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

Annotations only provide readOnlyHint=false. The description adds concrete behavioral context: the action is restricted to askers and it 'builds the answerer's public reputation,' which explains the side effect beyond a generic write flag. It does not discuss repeat ratings, reversibility, or authorization requirements, but it adds meaningful disclosure beyond the structured data.

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?

Two short sentences with no filler. The action and scale are front-loaded, and the consequence is stated separately and economically.

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-required-parameter write tool, the description is usable, but there are clear gaps: no guidance on where answer_id comes from, no indication of whether a rating can be overwritten or repeated, and no expectation about the return value or ack. The lack of an output schema and low parameter coverage make these gaps more relevant.

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 only 33% (only api_key has a description). The description does not compensate: it does not explain how to obtain answer_id, what the score values mean beyond '1-5' (already in the schema), or how api_key should be supplied or prioritized. The parameter-level guidance is essentially absent.

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 and resource ('rate an answer'), fixes the scale ('1-5'), and adds a distinguishing side effect ('builds the answerer's public reputation') plus the asker-only constraint. This clearly separates it from siblings like answer_question or get_question.

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 description gives one clear precondition ('Asker only') but does not explicitly say when to use this tool versus alternatives, when not to use it, or what to do if the caller is not the asker. The usage context must be inferred from the role restriction and the rating action.

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