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

readOnlyHint=true already tells the agent this is a safe read, so the description owes additional context — but it only restates the title and appends the raw endpoint GET /baskets/<ORDER#>/history.api. Nothing is said about what a history entry contains, whether results are paginated or bounded, or whether check-ins and check-outs are separate records.

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 short sentences with no filler, and the purpose is front-loaded ahead of the endpoint reference. Slightly terse to the point of being a fragment, but nothing is wasted.

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?

No output schema exists, so the description carries the burden of explaining the return shape — yet it never says what the history consists of (event list, timestamps, quantities, ordering) or how large it may be. For a tool whose whole value is the returned history, that is a real gap.

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?

With one parameter at 100% schema description coverage, the schema already defines order_number including its integer-or-numeric-string pattern. The description adds only the '<ORDER#>' placeholder, which duplicates the schema; baseline 3 applies.

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 and scope: the check-out/check-in history of a single order, which separates it from ezrentout_get_order (order details) and ezrentout_get_asset_history (asset-centric). It doesn't explicitly name those siblings, but the resource is unambiguous.

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?

There is no guidance on when to use this versus ezrentout_get_order or ezrentout_get_asset_history, nor any prerequisites. The only implied usage comes from the words 'one order', leaving the agent to infer routing from the tool name alone.

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