Conciseness

The skill is fairly comprehensive but includes some unnecessary verbosity. Comments like '// Called once on app startup' and '// Start drag, capture, etc.' are filler. The Hit Testing section covers many variants that could be trimmed. However, most content is domain-specific patterns Claude wouldn't inherently know, so the bulk is justified.

Actionability

Excellent actionability with fully executable Rust code examples covering all major patterns: defining actions, emitting them, handling them in App, hit testing, keyboard events, signal events, and action chaining. The code is copy-paste ready with realistic types and method calls drawn from real codebases.

Workflow Clarity

The skill clearly sequences the action lifecycle: define action enum → emit from widget → handle in App. The distinction between widget actions, posted actions, and global actions is well-structured with different handling patterns. Minor gap: no explicit validation/error handling workflow for when actions fail or are miscast, though this isn't a destructive operation so the cap at 3 rule doesn't apply.

Progressive Disclosure

The Reference Files section lists supporting files (references/action-patterns.md, references/event-handling.md, references/moly-action-patterns.md) with clear descriptions, but no bundle files were provided to verify they exist. The main file is quite long (~250+ lines) and some sections like the full Hit Testing enumeration and Keyboard Events could be moved to reference files. The Moly-specific patterns bullet list in the references section hints at content that should be in the main file or clearly navigable.

Specificity

Names the domain (Robius event and action patterns) but provides no concrete actions—only lists trigger terms and pattern names without explaining what the skill actually does (e.g., 'generates event handlers', 'creates action dispatchers').

Completeness

The 'when' is explicitly addressed via the trigger list, but the 'what' is extremely vague—'Robius event and action patterns' doesn't explain what the skill actually produces or does. The description lacks a clear statement of capabilities.

Trigger Term Quality

Includes a good set of natural and technical trigger terms (MatchEvent, post_action, cx.widget_action, handle_actions, widget action, event handling) plus multilingual variants (事件处理, 自定义动作). Missing some broader synonyms like 'callback', 'listener', or 'signal' that users might naturally say.

Distinctiveness Conflict Risk

The Robius-specific API names (cx.widget_action, MatchEvent, DefaultNone) make it fairly distinct and unlikely to conflict with generic event handling skills. Minor overlap risk with general Rust or UI event handling skills.