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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds genuine behavioral context: the list is finite (14), 'live-verified' (freshness guarantee), and scoped to primary navigation rather than every possible section.

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 sentences, no filler: sentence one defines scope and payload, sentence two gives the follow-up action. The routing instruction is front-loaded after the enumeration, which is appropriate.

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?

An output schema exists, so return-shape explanation is unnecessary, and with no input parameters the description's only jobs are scope and next-step routing, both of which are fully covered.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline is 4. The enumerated slug vocabulary acts as an implicit value domain for downstream calls.

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?

States a specific verb (List) and resource (MakeUseOf primary-navigation RSS sections) and enumerates all 14 slugs, so the agent knows exactly what comes back. It is trivially distinguishable from siblings like makeuseof_headlines, makeuseof_news, and makeuseof_article.

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 routes the consumer: 'Use one returned slug with makeuseof_headlines' tells the agent this is the discovery step feeding the headlines tool. It lacks a 'when not to use' clause or mention of makeuseof_news as an alternative, so it falls short of a full 5.

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