Conciseness

Every line carries repo-specific knowledge Claude could not know (import-time MODELING_REGISTRY population, strict SP ordering 'pad → slice → FA kwargs → slice position_ids', position_ids == 0 segment boundaries, silent YAML config breakage). There is no padding and no explanation of concepts Claude already knows, matching anchor 5's 'every token earns its place'; anchor 4 would require trimmable over-explanation, which is absent.

Actionability

Guidance is mostly executable and concrete: exact paths (veomni/data/data_collator.py, .agents/knowledge/testing.md), commands ('run pytest tests/', 'grep all YAML files first'), and a precise collator ordering rule. It falls short of anchor 5 because some direction stays at the hint level (e.g. 'grep all YAML files first' without the actual grep command) and the impact-analysis table says what to check but not how.

Workflow Clarity

The Refactoring Safety Rules section is a clear sequence with explicit validation checkpoints and a feedback loop: 'Baseline first: run pytest tests/ before any change, record results', one change per commit with 'verify tests match baseline', and 'Check baseline again at the end — results must be identical'. This matches anchor 5's explicit validation with error-recovery guidance.

Progressive Disclosure

This is a compact (~57-line) single-file skill with no bundle directories; all sections are tight and well-organized, and detail is correctly delegated one level deep to existing project files (docs/, configs/, .agents/knowledge/*.md) with a compact inline summary of the testing rules. Per the rubric's short-skill exception, well-organized sections with no need for external references warrant a 5.

Specificity

The description names the domain and lists several concrete coverage areas ("impact analysis across modalities, trainer hierarchy, data pipeline, and distributed code"), matching anchor 4's 'several specific actions; minor gaps'. It falls short of anchor 5 because the actions remain one level abstract ('checklist', 'impact analysis') rather than fully concrete operations.

Completeness

Both questions are explicitly answered: what ("VeOmni-specific checklist for feature development and refactoring. Covers impact analysis across modalities, trainer hierarchy, data pipeline, and distributed code") and when ("Use before implementing any non-trivial change" plus concrete trigger phrases). This matches anchor 5 exactly; anchor 4 would require a less explicit 'when'.

Trigger Term Quality

Explicit triggers ('add feature', 'implement', 'refactor', 'reorganize', 'new capability') are natural phrases a user would say, giving good keyword coverage. Not anchor 5 because common synonyms and variations ('change', 'modify', 'extend') are missing, leaving a few natural terms uncovered.

Distinctiveness Conflict Risk

The "VeOmni-specific" scoping plus explicit routing to sibling skills ("For model-specific or ops-specific work, use veomni-new-model or veomni-new-op instead") gives a clear niche with minimal internal conflict. It stops short of anchor 5 because the bare trigger 'implement' is broad enough to fire on general coding tasks, creating minor overlap risk with non-VeOmni skills.