get_fba_shipment_items

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

With no annotations, the description provides one behavioral hint ('sent vs received'), but fails to disclose important traits such as whether the operation is read-only, requires authentication, or has rate limits. The description does not cover permissions or side effects.

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 description is a single concise sentence. However, it is written in Spanish, which may limit clarity for an English-prompted agent. It could be restructured or added to English for better universal understanding.

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?

Given the output schema exists, return value explanation is not needed. However, the description lacks parameter semantics and usage context. For a tool with two parameters (one optional), the description is incomplete and does not fully enable correct invocation.

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 0%, yet the description offers no explanation of the parameters (shipment_id and marketplace). It does not clarify the role of the optional marketplace parameter or the required shipment_id, leaving the agent without needed context.

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 'Items of an FBA shipment: sent vs received' clearly indicates the tool returns items of a specific FBA shipment with a comparison of sent and received quantities. This distinguishes it from sibling tools like list_fba_shipments which lists shipments.

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?

No guidance on when to use this tool vs alternatives. It does not mention that to get items for a specific shipment this tool should be used, while listing shipments is handled by list_fba_shipments. The context is only implied by the name.

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