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

readOnlyHint=true already tells the agent this is a safe read. The description adds one genuinely useful behavioral trait — results are returned most recent first — plus the underlying GET /shipments endpoint, but says nothing about pagination mechanics (cursor semantics for after_id/before_id) or result limits.

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, no filler, with the primary purpose and result ordering front-loaded before the endpoint detail. Every clause carries information.

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?

For a zero-required-parameter list tool with a fully documented schema and readOnlyHint, the description covers purpose, ordering, pagination existence and filters. Only the pagination mechanics are left implicit, which is a minor gap given no output schema exists to explain result shape.

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 all six parameters are already documented with format context (ISO 8601 bounds, max page size, cursor ids). The description only refers to 'optional filters' generically and adds no meaning beyond the schema, which is the baseline case.

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 ('List shipments on the account') plus ordinality and pagination/filter behavior, which clearly distinguishes it from get_shipment and the create/buy siblings. It stops short of explicitly naming sibling alternatives, so it is clear but not fully differentiated.

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?

Usage is only implied: an agent can infer this is the collection-read tool while get_shipment fetches one record. There is no explicit 'use this when...' guidance or exclusion criteria against the other list_* tools (addresses, trackers).

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