Mostly dense and procedural with no padding of concepts Claude already knows, but not every token earns its place: the Verifier is described twice (Critical Rules #4 and again in Sub-Agent Delegation), and the "Output Behavior" model-guidance section is tangential ceremony. Not a 3 because of this redundancy and ceremony; not a 1 because it never explains basic concepts.

Gives concrete, actionable guidance — exact commands ("python3 scripts/lessons.py list --status confirmed"), the .specs/ directory tree, trigger-to-reference mapping tables, and concrete rules ("One atomic commit per task"). Per the instruction-skill scoring note, absence of code is not penalized when guidance is actionable; not a 2 because nothing is pseudocode or missing key details for its role as a coordinator.

Clear Specify→Design→Tasks→Execute sequence with explicit validation checkpoints ("the gate must pass... before a task is done", always-on Verifier after the last task) and an explicit feedback loop ("fix→re-verify loop is bounded to 3 iterations before escalating"). Not a 2 because checkpoints and retry bounds are explicit, not implicit.

Clear overview body with well-signaled one-level-deep references (all [name](references/name.md) links resolve to real files), content split by phase plus cross-cutting concerns, and easy navigation via the Commands trigger tables. Not a 2 because references are clearly signaled and one level deep, not inline walls of text; the unreferenced coding-principles.md orphan is a minor nit.

Lists many concrete actions — "Creates atomic tasks with verification criteria, atomic git commits, and requirement traceability", "independent Verifier (author != verifier, evidence-or-zero)", "persistent decision log (STATE.md)", "test-coverage-matrix-driven tests", "self-improving lessons layer" — matching the multiple-specific-actions anchor. Not a 2, which only names a domain and some actions without this comprehensiveness.

Explicitly answers what (4 adaptive phases, atomic tasks/commits, Verifier, decision log, lessons) and when (numbered "Use when (1)... (2)... (3)..." plus "Triggers on ..."). Not a 2, where the "when" is missing or only implied.

Provides broad natural-language triggers ("specify feature", "discuss feature", "verify work", "record decision", "pause work", "resume work", "UAT") a user would actually say. Not a 2 because coverage is broad rather than missing common variations, though a few single-word triggers ("design", "tasks") are terse.

Clear niche (spec-driven 4-phase feature dev) with explicit de-confliction guardrails: "Do NOT use for architecture decomposition analysis (use architecture skills) or technical design docs (use create-technical-design-doc)." Not a 2 because the negative-scope guidance sharply reduces overlap, though the single-word triggers are a mild residual risk.