Conciseness

The body is dense with directives ('fold setup, configuration, scaffolding, and documentation steps into the task whose deliverable needs them') with no padded tutorial prose. Minor trimming is possible — 'Task Right-Sizing' and 'Bite-Sized Task Granularity' overlap, and lines like 'You reason best about code you can hold in context at once...' add rationale Claude does not need.

Actionability

Fully executable guidance: exact plan header template, task structure with precise paths and line ranges ('Modify: `exact/path/to/existing.py:123-145`'), runnable commands with expected results ('Run: `pytest tests/path/test.py::test_name -v` / Expected: FAIL with "function not defined"'), commit message examples, and a concrete named-bug example (clearLayers() vs clearFullLayers()). Copy-paste ready throughout.

Workflow Clarity

Clear top-level sequence (announce → scope check → file structure → tasks → save → self-review → execution handoff) with an explicit Self-Review checklist covering spec coverage, placeholder scanning, and type consistency, plus a fix-inline feedback loop. Validation checkpoints (verify-fails / verify-passes) are embedded in every task cycle.

Progressive Disclosure

Well-organized sections with all content appropriately placed and sub-skill references clearly signaled by name, but no bundle files exist while the full plan-header and task-structure templates are inlined in SKILL.md. At ~170 lines the under-50-line simple-skill exception does not apply; externalizing the templates into a reference file would tighten the overview.

Specificity

The description names the domain ('a spec or requirements for a multi-step task, before touching code') but contains no action verbs — it never states what the skill does, e.g. 'Writes implementation plans'. Anchor 2 ('Names the domain but actions are minimal or generic') fits; anchor 3 requires 1-2 concrete actions which are absent, and anchor 1 would require vague, abstract language rather than a sharply defined situation.

Completeness

The 'when' is explicit and specific ('Use when you have a spec or requirements for a multi-step task, before touching code') but the 'what' is entirely missing. Anchor 2 explicitly covers 'only when is present without what'; anchor 3 requires a clear 'what', which this description lacks.

Trigger Term Quality

'Spec' and 'requirements' are natural user phrases, and 'before touching code' matches how users describe pre-implementation work. However common synonyms are missing: 'plan', 'implementation plan', 'design doc'. Anchor 3 ('Some relevant keywords but missing common variations or synonyms') fits better than 4, whose keyword coverage is broader.

Distinctiveness Conflict Risk

'Before touching code' plus the spec prerequisite situates the skill reasonably well, but it would overlap with sibling planning skills (brainstorming, executing-plans) and does not state a distinguishing capability. Anchor 3 ('Somewhat specific but could still overlap with similar skills') fits; anchor 4 would require clearly distinct triggers.