Conciseness

The body is lean with zero filler: every line is an instruction, boundary, or check target ('Record code defects separately; inventory work does not authorize implementation changes'), and it assumes Claude's competence throughout. Nothing explains concepts Claude already knows and no section could be cut without losing guidance, matching anchor 5.

Actionability

Concrete and executable for an instruction-only skill: the Source Checks table names specific artifacts ('Subjects()', 'projection_subjects_test.go', 'API.Handlers()', 'API.OperatorHandlers()') and the verification step is explicit ('Verify changed claims against code and check source and document links'). Not anchor 5 because entry format and what a recorded claim looks like are delegated to INDEX.md, leaving minor gaps a reader of SKILL.md alone cannot fill.

Workflow Clarity

A coherent implicit sequence exists (read INDEX → read relevant categories → update or report findings → verify claims and links → report categories checked and unresolved findings) with explicit checkpoints ('Verify changed claims against code', 'Report the categories checked and any unresolved findings'). Not anchor 5 because the steps are never ordered or numbered and there is no error-recovery loop stating what to do when verification finds a stale claim; not anchor 3 because validation checkpoints are explicit, not merely implied.

Progressive Disclosure

The skill is a single ~46-line SKILL.md with no bundle files, well-organized sections, and exactly one clearly signaled one-level-deep reference (docs/architecture/INDEX.md) that routes to per-category detail. This fits the simple-skill pattern where organized sections alone merit a 5.

Specificity

Names two concrete actions ('Maintain Chatto runtime documentation in docs/architecture/', 'audit it') with an exact path and conditions. Not anchor 5 because 'maintain' and 'audit' are the only actions named — the fuller scope (update, verify, report) lives in the body, leaving minor coverage gaps in the description itself; not anchor 3 because the actions are precise and conditioned rather than generic.

Completeness

Explicitly answers both 'what' (maintain Chatto runtime documentation in docs/architecture/; audit it) and 'when' (when runtime structures change, or when requested), with distinct conditions mapped to each action. This exceeds anchor 4, whose 'when' is generic; it matches anchor 5's requirement of concrete trigger phrases for both.

Trigger Term Quality

Natural trigger phrases are present ('when runtime structures change', 'audit it when requested') plus domain terms 'runtime documentation', 'docs/architecture/', 'audit'. A few natural variations a user might say are missing (e.g., 'update the architecture docs', 'inventory'), keeping it just below comprehensive anchor 5.

Distinctiveness Conflict Risk

'Chatto runtime documentation in docs/architecture/' carves out a clear niche tied to a specific project and path; no other skill would plausibly claim these triggers, so conflict risk is minimal.