Conciseness

The body is lean with zero padding: a one-line purpose statement ('更新用户档案信息。'), a minimal parameter table, a flat list of supported keys, and two related-skill pointers. Every token earns its place and nothing explains concepts Claude already knows.

Actionability

The parameter table gives concrete names, types, and required flags, and the 'Supported Keys' section enumerates all eleven valid keys — concrete, executable guidance for a tool-invocation skill. It falls short of 5 because there are no usage examples (e.g., a sample key/value pair) and no instruction for handling information that matches no supported key.

Workflow Clarity

As a simple single-action skill (call the tool with a key and value), the single action is largely unambiguous, qualifying for the simple-skill exception. It stays at 4 rather than 5 because the mapping from a natural-language user statement to a specific supported key is left implicit, a minor gap in the one decision point the workflow has.

Progressive Disclosure

The skill is under 50 lines with no need for external references, and the content is cleanly organized into well-labeled sections (Parameters, Supported Keys, Related Skills). Per the simple-skill guideline, this earns full marks with no separate files required; no bundle files exist to reference.

Specificity

The description lists several concrete actions — 'Update user profile information', 'save user preferences', 'remember user's work domain' — with only minor vagueness ('provide personalized service'). It is not a 5 because it never names what profile fields or data types are involved, leaving minor gaps in coverage.

Completeness

It explicitly answers both what ('Update user profile information') and when with concrete trigger phrases ('when user shares preferences, habits, or work details'). This clearly matches the anchor for explicit what-and-when with concrete triggers, and exceeds the level-4 anchor where the 'when' is only serviceable.

Trigger Term Quality

Natural phrases users would actually say are present: 'preferences', 'habits', 'work details', 'work domain'. A few natural terms are missing (e.g., 'profile', 'personal info', 'remember that I...'), keeping it just below the comprehensive synonym coverage of a 5.

Distinctiveness Conflict Risk

The user-profile niche ('save user preferences', 'remember user's work domain') is mostly distinct with clear triggers, though broad terms like 'preferences' create minor overlap risk with general memory or personalization skills. It is below a 5 because it is not a razor-sharp niche, and above a 3 because the profile-storage framing separates it from most other skills.