Conciseness

The body is efficient and product-specific (transaction engine, vault path rules, z-order conventions) with no padded conceptual explanations, but a few guard-raiding lines explain things Claude already knows, e.g. "Escape line breaks in JSON strings as \n, not as literal backslash-plus-n text", and the link-node Open Graph egress disclosure runs long. This fits anchor 4 (efficient, minor instances that could be trimmed) better than anchor 5's 'every token earns its place'.

Actionability

Guidance is mostly executable: a concrete bash snippet resolving $CORE, a complete valid JSON node example, and copy-paste transaction commands ("python3 \"$CORE\" transaction inspect BUNDLE --vault VAULT"). Minor gaps remain — variables like APPROVAL_SHA256 and BUNDLE are placeholders the model must fill, and no link/group/edge JSON examples appear inline (they live in the reference file) — so anchor 4 fits better than anchor 5's fully covered common cases.

Workflow Clarity

The mutation workflow is clearly sequenced (read + record SHA-256s → draft preserving unknown fields → validate against an explicit checklist → build one bundle → inspect → apply with approved SHA) with explicit validation checkpoints, a checklist before preview, an inspect/approval-hash feedback loop, and a consent step for destructive edits. This matches anchor 5; importantly, the destructive-operation guideline (validation must exist to exceed 3) is satisfied, so no cap applies.

Progressive Disclosure

The 140-line body is a workflow overview, with format details appropriately split into references/canvas-spec.md (verified to exist, 301 lines) linked one level deep and clearly signaled ("Otherwise read [references/canvas-spec.md](...)") plus a clearly signaled product reference ("Read [operation-transactions.md](../wiki/references/operation-transactions.md)" with its resolution rule stated up front). This matches anchor 5's clear overview with well-signaled one-level-deep references.

Specificity

"Create, inspect, and update Obsidian JSON Canvas boards" names multiple concrete actions and further enumerates the concrete object types ("text, file, link, group, and edge nodes"), giving comprehensive coverage of the skill's capabilities. Anchor 4 would apply if there were minor gaps, but the action verbs plus node/edge enumeration cover the domain completely.

Completeness

The "what" is explicit (create/inspect/update boards with the five node/edge types) and the "when" is explicit via "Use for ... and requests such as create canvas, add to canvas, or put this on the canvas" with concrete trigger phrases. Both halves are clearly and explicitly answered, matching the anchor-5 example structure; third-person voice is used throughout.

Trigger Term Quality

Natural user phrasing is comprehensively covered: "canvas status", "canvas lists", "visual maps", "zones", "spatial layouts", the ".canvas" file extension, and direct request phrasings like "create canvas", "add to canvas", "put this on the canvas". This matches the anchor-5 pattern of including synonyms and file extensions; no common variation is missing.

Distinctiveness Conflict Risk

"Obsidian JSON Canvas boards" and the ".canvas" extension define a clear niche with distinct triggers (canvas status, visual maps, add to canvas), so overlap risk with other skills is minimal. It is not generic like the anchor-2/3 examples and fits the anchor-5 'clear niche with distinct triggers' best.