Conciseness

The BAD/GOOD contrast pairs and red-flags table earn their tokens, but substantial space re-explains concepts Claude already knows — Ousterhout's three complexity symptoms, KISS, single responsibility, rule of three — and the ASCII module diagram plus two overlapping checklists could be tightened. Mostly efficient but padded in the conceptual exposition, matching anchor 3 rather than 4.

Actionability

Mostly executable guidance: concrete BAD/GOOD code pairs for deep modules, NewType, discriminated unions, error design, and semantic whitespace parsing, plus a grep-able red-flags table. Falls short of 5 because several exemplars ('load_task', 'list_active_tasks', 'iter_active_tasks', 'FormatterRegistry') are '...' skeletons/pseudocode without explicit justification, which the guidelines penalize.

Workflow Clarity

The type-first development section gives a clear 4-step sequence (define shapes, signatures, implement, validate at boundaries) and the before-writing/during-review checklists act as process checkpoints. Not 5 because there are no explicit validation commands or feedback loops (e.g., 'run mypy' after step 3), leaving checkpoints implicit rather than executable.

Progressive Disclosure

A single ~450-line file with no references/ or scripts/ bundle; sections are clearly headed and navigable, but the detailed per-principle examples and the red-flags quick reference are exactly the material that belongs in one-level-deep reference files, with SKILL.md as an overview. Good inline structure, but content that should be separate is inline — matching anchor 3 rather than 4, which assumes appropriate placement or mostly-clear references.

Specificity

The description lists multiple specific concrete capabilities — 'type-first development, deep modules, complexity management, and red flags' — and concrete activities ('reading, writing, reviewing, or refactoring Python files', 'planning module structure', 'deciding where to put new code') with comprehensive coverage of its design niche. Not score 4 because coverage is broad and specific rather than having minor gaps; not below because nothing is vague fluff.

Completeness

It clearly answers both: 'what' ('Python design patterns for CLI scripts and utilities — type-first development, deep modules, complexity management, and red flags') and an explicit 'when' with concrete trigger phrases ('Use when reading, writing, reviewing, or refactoring Python files... Also activate when planning module structure, deciding where to put new code, or doing code review'). This matches the anchor-5 example structure exactly.

Trigger Term Quality

Good keyword coverage with natural user phrases like 'refactoring Python files', 'code review', 'module structure', and 'deciding where to put new code', plus the concrete path '.trellis/scripts/'. A few natural terms are missing (e.g., '.py' extension, 'type hints', 'design review', 'messy script'), so it falls short of the comprehensive-with-synonyms anchor 5.

Distinctiveness Conflict Risk

The design-guidance niche (deep modules, type-first development for CLI scripts) is distinguishable, but the trigger 'reading, writing... Python files' is broad enough to activate on virtually any Python task, creating real overlap risk with general Python, refactoring, and code-review skills. Not 4 because the over-trigger surface is more than 'minor overlap with closely related skills'; not 2 because the technique vocabulary and .trellis/scripts context do anchor it to a specific niche.