Conciseness

The body is uniformly lean imperative guidance ("Touch only what you must", "If you write 200 lines and it could be 50, rewrite it") with no padding and no explanation of concepts Claude already knows — every token earns its place, matching anchor 5 rather than anchor 4's minor over-explanation.

Actionability

Concrete, directly usable guidance throughout: worked task-to-goal transformations ("'Add validation' → 'Write tests for invalid inputs, then make them pass'"), a per-step plan template with verify clauses, and testable heuristics ("Every changed line should trace directly to the user's request"). For an instruction-only skill this is fully actionable, matching anchor 5.

Workflow Clarity

Section 4 explicitly defines success criteria and verification loops ("Loop until verified", plan steps with "→ verify: [check]"), but the plan format is a generic template rather than concrete validation steps, and sections 1–3 are parallel checklists rather than a sequenced workflow — anchor 4 fits better than anchor 5, and there are no destructive or batch operations that would cap the score.

Progressive Disclosure

The 65-line body is entirely self-contained with clear section headers and no bundle files, and nothing in it belongs in a separate reference file — the content is appropriately placed and easy to navigate, matching anchor 5 for a skill that needs no external references.

Specificity

"Behavioral guidelines to reduce common LLM coding mistakes" names the domain and function but offers only one generic capability statement rather than several enumerated concrete actions, matching anchor 3; it is more concrete than anchor 2's bare domain-naming but does not list the specific behaviors the skill applies to reach anchor 4.

Completeness

The description explicitly answers both what ("Behavioral guidelines to reduce common LLM coding mistakes") and when ("Use when writing, modifying, or reviewing code — implementation tasks, code changes, refactoring, bug fixes, or feature development"), and adds a negative boundary ("Do NOT use for architecture design, documentation, or non-code tasks") — an exact match for anchor 5.

Trigger Term Quality

Triggers like "writing, modifying, or reviewing code — implementation tasks, code changes, refactoring, bug fixes, or feature development" use natural user phrasing with good synonym coverage (refactoring, bug fixes, feature development), fitting anchor 4; common variations such as "debugging" or "review a PR" are missing, so it falls short of anchor 5's comprehensive coverage.

Distinctiveness Conflict Risk

The positive trigger spans essentially all code work, so it could overlap with any code-related skill (code review, refactoring, testing skills), while the "Do NOT use" clause only excludes non-code tasks — fitting anchor 3 (could still overlap with similar skills) rather than anchor 4's minor overlap risk.