Conciseness

The ~30-line body is lean and assumes full Lit/TanStack competence — every line is a directive such as "Construct one `TableController<typeof features, TData>(this)` as a stable host field", with no concept explanations or padding. Not 4: the enumeration of what the core skill owns ("feature registration, row-model slots, state/reset changes...") is scope delineation preventing duplicated work, not over-explanation that could be trimmed.

Actionability

Concrete API signatures throughout ("`controller.table(options, selector?)`", "`FlexRender({ cell })`", "`table.subscribe`"), an executable command ("intent load @tanstack/table-core#migrate-v8-to-v9"), and exact declaration file paths for API discovery. Not 5: a couple of items are directional in the body alone — "Feed resolved controlled callbacks back through reactive Lit properties, or use stable external atoms" — with the concrete v8-to-v9 mapping tables deferred to the reference file. Not 3: the guidance is concrete and executable, not pseudocode or high-level hints.

Workflow Clarity

The sequence is explicit — load the core skill "first and audit its entire shared checklist", then framework prerequisites, the Lit checklist, "Apply the affected mappings", ending in a validation checklist ("The framework checklist above passes with the current adapter declarations"). Not 5: there is no error-recovery feedback loop (what to do when a final check fails) and intermediate checkpoints are implicit. Not 3: sequence and a validation checklist are present with only minor gaps.

Progressive Disclosure

Good structure: a short overview body keeps the checklist while detailed v8-to-v9 mappings are split into references/adapter-migration.md, which exists, is one level deep, and is clearly signaled with purpose ("Read [adapter-migration](references/adapter-migration.md) when changing construction, rendering, state, or app hooks"). Not 5: sibling-skill links in the body and reference ("../getting-started/SKILL.md", "../table-state/SKILL.md", "../../getting-started/references/create-table-hook.md") do not resolve within this bundle and add a second hop, so navigation depends on the surrounding skill tree.

Specificity

"Migrate lit Table v8 to v9" plus "Audit framework construction, rendering, state, and app hooks" names the domain and several concrete audit areas. Not 5: the actual shared API changes are delegated to "the core migration skill", so coverage of concrete actions has minor gaps. Not 3: this is well beyond 1-2 concrete actions.

Completeness

The 'what' is clear ("Migrate lit Table v8 to v9. Audit framework construction, rendering, state, and app hooks") but there is no 'when' — no "Use when..." clause or equivalent explicit trigger guidance, which the rubric guideline caps at 3. Fits anchor 3 exactly.

Trigger Term Quality

"Migrate lit Table v8 to v9" is a phrase a user would naturally say, with supporting terms "v8", "v9", "state", "rendering", "app hooks". Not 5: misses the primary library names users actually say — "TanStack", "lit-table"/"@tanstack/lit-table" — and the "upgrade" synonym. Not 3: keyword coverage is richer than a single generic term.

Distinctiveness Conflict Risk

"lit Table v8 to v9" pins both framework and versions, making it mostly distinct from sibling framework-adapter skills. Not 5: "with shared API changes in the core migration skill" ties it closely to the closely related core migration skill, creating minor overlap risk.