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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile needs no restatement. The description does add useful nuances (zero arguments, prices carry an as-of date, founder credential appears in fixed order), but omits freshness of the profile itself or any auth/serving constraints.

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?

Leads with usage, then inventory of returns, then the routing caveat — a sensible front-loaded order with no filler sentences. The long mid-sentence enumeration of every offer type is heavier than needed for a no-argument tool with a published output schema.

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 zero-parameter, read-only tool with an output schema and full annotations, the description covers scope, contents and where related institutional data lives. What remains thin is differentiation from overlapping siblings like contactUs and listCourses.

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 no parameters, which is the baseline-4 case. 'No arguments' matches the empty schema and adds no contradiction or missing detail.

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 gives a specific resource (Alexandre Caramaschi's practice profile, offers, pricing, contact channels) with concrete usage triggers, so the agent knows exactly what comes back. It does not name sibling tools to disambiguate, and its overlap with contactUs and listCourses is left implicit, though the routing note to brasilgeo.ai for institutional data helps.

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?

Explicit triggers are given ('who he is', 'what he offers at what price', 'how to reach him'), plus a clear exclusion: Brasil GEO institutional data lives at brasilgeo.ai. No sibling tool is named as an alternative, so the overlap with contactUs remains unresolved.

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