Conciseness

The body is mostly tight doctrine language with no education of concepts Claude already knows, but it restates the same routing decision three to four times ('Use When', 'Do Not Use When', 'Hard Routing Rule', 'Routing Matrix', 'Who Owns What'), and the 'Best Mix' and 'Final Law' sections are cryptic or rhetorical padding. That is 'some unnecessary explanation / could be tightened' rather than the several padded sections of a 2.

Actionability

The matcher-extraction heuristic, reaffirmation strings ('north-star reaffirmed: laws'), and binary review checklist are genuinely concrete, instruction-only guidance. But the workflow's substance is delegated to six ./rules/*.md files ('Run the decision ladder', 'Check the pattern catalog') that do not exist in the bundle, so key executable detail is missing rather than merely incomplete in the way anchor 4's 'minor gaps' implies.

Workflow Clarity

An 8-step numbered workflow gives a clear sequence with the binary review checklist and the reaffirmation contract acting as explicit checkpoints. Not 5 because there is no error-recovery guidance (what to do when two ladder rungs conflict, or when a pattern matches both core and feature ownership) and because half the steps resolve to missing files.

Progressive Disclosure

The body correctly defers detail to one-level-deep, clearly labeled references (Constitutional Layer, Pattern Layer, workflow steps), which is the right structure — but all six referenced files (laws.md, decision-ladder.md, performance-selection-rules.md, update-policy.md, pattern-catalog.md, anti-patterns.md) are absent from the bundle, so every deep link is broken and navigation dead-ends. That is broken navigation, not the minor organization gaps of a 4 or the merely 'not clearly signaled' references of a 3.

Specificity

The description lists several specific scope areas — 'reusable public APIs, runtime/service boundaries, builder or factory patterns, extension registration contracts, naming/layering rules, or performance-sensitive architecture' — which is well beyond a bare domain claim. It stops short of 5 because 'Constitutional source of truth' is a role statement rather than a concrete capability, and no actual design actions are named.

Completeness

Both halves are explicit: the what ('Constitutional source of truth for reusable Plate architecture and public API design') and an explicit 'Use when...' clause enumerating concrete trigger scenarios. The when-clause is specific and multi-triggered, matching the anchor-5 example's shape; it does not fall to 4 because the when is not weak or under-specified.

Trigger Term Quality

Terms like 'public API', 'builder or factory patterns', 'extension registration', 'runtime/service boundaries', and 'performance-sensitive architecture' are natural phrasings a user working on Plate would say. Not 5 because there are no synonyms or variants (e.g. 'plugin architecture', 'API contract', 'refactoring a public surface'), though file extensions don't apply to this kind of design skill.

Distinctiveness Conflict Risk

The niche (reusable Plate architecture doctrine) is clearly distinct from plugin-authoring execution, and the triggers are architecture-level rather than generic. Not 5 because 'performance-sensitive architecture' and 'introducing or changing reusable public APIs' are broad enough to occasionally overlap with a general architecture or performance skill; the body's explicit handoff boundary to the execution companion is not visible in the description alone.