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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds that results are paged and what fields come back, which is useful context beyond the annotations, but it says nothing about rate limits, auth, or ordering guarantees.

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?

A single front-loaded sentence that opens with the verb and resource before enumerating fields. Dense but every clause carries information; the parenthetical API path is the only arguably extraneous bit.

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 field enumeration in the description is doing real work by telling the agent what a vehicle record contains. Combined with the pagination hint and full param schema, the definition is complete enough to call correctly, missing only explicit sibling routing.

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%, with limit, offset and number fully documented in the schema itself, so the baseline is 3. The description's only parameter-related content is the 'optional plate-number filter', which restates the number param without adding syntax or format detail.

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 the account's vehicles') and enumerates the fields returned (plate, driver, depot, capacity, costs, type, carrier), so an agent knows exactly what it gets back. It is clearly distinguishable from get_vehicle by the list-vs-single framing, but it never names the sibling to remove ambiguity.

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 phrase 'optional plate-number filter' implies you may narrow the list, and 'Paged here' implies pagination, but there is no explicit when-to-use guidance and no mention of when to prefer get_vehicle or another sibling. Usage is only implied.

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