Conciseness

The body is dense with repo-specific rules, assumes TypeScript knowledge, and contains no filler, so it is above the midpoint. Not 5: the tsconfig.build.json split is stated in the exceptions paragraph and then repeated in 'Two base Files' ('...put them in their own tsconfig.build.json (see above)...'), and the 'preserve implies bundler... kept for legibility' aside could be trimmed.

Actionability

Two copy-paste-ready canonical JSONC configs, exact extends strings per tier, a never-redeclare table with reasons, and concrete commands ('bun install at the repo root, then bun typecheck'). Not 5: the five app tiers are specified only as table rows (e.g. 'jsx, jsxImportSource, types, include'), not complete copy-paste shapes.

Workflow Clarity

'Adding a new package' is a clear 4-step sequence with a validation checkpoint ('bun typecheck') and supporting decision rules throughout. Not 5: no error-recovery loop (what to do when typecheck fails), though the operations are non-destructive so the batch/destructive cap does not apply; not 3 because the sequence and checkpoint are explicit.

Progressive Disclosure

Well-sectioned operative rules belong in SKILL.md, and the migration rationale is correctly deferred one level deep to a clearly signaled 'Background' pointer, with no nested reference chains. Not 5: the body is a self-contained rulebook with a single external pointer rather than an overview with well-signaled distributed references; not 3 because structure and signaling are clean and nothing that belongs elsewhere is inlined.

Specificity

Names the domain and several concrete items ('two-base layering, the seven leaf tiers, and the never-redeclare list') plus concrete actions in the trigger clause ('editing any tsconfig.json', 'picking a tier', 'debugging module resolution'), but the what-side is an inventory of conventions rather than a comprehensive action list and omits coverage areas like the build-split and include rules. Not 5 because of those minor gaps; not 3 because it lists far more than 1-2 concrete actions.

Completeness

Both what ('TypeScript config conventions for this monorepo: the two-base layering, the seven leaf tiers, and the never-redeclare list') and when ('Use when adding a package, editing any tsconfig.json, picking a tier for a new app, or debugging module resolution') are explicit and concrete, matching the anchor-5 pattern. Not 4 because the when-clause is fully explicit with four specific triggers rather than merely serviceable.

Trigger Term Quality

Natural user phrases are well covered: 'adding a package', 'editing any tsconfig.json', 'picking a tier for a new app', 'debugging module resolution', 'monorepo'. Missing a few natural synonyms such as 'compiler options', 'typecheck', or 'extends', which the anchor-5 example's breadth would require.

Distinctiveness Conflict Risk

Scoped to 'this monorepo' and tsconfig.json editing with triggers ('picking a tier', 'never-redeclare list') specific to this niche, so it is clearly distinguishable and unlikely to fire for the wrong skill. Not 4 because no meaningful overlap with neighboring skills is evident from the description itself.