Conciseness

The body is mostly efficient — ecosystem-specific terms (SEND, EQS, S1/S2/N1/D1, Tier-1/2/3) are information Claude does not already have — but the same boundaries are restated repeatedly: the intro paragraph repeats the description nearly verbatim, and "does not compute EQS / not legal advice / does not own the consent record" reappears in the intro, Skill Contract, Data Sources, instruction 6–7, and the Scope guard. This fits the score-3 anchor ('could be tightened'); it is not score 2 because no section explains concepts Claude already knows or is padded with filler.

Actionability

Instructions are concrete and executable for a design skill: exit rules per step ("hard exit-on-reply and a hard exit-on-opt-out"), a five-type reply routing table, CAN-SPAM elements named precisely ("accurate From / reply-to identity, a non-deceptive subject line, a physical postal address, and a working opt-out honored promptly"), and a concrete S-read rubric. Not score 5 because it stops short of any worked example — no sample branch table, sequence-map shape, or warmup ramp numbers — leaving the executor to synthesize the output formats from prose.

Workflow Clarity

Steps 1–7 are clearly sequenced with explicit validation checkpoints: a "Done when" completion checklist, a Decision Gates section giving concrete stop-and-ask vs continue-silently criteria, and feedback loops for error recovery (mark NEEDS_INPUT on incomplete S coverage; auditor BLOCK on S1/S2 routes back here to fix). This matches the score-5 anchor (explicit validation steps, feedback loops, checklists); score 4 is ruled out because checkpoints are not merely 'mostly' present — they are stated for every gate.

Progressive Disclosure

The Reference Materials section clearly signals one-level-deep references with a purpose note for each file (send-benchmark.md, skill-contract.md, CONNECTORS.md, SECURITY.md, sibling SKILL.md files), and sections are well organized. Not score 5 because the body inlines substantial contract/policy detail (full Skill Contract, Promotes/Writes rules, Decision Gates policy) that belongs in the referenced skill-contract.md, and all referenced files live outside this bundle's directory (no references/, scripts/, or assets/ are present), so the SKILL.md is not a lean overview pointing at a well-structured bundle — it is closer to 'good structure, minor organization gaps'.

Specificity

The description enumerates concrete outputs — "a multi-step outbound sequence with reply-triage branches (positive / objection / referral / not-now / opt-out), a warmup + send-throttle ramp schedule, jurisdiction opt-in/CAN-SPAM guardrails... and a SEND S-dimension read" — matching the anchor for multiple specific concrete actions with comprehensive coverage. It does not fit the score-4 anchor because there are no minor gaps; every capability of the skill is named, including the non-goals.

Completeness

It explicitly answers both questions with concrete trigger phrases: "Use when the user asks to 'build a B2B cold-outbound sequence'..." (when) and "produces a multi-step outbound sequence with..." (what). This matches the score-5 anchor exactly; the 'when' clause is explicit and multi-phrased, ruling out score 4's 'could be more explicit'.

Trigger Term Quality

Trigger phrases are quoted verbatim as natural user requests: "build a B2B cold-outbound sequence", "design reply-triage branching", "plan a domain warmup / sending throttle", "make my outbound CAN-SPAM / opt-in compliant" — comprehensive coverage of the natural phrasings a user would say, including synonyms (warmup, throttle, opt-in, compliant). Not score 4 because no common variation of the request is missing.

Distinctiveness Conflict Risk

It carves a clear niche and explicitly disclaims the three adjacent skills: "Not for B2C lifecycle flows — use email-sequence-designer; not for the consent record — use consent-registry; not for computing EQS — use email-quality-auditor." Minimal conflict risk per the score-5 anchor; the skill's scope is distinct from all named siblings.