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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds content context ('versioned', 'methodological constraints') but says nothing about behavioral traits such as return size, whether all six tables are always returned, or pagination. With annotations carrying the safety burden, a 3 is appropriate.

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 sentence that leads with the object of inspection and front-loads the six-table scope. It is efficient, though the list of distinct attributes makes it slightly dense without being wasteful.

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-value details need not be spelled out, and the description covers the breadth of what the schema exposes (tables, units, IDs, definitions, publication, constraints). It is nearly complete for a schema-introspection tool, missing only an explicit statement that it returns metadata rather than observations.

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?

There is effectively one parameter with an enforced const value and 100% schema description coverage, so the schema does all the work. The description adds no syntax, value, or semantics beyond what the schema states, making the baseline 3 correct.

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 names a specific action and enumerates the artifact's contents (six versioned RMD annex tables, units, coverage, category IDs, holder definitions, source publication, methodological constraints), which is concrete enough to signal it exposes schema/metadata. However, it never explicitly differentiates itself from the sibling get_tesouro_dpf (the data fetcher) or states that it returns schema rather than data, leaving the agent to infer the schema-vs-data distinction from the name alone.

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 phrase 'before selecting data' gives an implied sequencing hint (call this prior to picking a data query), which is useful. But it names no alternative tool and gives no explicit when-not-to-use case, so the guidance stays at the implied level.

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