Conciseness

The body is a lean ~35 lines: a one-line summary, a parameter table with types and defaults, a three-bullet returns list, trigger cases, and one related-skill pointer. No padding, no explanation of concepts Claude already knows — every token earns its place.

Actionability

The parameter table is concrete and executable guidance ("limit | integer | 否 | 获取最近多少条消息，默认 20"), and the Related Skills section points to `deliver-artifacts` for the follow-up action. It falls short of the 5 anchor because there is no example invocation or response-format sample, which for a tool skill would make the guidance fully copy-paste ready.

Workflow Clarity

This is a simple single-purpose skill under 50 lines whose single action (call the tool with the documented parameters) is unambiguous, so per the simple-skill exception it scores 5 despite having no multi-step workflow. It is not a destructive or batch operation, so no validation cap applies.

Progressive Disclosure

The skill is under 50 lines with no need for external references — no references/, scripts/, or assets/ bundle exists — and the body is organized into clear Parameters/Returns/When to Use/Related Skills sections. Per the rubric guideline, well-organized sections alone warrant a 5 in this case, and the single outbound link is clearly signaled.

Specificity

"Get current chat history including user messages, your replies, and system task notifications" names the domain and enumerates three concrete content types retrieved. Not a 5 because it describes a single retrieval action rather than a comprehensive list of capabilities, and not a 3 because the inclusion list is more specific than the '1-2 concrete actions' anchor.

Completeness

It explicitly answers both 'what' ("Get current chat history including user messages, your replies, and system task notifications") and 'when' ("When user says 'check previous messages' or 'what did I just send', use this tool") with concrete trigger phrases. Clearly matches the 5 anchor; the 4 anchor applies only when the 'when' clause is less explicit, which is not the case here.

Trigger Term Quality

"check previous messages" and "what did I just send" are natural phrases a user would plausibly say, giving good trigger coverage. Missing a few natural variations (e.g., 'chat history', 'scroll back', 'what did we talk about'), which keeps it below the comprehensive synonym coverage of the 5 anchor.

Distinctiveness Conflict Risk

Chat-history retrieval with quoted conversational triggers is a clear niche unlikely to fire for unrelated skills. Minor overlap risk remains with any conversation-context/recap skill, so it sits at 'mostly distinct' rather than the minimal-conflict 5 anchor.