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

Annotations already declare readOnly/non-destructive/openWorld, so the bar is lower; the description still adds real context by confirming nothing is committed ('without selecting one'), noting that all pages are returned, and disclosing that transportation quotes carry expiration and void deadlines while self-ship appointments are only available 'where Amazon supports them'. Permission/auth requirements and empty-result behavior are not covered in the description.

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?

Two sentences, front-loaded with the essential read-only framing and back-loaded with the option-family inventory. The long enumeration is dense but each clause earns its place by distinguishing output families; the trailing prerequisite sentence is slightly detached from the opening.

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 an output schema present, return shapes need not be explained, and the description still usefully previews the option families. It covers the generation prerequisite, the no-selection guarantee, and pagination, leaving only auth/permission prerequisites and error/diagnostic behavior unstated.

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%, so the baseline is 3, but the description goes further by mapping each option_type family to the payload it yields (packing fees, placement per-split fees/discounts, transportation carrier/mode/quote, delivery window validity, appointment slots), which tells an agent what to expect from the enum choice. It does not add anything about shipment_id scoping or the packing_group_id/placement_option_id refinements beyond what the schema already documents.

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?

Starts with a specific verb and resource ('Read Amazon-generated FBA inbound options') and immediately scopes them ('without selecting one'), then enumerates the four-to-five option families the tool returns. It also names the generator sibling (prepare_fba_inbound_options), so an agent can separate reading from generating without opening either schema.

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?

Clear context: this is the read-only inspection step, and options must exist first via prepare_fba_inbound_options, which is an explicit prerequisite. It does not state when to prefer this over sibling readers such as get_fba_inbound_plan or get_fba_inbound_operation_status, so routing among the reading tools is left to inference.

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