Conciseness

The body is dense, prescriptive, and assumes Claude's competence — no known concepts are re-taught — but there is minor restatement across steps ("If a material decision remains unresolved, return to step 5" in both steps 7 and 8, and the step 9 checklist re-lists step 4's edge-case and ownership rules) that could be trimmed. Efficient overall, so it sits above the 'some unnecessary explanation' anchor at 3 and below the every-token-earns-its-place anchor at 5.

Actionability

Mostly concrete — an exact question format template, the quoted adversarial-reviewer prompt, the default destination "docs/design/<descriptive-slug>.md", and the command "git diff --check -- <document-path>" — but the central drafting step (step 7) instructs "Read DESIGN-DOC-TEMPLATE.md from this skill directory before drafting" and that file does not exist in the bundle, leaving the core deliverable step non-executable. A missing key detail for the skill's primary output keeps this below the 'minor gaps' anchor at 4.

Workflow Clarity

Nine clearly sequenced steps with explicit gates and feedback loops: "Do not write the implementation plan or draft the design until this gate is complete" (step 5), reconciliation of adversarial findings with "return to step 5 and wait for confirmation" (step 8), and a final review checklist (step 9) that verifies links, commands, and unresolved blockers against the current checkout. Matches the anchor for clear sequence, explicit validation, error-recovery loops, and checklists.

Progressive Disclosure

The body itself is well sectioned and the reference is clearly signaled ("Read DESIGN-DOC-TEMPLATE.md from this skill directory"), but no bundle file exists — there is no references/ directory and no template file — so the intended one-level-deep split does not function and all drafting structure must be improvised. Structure is good, but the broken/absent reference and monolithic inline detail place this between the 'minimal structure' anchor at 2 and the 'good structure, clear references' anchor at 4.

Specificity

Names the domain and several concrete actions — "Create or update implementation-ready design proposals", "under docs/design", "a bounded design-tree decision review before drafting" — with only minor gaps (the doc's internal coverage is not enumerated). Fits the 'several specific actions; minor gaps' anchor rather than the 1-2-action anchor at 3.

Completeness

Clearly answers both halves: what — "Create or update implementation-ready design proposals for Mistral Vibe under docs/design, including a bounded design-tree decision review before drafting" — and when — the explicit "Use before implementing..." clause with concrete trigger phrases. Not 4 because the 'when' is explicit and specific rather than merely present.

Trigger Term Quality

Good natural-term coverage: "substantial Vibe feature, migration, protocol or API change, runtime or persistence change, cross-component workflow, compatibility plan". A few natural phrases users might say are missing (e.g., "design doc", "spec", "proposal review"), so it falls short of the comprehensive-synonym anchor at 5.

Distinctiveness Conflict Risk

Scoping to "Mistral Vibe" and the distinctive decision-review framing give it a mostly distinct niche, but it does not disambiguate against the closely related ADR skill the body references, leaving minor overlap risk. Not 5 for that residual conflict with sibling documentation skills.