Conciseness

Dense imperative lists with no teaching of concepts Claude already knows, but there is repetition across sections: stale runtime cards appear in both Gotchas ("Stale runtime cards must be refreshed or marked stale") and Anti-Patterns ("stale runtime cards … as acceptable evidence"), and projected-home-directory hook editing appears in both Execution Boundaries and Anti-Patterns. Mostly efficient with trimmable redundancy, so anchor 4 rather than 5; there is no padded or over-explained content that would justify 3.

Actionability

Includes copy-paste-ready discovery commands ("rg -n \"SessionStart|SubagentStart|…\" .codex codex hooks ."), a complete hooks.json example, and concrete validation commands ("jq empty <hooks.json>", "find <hook-dir> -type f -perm -111"). However, workflow steps 5–7 are abstract directives ("Model supported events", "define the runtime card path, task-envelope source … before implementation") and several commands use unfilled placeholders, so anchor 4 (minor gaps) rather than 5 (fully executable across common cases).

Workflow Clarity

An 8-step numbered workflow with an explicit validation step ("Validate config, script permissions, effective hook listing, and scaffold tests; fix the first failed gate before continuing"), a dedicated Validation section with exact commands, an explicit fail-fast feedback loop ("stop at first failed gate; do not proceed until it is fixed and rerun"), and a Failure Mode section with a revert-and-rerun recovery loop. This matches the top anchor: clear sequence, explicit validation, feedback loops for error recovery.

Progressive Disclosure

references/hook-examples.md and references/discovery-interview.md exist, are substantive, are one level deep, and are clearly signaled with purpose and trigger conditions ("Read references/discovery-interview.md when the request is underspecified"), and the References section names each file with its purpose. The gap: "Infrastructure/references/deferred-skill-context/agent-ops-codex-hooks-builder/" does not resolve inside the skill's bundle (references/ is the only bundled directory), so one reference is effectively dangling, keeping this at anchor 4 rather than 5.

Specificity

Five concrete, specific actions with concrete objects: "Scaffold hook packs, validate hooks.json schema, verify hook script permissions, migrate hook configuration, and troubleshoot Codex hook execution errors". Coverage spans create, audit, upgrade, validate, migrate, and troubleshoot, so it fits the 'comprehensive coverage' anchor rather than the 'minor gaps' anchor below it.

Completeness

Clearly answers both: what ("Scaffold hook packs, validate hooks.json schema, verify hook script permissions, migrate hook configuration, and troubleshoot Codex hook execution errors") and when ("Use when creating, auditing, upgrading, or validating Codex hook packs, hooks.json files, hook scripts…") with concrete trigger phrases, matching the top anchor exactly.

Trigger Term Quality

Comprehensive natural terms including file names, event names, and install paths: "Codex hook packs", "hooks.json files", "hook scripts", "SubagentStart/SubagentStop lifecycle hooks", "PreToolUse/PostToolUse/PreCompact hooks", "Stop claim checks", "repo-local/user-level .codex hook installs". A user needing this skill would naturally say these phrases.

Distinctiveness Conflict Risk

The niche is clearly Codex hook packs, but generic agent-hook terminology ("hooks.json", "PreToolUse/PostToolUse/PreCompact hooks", "Stop") overlaps with closely related hook skills (e.g., Claude Code hooks), creating minor wrong-skill trigger risk. It is mostly distinct rather than having a fully clear niche, so anchor 4 fits better than 5; it is far too pinned to Codex to fall to 3.