Conciseness

The ~470-line body stays on skill-specific contracts with no generic padding, but the snapshot-mode disambiguation is stated three times (dedicated section, 'Resolve it before anything else', and again in Step 1), and the Validation Checklist and Common Failures tables restate the same failures. This is more than the 'minor instances' of the anchor above, so it sits at the mostly-efficient-could-be-tightened anchor.

Actionability

Fully executable guidance throughout: a runnable bash block for path/version resolution, a concrete checks.yaml example with real values ('curl -s -o /dev/null -w %{http_code} localhost:3000/me...'), a complete ready-to-fill plan template, and numbered authoring rules tied to specific validation rules. The placeholders are the deliberate artifact template, not pseudocode.

Workflow Clarity

Four clearly ordered steps with an explicit validation checkpoint ('After writing, verify against the checklist... If any item fails, fix the offending file(s) immediately'), a full post-write validation checklist, and a Common Failures table that serves as error-recovery feedback ('create rows but no Existing Code Survey → Run the reuse searches, add the section'). This matches the top anchor: explicit validation, feedback loops, and checklists.

Progressive Disclosure

No bundle files exist; the body is one well-sectioned document (Prerequisites / Procedure / Template / Validation Checklist / Common Failures) with clearly signaled, one-level-deep cross-skill references (e.g. phase-4-testing.md#executable-checks-loop). Good structure with minor gaps: the Extended-tier template commentary and duplicated failure guidance are long enough that a separate reference file would ease navigation, keeping it below the top anchor.

Specificity

Multiple concrete actions with exact artifacts and paths ('Create the plan artifact (plan.md + checks.yaml executable acceptance checks) in `.agent/{branch}/`', 'writes plan.md and re-derives checks.yaml', 'an immutable plan.vN.md snapshot is written only in opt-in snapshot mode'), in third person throughout. Coverage of the skill's write behavior is comprehensive, matching the top anchor rather than the 'minor gaps' anchor below it.

Completeness

Explicitly answers both what ('Create the plan artifact... from the current conversation context') and when ('Use after planning is complete and confidence gate passes — and again on every plan iteration', plus a dedicated trigger list), matching the anchor requiring concrete trigger phrases for both.

Trigger Term Quality

'Triggers on create plan, generate plan, write plan artifact, regenerate plan, iterate on plan' gives good natural-phrase coverage, but common variations like 'update the plan' or 'plan document' are missing, so it does not reach the synonym-level breadth of the top anchor.

Distinctiveness Conflict Risk

The niche is pinned by specific artifacts (.agent/{branch}/plan.md, checks.yaml, plan.vN.md) and workflow phases ('Phase 4 auto-replan'), but generic triggers like 'create plan' carry minor overlap risk with general planning skills, keeping it below the minimal-conflict anchor.