Conciseness

The body is telegraphic and dense with repo-specific facts Claude could not know (catalog workspaces, `exactOptionalPropertyTypes`, no `tailwind.config.js`, `bun check` vs `tsc`), with essentially no concept explanation. It misses a 5 only because bare time-sensitive version numbers ("1.4.4", "SvelteKit 3") appear outside any old-patterns/deprecated section, which the rubric penalizes.

Actionability

The `bun run` command block is copy-paste ready and annotated, script names are exact (`scripts/check-bun-version.ts`, `scripts/certs.ts`), and policies are stated as concrete directives ("Do not introduce npm, yarn, or pnpm", "Never bypass hooks (`--no-verify`, `LEFTHOOK=0)`"). For an instruction-only skill this fully meets the top anchor.

Workflow Clarity

The workflows that exist include a feedback loop (pre-commit: "format is checked, not fixed — run `bun run fmt` / `md:fmt`, then stage") and coupled-change guidance ("change all of them together"), so it sits above anchor 3's implicit checkpoints. It is not a 5 because most of the body is a policy reference rather than a sequenced process — there is no end-to-end sequence for a typical change, though no destructive/batch cap applies.

Progressive Disclosure

Sections are well organized with clear headers, references are one level deep and clearly signaled ("Details in docs/local-https.md", "(docs/security.md)", and a table routing to the svelte / bdd-bun-test / agent-browser skills), and nothing inlined here clearly belongs in a separate bundle file. This matches the top anchor for a compact overview with well-signaled external references.

Specificity

The description enumerates several specific concrete elements — "Bun-only tooling", "Lefthook hooks", "Conventional Commits", "type checking with `bun check`", "reference repositories in repos/" — with only minor coverage gaps. It falls short of a 5 because these are topic nouns rather than performed actions (no verbs at all), and above a 3 because far more than 1-2 concrete items are named.

Completeness

Both parts are explicit: the "what" ("Repository conventions for this Bun starter — ... type checking with `bun check`, and reference repositories in repos/") and a concrete multi-clause "when" ("Use when starting work in this repository, choosing tools, running checks, committing, or when AGENTS.md / CLAUDE.md point here"). The "when" is specific and multi-triggered, so it exceeds the anchor-4 case where triggers "could be more explicit".

Trigger Term Quality

"starting work in this repository", "choosing tools", "running checks", "committing", and "when AGENTS.md / CLAUDE.md point here" are natural phrases a user would say, backed by distinctive keywords (Lefthook, Conventional Commits, bun check). Not a 5 because common variations like "lint", "format", "verify", or "ci" are missing; not a 3 because coverage is good rather than partial.

Distinctiveness Conflict Risk

It carves a clear niche — conventions for one specific Bun-based starter — with distinct triggers (bun check, Lefthook, repos/, AGENTS.md/CLAUDE.md pointers), so conflict risk is minimal. The Tailwind/SvelteKit mentions only marginally overlap with related skills, which the skill itself routes to explicitly, keeping this at 5 rather than 4.