Conciseness

The body is mostly efficient (command + 'Extract:' bullet pairs, dense error table), but the crt.sh JSON pipeline is repeated three times (Quick Reference, §4, §6) and subfinder/amass/httpx/dig commands are duplicated verbatim between the Quick Reference and their dedicated sections — fitting the anchor 'Mostly efficient but includes some unnecessary explanation or could be tightened' rather than the 'minor instances' of anchor 4.

Actionability

Fully executable, copy-paste-ready commands with real flags throughout ('subfinder -d <TARGET> -o subdomains.txt', 'httpx -l subdomains.txt -sc -title -tech-detect', 'amass enum -passive -d example.com'), plus a working wildcard-detection bash snippet and an error table with concrete fixes — matching the anchor 'Fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

§10 gives a 9-step sequenced workflow with validation checkpoints (deduplicate & wildcard-filter at step 4, live-host validation at step 5), §9 supplies error-recovery feedback ('crt.sh timeout → Wait 30s and retry', 'WHOIS blocked → Try alternative WHOIS server'), and §11 is an explicit go/no-go checklist gate before active probing — matching the anchor 'Clear sequence with explicit validation steps; feedback loops for error recovery; checklists for complex processes'.

Progressive Disclosure

Both bundle files are real, one level deep, and clearly signaled with purpose and usage ('references/dns-techniques.md — ... Read when you need detailed technique reference beyond this skill's quick-reference commands'; scripts/parse_subdomains.py with a usage line). It sits at anchor 4 ('most content is appropriately placed; minor organization gaps') rather than 5 because §2 (DNS records) and §7 (passive DNS sources) overlap the reference file's territory, keeping some split-worthy detail inline in an already ~300-line body.

Specificity

The description lists several concrete capabilities — 'DNS, WHOIS, subdomain enumeration, Certificate Transparency, technology fingerprinting, ASN mapping' — matching the anchor 'Lists several specific actions; minor gaps in coverage'. It is not a 5 because the lead phrase 'Passive intelligence gathering' is abstract and 'DNS, WHOIS' name objects rather than actions; not a 3 because it goes well beyond 1-2 concrete actions.

Completeness

The 'what' is clear ('Passive intelligence gathering without touching the target — DNS, WHOIS, ...') but the description contains no 'Use when...' clause, matching the anchor 'Has a clear what but when is missing or only weakly implied'. Per the rubric guideline, a missing 'Use when...' clause caps completeness at 3; the when_to_use guidance lives in a metadata field outside the description that skill-selection systems do not read, so it does not lift the score to 4.

Trigger Term Quality

Natural trigger terms are present ('DNS', 'WHOIS', 'subdomain enumeration', 'Certificate Transparency'), fitting the anchor 'Good keyword coverage; a few natural terms missing'. Common phrasings users would actually say — 'passive recon', 'recon', 'subfinder', 'crt.sh' — appear only in the separate metadata.when_to_use field, not in the description, keeping it below the comprehensive anchor 5.

Distinctiveness Conflict Risk

'Passive intelligence gathering without touching the target' carves a clear passive-vs-active niche with distinct triggers (DNS, WHOIS, CT logs), fitting the anchor 'Mostly distinct; minor overlap risk with closely related skills'. The risk is not lower than 4 because terms like 'intelligence gathering' and 'technology fingerprinting' could overlap with an active-recon or OSINT sibling skill.