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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description's contribution is the disclosure of what is returned (title, summary, public teaser in Markdown, sources) plus a real access limitation (full body is subscriber-only and unavailable here). That is meaningful context beyond the annotations, though nothing is said about volume, pagination or ordering.

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?

Three tightly packed sentences with no filler; the core action and content shape are front-loaded, and the limitation is placed last. It is dense but every clause earns its place.

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?

With no output schema, the description responsibly enumerates the returned fields (title, summary, teaser, sources) and flags the subscriber-only boundary. What is missing is minor: no indication of result size, ordering, or whether the teaser is always 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?

Only one optional parameter (locale) exists and schema description coverage is 100%, including enum values and default, so the schema carries full meaning. The description says nothing about locale or response language, which is acceptable at this coverage level but adds no extra value.

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+resource ('Lista os Estudos publicados') and goes further by specifying the citation modes (edition/page for Tratado, exact myth title for Prandi) and the two tracks (Odu/Orixá), so an agent understands the domain shape. It does not explicitly name or contrast itself with siblings like list_articles or get_article, so differentiation is left to inference.

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?

Usage is implied rather than stated: the note that the full body is subscriber-only and 'não está disponível por esta ferramenta' signals a boundary, hinting the agent should look elsewhere for full content. However, no alternative tool is named and there is no explicit when-to-use/when-not framing.

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