Conciseness

The body is four lines: a one-line instruction, a copy-paste command, and one sentence of failure guidance. There is no padding and no explanation of concepts Claude already knows, matching the 'lean and efficient; every token earns its place' anchor.

Actionability

'cd crates && cargo build --release -p brightstaff' is a fully executable, copy-paste-ready command that covers the common case exactly. This matches the level-5 anchor and exceeds level 4, which allows minor gaps in executability.

Workflow Clarity

This is a simple single-task skill whose one action is unambiguous, and 'If the build fails, diagnose and fix the errors' supplies a failure feedback loop. Per the rubric's simple-skill exception, a clear single action warrants 5; the operation is not destructive or batch, so no cap applies.

Progressive Disclosure

The skill is under 50 lines with no external references needed — there is nothing to offload, and no bundle files exist to organize. Per the rubric's simple-skill exception, short skills with no need for external references can score 5 on well-organized content, which this trivially satisfies.

Specificity

The phrase 'Build the brightstaff native binary' names the domain and exactly one concrete action, with no further specifics about what the build involves. This matches the anchor for naming a domain with 1-2 concrete actions but not comprehensive coverage, and falls short of the level-4 anchor requiring several specific actions.

Completeness

It explicitly answers both parts: what ('Build the brightstaff native binary') and when ('Use when brightstaff code changes'). The 'when' clause is present but terse and could be more explicit — e.g. naming the cargo/Rust context — which matches the level-4 anchor rather than the fully concrete level-5 example.

Trigger Term Quality

Terms like 'build', 'brightstaff', 'native binary', and 'code changes' are relevant, but natural variations a user would say — 'compile', 'cargo build', 'release build', 'Rust changes' — are absent. This matches 'some relevant keywords but missing common variations or synonyms' rather than the good-coverage level 4.

Distinctiveness Conflict Risk

The project-specific name 'brightstaff' creates a clear niche with distinct triggers, and no other skill category would plausibly compete for this trigger. This matches the 'clear niche with distinct triggers; minimal conflict risk' anchor, and is clearly above the level-4 anchor that assumes overlap risk with closely related skills.