Conciseness

The 17-line body is lean, assumes competence, and adds only non-obvious insight (ordering delivery so a reviewer can replay the argument); no padding explaining concepts Claude already knows. Not 5: the Why paragraph's second clause ("you have already built further on a broken base") restates the first, and rhetorical flourishes ("watch it go red, then green") could be trimmed.

Actionability

Concrete, unambiguous directives throughout: "Rebase onto clean trunk first", "Never batch the edits and verify once at the end", "the failing test first, then the fix on top", "a subtraction before the reshape, a baseline capture before the treatment". Not 5: there is no worked example (e.g., a sample commit stack showing red-then-green) to make the canonical shape copy-paste concrete.

Workflow Clarity

The core sequence is explicit with validation checkpoints: "known-good state, one change, run the check, then proceed" and "don't advance until the current one is green" — validation is central, so the batch-operation cap does not apply. Not 5: the on-red recovery loop (what to do when a unit's check fails) is only implied ("cheap to localize") rather than given as an explicit fix-then-proceed step.

Progressive Disclosure

The skill is under 50 lines with no need for external references (no bundle files exist), and the body is cleanly sectioned into Why, Execution, Delivery, and Pattern with a well-signaled cross-reference to the two sibling principle skills — matching the simple-skill exception for a top score.

Specificity

"Break work into small units that each end in a verifiable state, check each before the next, and order delivery" lists three distinct concrete actions in a specific domain, matching the 'several specific actions; minor gaps' anchor. Not 3 (more than 1-2 concrete actions) and not 5 (not a comprehensive catalog of capabilities, e.g., the on-red recovery behavior is absent).

Completeness

Both 'what' and 'when' are explicitly and concretely answered: the what is "Break work into small units that each end in a verifiable state, check each before the next, and order delivery", and the when is the explicit apply-to clause with concrete trigger phrases. The 'when' could not be meaningfully more explicit, matching the anchor-5 example's structure.

Trigger Term Quality

"multi-step work (sweeps, migrations, runs of similar edits)" and "stack commits and PRs" are natural phrases users would say when needing this skill. A few natural synonyms (e.g., 'refactor', 'bulk edits', 'review the stack') are missing, so it falls just short of the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

The description carves a distinct niche (sequencing units for verification and ordering commits/PRs as proof), but it is a broadly applicable discipline that could mildly overlap with closely related principle skills (e.g., a 'verify each change' or 'small commits' skill). Mostly distinct with minor overlap risk, matching anchor 4.