The body is lean — quick start, a routing decision tree, compact code, and a script table — and never explains concepts Claude already knows (e.g., what draw.io is); every section is functional, matching the 'lean and efficient; assumes competence' anchor. Not score 2 because there is no unnecessary explanation, though the inline shape-library list and a slight overlap between Key Concepts code and helper scripts keep it from being exemplary.

Provides fully executable, copy-paste-ready guidance throughout — 'uv run scripts/create_flowchart.py steps.json /mnt/user-data/outputs/flow.drawio', complete drawpyo Object/Edge/styling snippets, and a script table with exact usage — matching the 'fully executable code/commands' anchor; not score 2 because code is complete, not pseudocode.

The Decision Tree provides a clear sequenced routing by diagram type and the Output section gives a concrete final step, but there is no validation/verification checkpoint (e.g., confirming the generated .drawio opens/renders) for this batch file-generation operation, matching the 'steps listed but validation gaps' anchor. Not score 3 because the feedback-loop guideline for batch operations calls for an explicit verify step; not score 1 because the sequence and output handling are clearly present.

SKILL.md is a clear overview with well-signaled, one-level-deep references ('references/REFERENCE.md: Complete API documentation', 'references/examples.md', 'scripts/'), all of which resolve to real files, and content is appropriately split — matching the 'clear overview with well-signaled one-level-deep references' anchor. Not score 2 because references are explicitly signaled, not buried.

Lists multiple concrete actions — 'Generate draw.io diagrams programmatically using Python', 'Creates flowcharts, architecture diagrams, tree structures, network diagrams' — matching the 'lists multiple specific concrete actions' anchor; not score 2 because it goes well beyond naming a domain plus a few actions.

Explicitly answers both what ('Generate... Creates flowcharts, architecture diagrams...') and when ('Use when the user requests a .drawio file, diagram, flowchart, or visual documentation'), matching the 'clearly answers both what AND when with explicit triggers' anchor; not score 2 because the 'when' is explicit, not merely implied.

Covers natural user vocabulary — '.drawio file', 'diagram', 'flowchart', 'visual documentation' — terms a user would actually say; not score 2 because common variations are present rather than missing.

Targets a distinct, specific niche (draw.io / .drawio file generation) with dedicated triggers, making it unlikely to fire for an unrelated skill; not score 2 because the niche and triggers are clearly demarcated.