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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is covered. The description adds genuine value beyond that by disclosing the concrete endpoint (GET shipment.gelatoapis.com/v1/shipment-methods) and the shape of each returned record, including the normal/express/pallet type values.

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?

The core purpose and return-field list are front-loaded in a single clause, with the endpoint appended last. Slightly dense parenthetical packaging, but no sentence 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?

With no output schema, the definition compensates by enumerating the returned fields and the type enum values, which is enough for an agent to use the result. It stops short of describing pagination or ordering, but for a small read-only lookup that is a minor gap.

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 coverage is 100% and the single parameter is fully documented with its ISO pattern, so the baseline is 3. The description restates the country filter's effect ('only those for one destination country') but adds no syntax or format detail beyond the schema.

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 and resource ('Gelato's shipment methods') and enumerates the fields returned (shipmentMethodUid, name, type, tracking, business/private, supported countries), so an agent immediately knows what it gets back. No sibling tool covers shipment methods, so it is trivially distinguishable from the order/product/catalog tools.

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 'optionally only those for one destination country' implies when to pass the country filter, but there is no explicit when-to-call guidance, no prerequisite statement, and no named alternative. Usage is inferable rather than stated.

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