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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds 'paginated' and the 100-shipment-ID cap, which is genuine extra context, but says nothing about behavior with invalid or unknown shipment IDs or what happens past the cap.

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?

One front-loaded sentence with no filler, stating resource and scope immediately. It is efficient but so terse that the sibling relationship and pagination contract are left entirely implicit.

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 shape needn't be explained, and annotations handle the safety profile. However, for a tool with a near-identical sibling, the description omits the disambiguation an agent needs to select correctly, which is the main remaining 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 description coverage is 100%, so limit, offset, sellerIds, and shipmentIds are fully documented in the schema itself. The description only restates the shipmentIds cap, adding no meaning beyond structured fields — 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?

Specific verb ('Returns') plus precise resource ('FBA inbound shipment items') and a scoping constraint (up to 100 shipment IDs). The noun differs from sibling list_inbound_shipments, but the description never states that distinction explicitly, so an agent must infer it.

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 statement of when to use this versus list_inbound_shipments, no prerequisites, and no exclusions. The only guidance is the implicit constraint that it takes shipment IDs, which an agent could derive from the required parameter anyway.

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