Conciseness

Almost every sentence carries non-derivable project-specific policy rather than concepts Claude already knows, but the ~500-line body includes repetition (footprint chirality and HotSwapKeySwitch guidance appear in multiple sections) and motivational anecdotes ('A mirrored microphone footprint ... reached JLCPCB order review') that could be trimmed. Anchor 3 (mostly efficient, some tightening possible); not 4 because the repetition and narrative padding across sections is noticeable.

Actionability

Fully executable throughout: copy-paste TSX/TS/JSON blocks, exact commands like `pcb.run(profile="check", reroute_nets=[...])`, numeric thresholds (3.5mm M2.5 keepout, 0.30mm traces, 0.6/0.3mm vias), and named diagnostics (`component_body_overlap`, `freerouting_reroute_target_unknown`). Matches anchor 5; the examples cover the common cases concretely.

Workflow Clarity

Numbered procedures with explicit validation checkpoints and feedback loops: the Preview Loop (run check, inspect previews, fix source, rerun), Connectivity Diagnosis (verify net/DSN/DRC evidence before editing), and Copper Pour Islands (one hypothesis at a time, rerun check, confirm no new island). Anchor 5's sequence-plus-error-recovery-loop pattern is met; not 4 because validation steps are explicit, not merely present.

Progressive Disclosure

Three real reference files are well-signaled and read at the right moments ('Read references/pcb-config.md before editing source/pcb.config.json'; 'See HARD RULE ... in references/footprints.md'), one level deep. However, long detailed policy sections (Verified Production Export Support, Electromechanical Footprints, Standard PCB Fabrication Bias) are inlined in SKILL.md where a reference file would fit. Anchor 4 (good structure, minor organization gaps); not 5 because substantial non-overview content lives in the main file.

Specificity

Names the domain ('Project Replicator PCB') and six concrete work areas ('source, layout, routing, DRC, fabrication, or PCB visual-review work'), but no action verbs state what the skill does. Anchor 3 fits (domain plus limited concrete actions); not 4 because there is no list of specific capabilities, only trigger scopes.

Completeness

The 'when' is explicit ('Use before ... work') but the 'what' is entirely absent — the description never states what the skill provides (policy, references, commands). This matches anchor 2 ('only when is present without what'); it cannot be 3, which requires a clear 'what'.

Trigger Term Quality

Natural keywords users would say are present: 'PCB', 'layout', 'routing', 'DRC', 'fabrication', 'visual review'. A few natural terms are missing ('footprint', 'Gerber', 'netlist', 'board'), matching anchor 4 rather than 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

'Project Replicator' plus the scoped PCB work list carves a clear niche with distinct triggers and minimal conflict risk with generic PCB or tscircuit skills. Clearly anchor 5; not 4, since the project name disambiguates even closely related skills.