Conciseness

The ~60-line body is lean and assumes competence: no concept explanations, just routing ("Choose the smallest applicable reference set"), hard constraints ("`to: end` is the virtual sink", "`done` is framework-injected"), and baseline facts ("Modules communicate by mutating and returning the shared `conversation_list` carrier"). Every section earns its tokens, matching anchor 5's "every token earns its place"; there is no padded explanation that would justify 4.

Actionability

The routing table is concrete (task → specific file paths) and "Use live `fake_model`, Janus, and Qwen modules as implementation maps" names real targets, but the guidance breaks where it matters: 3 of 8 routing rows point to files absent from the bundle — "the matching `templates/*.yaml`", "`templates/base.template.yaml`, `templates/modules_train.template.yaml`", "`templates/modules_infer_eager.template.yaml`, `templates/modules_infer_fsdp.template.yaml`" — and the first row cites `.agents/knowledge/veomni-seed-omni.md`, which also does not exist here. Following the instructions for graph/config tasks dead-ends, which is the anchor-3 pattern of concrete-but-incomplete guidance rather than anchor 4's "minor gaps".

Workflow Clarity

"First Checks" gives a clear numbered sequence (confirm the task touches SeedOmni via listed paths → treat live code as source of truth → pick the smallest reference set → use live modules as maps) before routing. Validation is present only as a routing row ("Validate a SeedOmni change | `references/validation.md`") rather than sequenced as an explicit post-change checkpoint, which is the minor validation gap of anchor 4 rather than the absent-checkpoint pattern of anchor 3 — the operations are routed to reference files rather than executed inline, so no destructive/batch cap applies.

Progressive Disclosure

The structure is the right shape — a short overview with a well-signaled routing table pointing one level deep to 7 real, content-bearing `references/*.md` files — but scored against the actual bundle, the paths `templates/*.yaml` (four files) and `.agents/knowledge/veomni-seed-omni.md` referenced by the routing table do not exist in the skill directory. Navigation breaks for those rows, which is more than the "minor organization gaps" of anchor 4; if those targets exist only in the target repository, the paths should be made resolvable (or the files bundled) to reach anchor 4-5.

Specificity

The description enumerates multiple concrete, verbed actions rather than abstract scope: "adding or modifying `veomni/models/seed_omni/`", "CPU preprocessors", "SeedOmni split-checkpoint scripts", "configure per-module FSDP2/DDP/emb/ep", "debug SeedOmni train/infer graph behavior". Coverage spans modules, mixins, data flow, graphs, checkpoints, parallelism, inference, and validation — comprehensive for the domain, matching the anchor-5 example's action density; the only soft spot is the generic opening phrase "SeedOmni development guidance", which is backstopped by the concrete enumerations, not enough to drop to 4.

Completeness

It explicitly answers both questions: "what" via "SeedOmni development guidance for Open-VeOmni" plus the enumerated scope, and "when" via an explicit "Use when..." clause followed by a second concrete "Triggers include:" list. This mirrors the anchor-5 good example (capability statement + explicit trigger phrases), so it is not the anchor-4 case where the 'when' could be more explicit — here 'when' is stated twice with concrete conditions.

Trigger Term Quality

Both the "Use when..." and "Triggers include:" lists supply the natural vocabulary a developer in this codebase would actually type: "new OmniModule", "wire graph", "update `training_graph` or `generation_graph`", "split SeedOmni checkpoint", "add Preprocessor", "change conversation_list flow", "debug SeedOmni train/infer". Synonym variants ("OmniModule"/"Omni modules", "Preprocessor"/"CPU preprocessors", "train/infer graph"/"graph YAML") and file paths/extensions (`veomni/models/seed_omni/`) are present, matching anchor 5's requirement of synonyms plus extensions; nothing natural is obviously missing.

Distinctiveness Conflict Risk

The niche is unambiguous — every trigger is namespaced to SeedOmni/Omni/`seed_omni` within Open-VeOmni (e.g., "SeedOmni split-checkpoint scripts", "per-module accelerators", "distributed/eager Omni inference"), so overlap with generic modeling or data skills is minimal. Per the anti-drift check, anchor 4 ("minor overlap risk with closely related skills") does not fit better: sibling skills like `veomni-new-model` are explicitly separated by the SeedOmni-specific triggers, and none of these phrases would plausibly fire a different skill.