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

No annotations are provided, so the description carries full behavioral burden. It discloses the one-per-identity rule, update semantics for repeated ratings, the self-rating prohibition, and the auth prerequisite ('Needs a hub key'). It does not describe the return value or error behavior, so it falls short of a complete behavioral specification.

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?

Four short sentences, front-loaded with the action and scale, followed by the most important constraints. No filler or redundancy; every sentence conveys a distinct rule.

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 simple two-parameter mutation with no annotations or output schema, the description covers the action, conditions, rate-limiting rule, self-rating restriction, and auth requirement. Missing return or error details are minor given the tool’s simplicity and the absence of an output schema.

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?

Schema description coverage is 100%; slug and score are fully documented in the schema, including the score range and meaning. The description adds no parameter-level syntax or format beyond restating the 1-5 range, so the baseline of 3 applies.

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 states a specific verb ('Rate') and resource ('a Skills Hub entry') with the accepted range (1-5). Among siblings like skills_list, skills_get, and skills_submit, this is the only rating action, so an agent can identify it without schema inspection.

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?

Explicitly says to rate after using an entry, specifies one rating per identity per skill, notes that re-rating updates the existing rating, prohibits self-rating, and requires a hub key. This gives clear when-to-use and when-not-to-use conditions; no alternative rating tool exists among siblings.

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