Conciseness

The body is dense with non-obvious judgment content (the 4-condition gate, "Build may not edit the acceptance conditions to pass", the failure-mode table) rather than things Claude already knows, matching 'efficient'. It falls short of the lean anchor-5 because of rhetorical padding such as "the system tends toward entropy, so maintain it" and the aphoristic one-line close, which could be trimmed without losing guidance.

Actionability

For an instruction-only skill the guidance is fully actionable: a concrete 4-condition gate ("① the task repeats weekly or more ② verification can be automated…"), decision tables for loop type and skeleton, explicit rules ("Three failed retries → escalate to a human"), a five-row checklist with literal review questions, and a worked example showing the naive vs. fixed goal. This covers common cases concretely; score 4 would require missing key details, and none are missing.

Workflow Clarity

Action 1 is a clearly sequenced 5-step process with explicit checkpoints (the 4-condition veto gate, the Step-1 self-check "can they run one command and tell whether it's done?", the staged landing plan), and Action 2 is a per-row review checklist with explicit failure conditions and antibodies. Validation and feedback loops (retry caps, escalation, three-stage rollout) are present, matching the anchor-5 pattern of sequence + explicit validation + checklists.

Progressive Disclosure

Structure is good: clear section headers, a two-level 'use / don't use' scope statement, and well-signaled one-level pointers to the mechanism layer ("see `autonomous-loops` / `continuous-agent-loop`"). It sits below anchor 5 because the single ~137-line file inlines content that could be split into references (the worked example, the failure-mode/lineage notes), and there are no reference files at all to spread detail into.

Specificity

Quotes like "Design a goal-oriented agent loop or review one for failure modes: spinning, Goodhart-gaming the verifier, or running a wrong answer to completion" list multiple specific concrete actions plus enumerated coverage ("machine-decidable goals, loop types, plan/build/judge skeletons, and runaway prevention"), matching the 'comprehensive coverage' anchor. It is not the level below (4) because there are no meaningful gaps in what it claims to cover.

Completeness

The 'what' is explicit (design and review agent loops, with covered topics and named failure modes) and the 'when' is explicit ("Use when designing, writing, or checking an agent loop") with concrete trigger phrases. This is exactly the anchor-5 example pattern (clear what AND when with concrete triggers); score 4 would require a weaker 'when', which is not the case.

Trigger Term Quality

"Use when designing, writing, or checking an agent loop" covers natural English triggers, and the Chinese trigger list ("写 loop、设计 loop、做一个 loop、检查 loop 对不对、loop 体检、loop 会不会跑飞、可判定目标、五个崩法、plan build judge") adds comprehensive synonyms users would actually say. This matches the 'comprehensive coverage of natural terms including synonyms' anchor; nothing common is missing.

Distinctiveness Conflict Risk

It carves a clear niche (goal definition and runaway prevention for agent loops) and explicitly fences off the sibling skill: "mechanism wiring lives in autonomous-loops." Triggers like "loop 会不会跑飞" and "检查 loop 对不对" are distinct from generic loop/timer keywords, so conflict risk is minimal, matching the 'clear niche with distinct triggers' anchor.