Conciseness

The body is lean and assumes competence throughout: rule ids with one-line summaries, the exact output format "SEV<TAB>RULE<TAB>path:line<TAB>snippet", exit-code semantics, and config gotchas — no filler and no explanation of concepts Claude already knows. Even the maintainer and known-limitations sections are dense, non-inferable facts that earn their tokens.

Actionability

Fully executable guidance: three copy-paste-ready gate invocations ("uv run python .agents/skills/kiln-conventions/scripts/conventions_gate.py --worktree" etc.), the allowlist procedure with a reason-line format, and a concrete FAIL/WARN decision tree with an example justification. The self-check section converts each rule id into a checkable condition.

Workflow Clarity

A clear five-step sequence (read rules → read per-area references → write → run gate → self-check) where the gate is an explicit validation checkpoint, with feedback loops for error recovery (FAIL → fix and re-run; unfixable → report with rule id, path:line and the refactor it waits on) and a checklist for what the gate cannot see. The reviewer and maintainer workflows are separately sequenced.

Progressive Disclosure

The overview stays in SKILL.md while bulk content is split one level deep and verified to exist: rules in references/rules.md, per-area facts selected via a path→reference table (core.md, server_desktop.md, web_ui.md), and the gate plus its tests, config and allowlist under scripts/. The only external pointer (kiln-ui) is another skill, appropriately referenced rather than duplicated.

Specificity

The description lists multiple concrete capabilities — "code conventions and per-area gotchas", "a diff gate that enforces the mechanical ones" — alongside a comprehensive coverage list ("comments, startup and entry points, globals and module state, config reads, module layering, library-vs-app rules and async I/O") and concrete scopes ("Python, TypeScript or Svelte code", the four repo areas). It exceeds the level-4 anchor's 'minor gaps in coverage'.

Completeness

Both questions are explicitly answered: the 'what' ("Kiln's code conventions and per-area gotchas, plus a diff gate that enforces the mechanical ones") and the 'when' ("Invoke before writing or changing any Python, TypeScript or Svelte code in the Kiln repo ..., and when reviewing such a change") with concrete trigger phrases.

Trigger Term Quality

Good natural keyword coverage: "Python, TypeScript or Svelte code", "writing or changing", "reviewing such a change", and the concrete repo paths. A few natural synonyms users might say (e.g. "coding style", "lint", "PR") are missing, so it fits the level-4 anchor rather than the comprehensive-synonym level-5 anchor.

Distinctiveness Conflict Risk

It is tightly scoped to the named Kiln repo with specific languages and directory paths, giving it a clear niche with minimal conflict risk; the one adjacent skill (kiln-ui) is explicitly carved out in the body. Not the level-4 anchor because there is no meaningful overlap risk with other skills.