Conciseness

Every line carries repo-specific, non-inferable knowledge (the registry-as-gate rule, the import cycle, the client-safe boundary, per-file failure modes for metadata) and it teaches zero general concepts, even delegating to TSDoc ("read the TSDoc in `types.ts` before overriding"). Lean and assuming of Claude's competence; nothing to trim, so not 4.

Actionability

Copy-paste-ready commands throughout: `cd apps/sim && bun run type-check`, the full grep `grep -rnE "(===|!==) '{id}'|case '{id}':" apps/sim --include='*.ts' --include='*.tsx' | grep -v column-types/`, the exact test-suite invocation, and a complete icon component template with concrete geometric constraints. Fully executable guidance covering the common cases, matching the 5 anchor.

Workflow Clarity

Sequenced Steps 1-5, a pre-finish checklist, and a 'Final Validation (Required)' section with five explicit gates and error-recovery feedback loops ("If any file *outside* `column-types/` errors, that file has a hardcoded type list; fix it to read the registry"; "needing to edit one means you changed behavior"). Clear sequence, explicit validation, and recovery guidance — the 5 anchor.

Progressive Disclosure

Well-organized sections with clear headers and a coherent flow (rule, structure, steps, traps, checklist, validation), so navigation is easy. Not 5 because at ~155 lines with no bundle files, self-contained blocks like the metadata-registration failure table and the 'Watch out' traps could be split into one-level-deep reference files; not 3 because nothing is buried and the in-file structure is genuinely clear.

Specificity

"registry entry, icon, storage shape, coercion, and the behavioral hooks the grid and API read" enumerates the concrete artifacts of the task comprehensively, mapping one-to-one onto the skill's actual steps. Not 4 because there are no minor coverage gaps in the component list.

Completeness

Explicitly answers both: the what is a concrete component list ("registry entry, icon, storage shape, coercion, and the behavioral hooks") and the when is an explicit 'Use when adding a value kind under ...' clause with a concrete trigger. This matches the 5 anchor exactly, not 4, because the when-clause needs no added explicitness.

Trigger Term Quality

"Add a new table column type" and "adding a value kind" are natural phrases a user would say, plus the concrete path trigger `apps/sim/lib/table/column-types/`. Not 5 because common synonyms like "field type" or "data type" are absent; not 3 because the core trigger phrase is present verbatim with good coverage beyond 'some relevant keywords'.

Distinctiveness Conflict Risk

"a new table column type to Sim" plus the specific directory path carves out a clear niche no other skill would claim. Minimal conflict risk; matches the 5 anchor ('clear niche with distinct triggers').