Conciseness

The ~710-line body duplicates itself: the 'Plugin Hook Configuration' section restates (and contradicts) the earlier 'Plugin hooks.json Format' wrapper rule, and the 'Quick Reference' events table plus 'Best Practices' DO/DON'T lists restate the per-event sections and scattered best-practice bullets. Several padded sections ('Benefits:', 'Use for:') add little; this matches 'noticeably verbose; several unnecessary explanations or padded sections' rather than the mostly-efficient anchor 3.

Actionability

Guidance is largely copy-paste ready — full hooks.json configs, a bash validation script with `set -euo pipefail` and jq field extraction, and test commands like `echo '{"tool_name": "Write", ...}' | bash ${CLAUDE_PLUGIN_ROOT}/scripts/validate.sh`. Not a 5 because the second plugin-format example is inconsistent with the documented wrapper format, and referenced working examples ('examples/validate-write.sh', 'examples/load-context.sh') do not exist in the bundle.

Workflow Clarity

The 'Implementation Workflow' gives a clear 9-step sequence with explicit checkpoints ('Validate configuration with scripts/validate-hook-schema.sh', 'Test hooks with scripts/test-hook.sh', 'Test in Claude Code with claude --debug'). It falls short of anchor 5 because there is no explicit error-recovery loop (what to do when validation fails or a hook misbehaves beyond 'look for' debug logs).

Progressive Disclosure

References are one level deep and real for `references/patterns.md`, `references/migration.md`, `references/advanced.md` and the `scripts/` utilities, but the body also cites a nonexistent `examples/` directory twice, and event-by-event API detail (full config/output/input formats per event) is inlined in SKILL.md where it belongs in a reference file. This sits between anchor 3 ('content that should be separate is inline', 'references present but not clearly signaled' — here references are signaled but one target is missing) and anchor 4.

Specificity

The capability statement is generic — 'Provides comprehensive guidance for creating and implementing Claude Code plugin hooks with focus on advanced prompt-based hooks API' names the domain and one or two actions but lists no concrete distinct capabilities (compare anchor 5's 'extract text, fill forms, merge documents'). Concrete actions like 'validate tool use' and 'block dangerous commands' appear only as trigger quotes, not as capability descriptions, so this matches anchor 3 rather than 4.

Completeness

Both parts are present and explicit: 'when' via 'This skill should be used when the user asks to...' with concrete trigger phrases, and 'what' via 'Provides comprehensive guidance for creating and implementing Claude Code plugin hooks'. It stops short of anchor 5 because the 'what' is vague — 'comprehensive guidance' does not state what the skill actually enables the user to build or do.

Trigger Term Quality

Coverage is comprehensive and natural: 'create a hook', 'add a PreToolUse/PostToolUse/Stop hook', 'validate tool use', 'implement prompt-based hooks', 'set up event-driven automation', 'block dangerous commands', plus a full enumeration of all nine hook event names. These are exactly the phrases a user would say, matching the comprehensive-synonyms anchor 5 rather than the few-terms-missing anchor 4.

Distinctiveness Conflict Risk

The description occupies a clear niche (Claude Code plugin hooks) with distinct triggers — the event names (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification) and 'use ${CLAUDE_PLUGIN_ROOT}' are unambiguous hook-specific terms with minimal overlap risk against other skills.