs' — with synonyms, but a few natural variants (e.g., 'file inclusion', 'dotdot slash', 'symlink escape') are absent. It is not 5 because coverage is good rather than comprehensive, and not 3 because synonyms and natural phrasing are clearly present.

Distinctiveness Conflict Risk

Occupies a clear niche (path traversal detection) with distinct triggers and an explicit boundary note ('Requires sast/architecture.md (run sast-analysis first)') that disambiguates it from sibling SAST skills. It is not 4 because conflict risk is minimal, not merely reduced.