Conciseness

The body is dense and imperative, explaining only project-specific conventions and justified deviations (e.g., why `upgrade` needs `--bump`) rather than concepts Claude already knows. Minor trimmable inclusions — the full inline MIT license text and a few rationale sentences like 'just --list is the discovery surface' — keep it at anchor 4 rather than 5.

Actionability

Guidance is copy-paste ready: a 9-step sequence with exact commands (`mise use --pin <tool>@latest`, `mise trust`, `mise fmt`, `git init -b main`), complete file templates (ci.yml with pinned action SHAs, .editorconfig, README, AGENTS.md), an exact commit subject, and full per-stack commands and manifests delegated to verified reference files. This matches anchor 5's 'fully executable; specific examples cover the common cases'.

Workflow Clarity

The shared sequence is explicitly ordered with a hard validation gate in step 9 ('A red `just check` is a scaffold failure, not a caveat — fix it before telling the user the project is ready') and a pre-flight safety check ('Never scaffold over a non-empty directory without asking first'), plus a directed fix-before-done loop. Anchor 5's explicit validation and error-recovery feedback loop are both present.

Progressive Disclosure

SKILL.md is a clean overview: stack-independent steps, shared templates, and cross-stack conventions, with per-stack detail clearly signaled one level deep into references/<stack>.md ('read the matching file before step 2') and an external authority pointer to the justfile skill. All four referenced files exist and are substantive (~170–215 lines each), and the only cross-references between them (rust/go/typescript pointing at python.md for the shared justfile header) are lateral deduplication, not nested navigation.

Specificity

The description lists four concrete scaffold actions — "scaffolds mise-pinned tools, a just task surface, the standard repo files, and CI" — and names all four supported stacks with their package managers (uv, bun, cargo), giving comprehensive coverage of the skill's capabilities. It goes beyond anchor 4 ('several specific actions; minor gaps') because nothing material about the scaffold scope is left unspecified.

Completeness

Both halves are explicit: the 'what' is the enumerated scaffold output (mise-pinned tools, just task surface, repo files, CI) and the 'when' is a literal 'Use when' clause with two concrete triggers ($new-project invocation, creating a brand-new repository from scratch). This matches the anchor-5 example structure exactly; anchor 4 would require the 'when' to be less explicit than it is.

Trigger Term Quality

Natural triggers like "creating a brand-new repository or project from scratch", "invoked as $new-project", and the four stack names (Python, TypeScript, Rust, Go) match what users would say. It falls short of anchor 5 because common synonyms such as 'scaffold', 'bootstrap', 'initialize', or 'new repo' are absent.

Distinctiveness Conflict Risk

The from-scratch constraint, the explicit $new-project invocation name, and the mise/just toolchain scope carve out a clear niche that would not fire for existing-project skills (e.g., adding a justfile or Brewfile to a repo). Conflict risk with other skills is minimal.