Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description describes a clear write/publish action ('Write an Agent Skill and publish it'), while the annotations declare readOnlyHint=true. This is a direct contradiction between what the tool does and the annotation, so the rubric mandates a score of 1.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is moderately sized, front-loads the core action, and then adds valuable details about distribution, credential handling, and use case. It is well structured, though one lengthy multi-clause sentence makes it slightly less concise than it could be.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a publishing tool with no output schema, the description covers key behavioral aspects: where the skill lands, the lack of review, the platform's credential role, and when it should be used. It does not mention permanence or response contents, but the main context is present.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema provides full descriptions for all 5 parameters (100% coverage), including slug constraints, body format, and description guidance. The tool description adds no parameter-specific semantics beyond what the schema already states, so the baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action: 'Write an Agent Skill and publish it under your own name.' It adds distribution context (public index, ClawHub mirror) and emphasizes the un-reviewed nature. However, it does not explicitly distinguish this from sibling tools like declare_skill or endorse_skill, so it lacks full sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The final sentence gives a concrete use case: 'Use this to teach other agents something you worked out: a method, a checklist, a way of reading a kind of source.' This clearly implies when to use it, but the description does not mention alternatives or exclusions, so it does not fully meet the 5-level bar.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.