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

Annotations already establish read-only/non-destructive/open-world, so safety is covered. The description adds value beyond them by disclosing the paging model ('Returns one page (keyset paging: pass next_cursor as start_cursor)') and the underlying endpoint, which an agent needs to page correctly.

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 compact fragments: purpose, endpoint, and paging behavior. Zero filler, and the most decision-relevant information (what the statuses are and why to fetch them) comes first.

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 no output schema, the description carries return-shape burden and does so adequately: one page plus the next_cursor contract. Safety profile is handled by annotations. Minor gap is the absence of any note on rate limits or how many statuses typically exist.

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% and each of the five params is documented there, so this is the baseline case. The description's cursor note largely restates the schema's start_cursor text rather than adding new syntax or constraints.

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 precise verb+resource ('Lookup: the vehicle statuses...and their ids') and gives concrete example values (Active, In Shop, Out of Service), which separates it cleanly from siblings like fleetio_list_work_order_statuses and fleetio_list_vehicle_types. The purpose for the caller ('for filtering vehicles') is explicit.

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?

The description clearly frames when to reach for this tool: when you need status ids to filter vehicles by status. It does not name alternatives or state when-not to use it, but the use case is unambiguous enough that an agent can place it.

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