The skill is lean and efficient, using bullet points and structured formatting without explaining concepts Claude already knows. Every section serves a clear purpose with no padding or unnecessary context.

Provides concrete, executable guidance with specific format examples, checkpoint dialogue samples, and clear file:line reference conventions. The three-level workflow is fully specified with copy-paste ready templates.

The multi-step teaching workflow is clearly sequenced (Level 1 → Checkpoint → Level 2 → Checkpoint → Level 3 → Exit) with explicit validation checkpoints after each level and clear exit conditions.

Excellent structure with a quick reference at top, main content appropriately scoped, and clear one-level-deep references to supporting files (trigger-reference.md, examples.md, visualization-guide.md) for detailed content.

Lists multiple specific concrete actions: 'Progressive concept teaching through three depth levels', 'Creates diagrams', 'provides annotated code walkthroughs', 'builds explanations from fundamentals to production internals'. Clear methodology with named levels (Core → Mechanics → Deep Dive).

Explicitly answers both what (progressive teaching with diagrams, code walkthroughs, three depth levels) AND when ('Use when: user requests multi-level learning about code patterns, architecture, or implementation mechanics'). Also includes helpful 'Not for' clause to clarify boundaries.

Excellent coverage of natural trigger phrases users would say: 'teach me about', 'how does X work', 'walk me through', 'tutorial on', 'deep dive into', 'help me understand'. These are realistic user phrasings with good variation.

Clear niche with distinct methodology (three-level progression, checkpoint-based). The 'Not for' clause explicitly distinguishes from standard code assistance, reducing conflict risk with general coding skills.