Conciseness

The body is lean — tables, terse bullets, and complete rule templates with no padding — but the 'Regex Basics' section ('\s whitespace, \d digit', '+ one or more, * zero or more') explains regex fundamentals Claude already knows. That trimmable block keeps it at the 4 anchor (efficient, minor over-explanation) rather than 5; it is far from the 3 anchor's 'some unnecessary explanation' since it is only a few lines.

Actionability

Fully executable guidance throughout: a copy-paste-ready basic rule template, a complete advanced conditions example with real fields, per-event condition field lists, an operator enumeration, a runnable regex test command ('python3 -c "import re; print(re.search(...))"'), exact file naming ('.claude/hookify.{descriptive-name}.local.md'), and a minimum viable rule. Coverage matches the common cases.

Workflow Clarity

The skill is essentially a single task (author a rule) and the body provides an unambiguous format plus a validation checkpoint (the regex testing command) and pitfalls guidance. It sits at the 4 anchor rather than 5 because there is no explicit end-to-end sequence (write rule → test pattern → enable/verify) — the pieces exist but must be assembled, and rule creation is not destructive/batch so no 3-cap applies.

Progressive Disclosure

No bundle files exist, and the document is well-organized with clear sections (Rule File Format, Event Type Guide, Pattern Writing Tips, File Organization, Commands, Quick Reference) and easy navigation. It stays at 4 rather than the simple-skill 5 exception because at ~123 lines the Event Type Guide and regex material are all inlined in one file where a split could apply, though the structure itself is solid.

Specificity

Names several concrete actions — 'Create and configure hookify rules', 'match bash, file, prompt, or stop events by regex or conditions and show warn/block messages' — with concrete artifact detail (markdown files with YAML frontmatter). It falls just short of the 5 anchor because the action list (create, configure) is narrower than the multi-action exemplars, though richer than anchor 3's 1-2 actions.

Completeness

Explicitly answers both: what ('Create and configure hookify rules — markdown files with YAML frontmatter that match ... events by regex or conditions and show warn/block messages') and when ('Use when creating a hookify rule, writing hook rule syntax, configuring hookify, or adding pattern guardrails such as...'). This matches the 5 anchor with concrete trigger phrases; voice is third-person/declarative with no person-penalty.

Trigger Term Quality

The 'Use when' clause covers natural phrases users would say: 'creating a hookify rule', 'writing hook rule syntax', 'configuring hookify', 'blocking dangerous commands', '.env edits', or 'debug code', including a file-specific term (.env). Not quite the 5 anchor's comprehensive synonym coverage — a few natural variations (e.g., 'adding hooks', 'safety checks', 'guard rules') are absent.

Distinctiveness Conflict Risk

The 'hookify' niche is clearly staked with distinctive triggers (hookify rules, hook rule syntax, pattern guardrails) and no overlap with generic file/code skills. Only negligible risk of confusion with adjacent hook-related skills, which is below the 4 anchor's 'minor overlap' threshold.