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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive), so the description correctly spends its budget on content-level behaviour: what is included (blocking errors and warnings), what is excluded (plain non-buyable listings counted separately), and that the `narrative` field carries the answer. It adds real context beyond the annotations, though it says nothing about scope/limits or freshness of the Amazon data.

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?

Three sentences, front-loaded with the core definition before the exclusion and the example queries. Every sentence is useful, though the embedded user-phrase list is slightly redundant with the examples already given.

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?

There is no output schema, so the description carries the burden of describing the return payload, and it does: Amazon's own message per SKU, open listing deadlines, and the `narrative` field as the primary answer. Combined with the inclusion/exclusion rules, an agent has enough to call it correctly.

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?

Only one optional parameter and schema description coverage is 100%, so the schema already explains `marketplace_id` fully. The description adds nothing about the parameter, which is acceptable at baseline 3 but no better.

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 resource (listings) and scope (those with Amazon-reported errors/warnings, plus open deadlines), and explicitly separates a neighbouring case: 'A listing that is simply not buyable (often no stock) is counted separately, not reported as a problem.' An agent can distinguish this from get_buybox_status 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?

Gives concrete when-to-use triggers in the user's own words ('are any of my listings suppressed', 'listing errors', 'why can't my product be bought'), which is strong routing guidance. It does not, however, name an alternative sibling tool or state when not to use this one, so it stops short of a 5.

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