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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world behavior, so the safety profile is covered. The description adds value beyond that by disclosing what the response contains (full text in Markdown plus date, subject, original source and citation form), which is meaningful since no output schema exists. It stops short of describing failure or not-found behavior.

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?

A single well-formed sentence with no filler, and the core action (returns the full text in Markdown) is front-loaded ahead of the metadata details. It could be tightened slightly by naming the sibling search tool, but nothing is wasted.

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 one-parameter, read-only fetch tool with full schema coverage and rich annotations, the description supplies everything an agent needs: what is returned, in what format, and what accompanying metadata comes with it. No output schema is required because the return content is described in prose.

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% and the parameter is documented with both an example slug and the alternative page-address form, so the schema carries the burden. The description adds nothing further about the identifier format, so baseline 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 and resource: it returns the full text of an article, in Markdown, along with metadata. An agent can distinguish this from siblings like buscar_artigos or artigos_recentes because it is a single-article fetch, though the description never names those alternatives explicitly.

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 only implied: an agent infers this is the tool to call once it already has an article identifier and needs the complete content rather than a list or search result. There is no explicit when-to-use or when-not-to-use statement, and no mention of what to do if the article is not found.

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