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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile needs no restatement. The description adds real context beyond that: shipping is included in the total, the dates assume payment today, and an occasion input yields a deadline. It stops short of stating currency/units or that the estimate has no side effects or holds.

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 sentence with no filler, and the most important output (total with shipping) is front-loaded. It is grammatically a fragment rather than a complete statement of what the tool does, which costs it a point.

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 only two simple parameters, no output schema and full read-only annotations, the description carries its main load by describing what comes back — effectively substituting for the missing output schema. Minor gaps remain: currency/units of the total and whether the occasion output appears only when occasion is supplied.

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 both parameters are already documented, including the cross-reference to get_gift_box_details for occasion naming. The description contributes only the extra detail that occasion drives a 'last day to order' output; it says nothing new about the boxes parameter.

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?

The description enumerates concrete outputs: total price with shipping included, ship-by and expected delivery dates, and an occasion's last-order date. An agent can tell this is a pricing/date-estimate tool rather than an order-creation tool, but the phrasing is a noun list without an explicit verb and it never names the siblings it differs from (e.g., create_draft_order).

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: the quote is explicitly framed as being for 'an order paid today', which tells the agent the temporal assumption baked into the result. There is no statement of when this should be called instead of create_draft_order or get_gift_box_details, and no preconditions are listed.

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