product

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the meaningful scope constraint that exactly one product is returned per ASIN, but says nothing about missing/invalid ASIN behavior or any lookup constraints.

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 naming the returned fields and the key parameter; there is no filler. It is arguably terse to the point of under-specification rather than bloated.

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?

The tool takes one simple identifier and an output schema exists to describe the return shape, so the description need not explain response values. For a single-param read tool this is nearly complete; only the not-found case is unaddressed.

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?

Only one parameter exists and the schema provides no description for it (0% coverage). The description compensates somewhat by clarifying 'asin' identifies a single product and hinting where such an identifier originates ('from orders'), but gives no format or validation 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 concrete resource (one product by ASIN) and the exact fields returned (title, price, availability), so an agent knows this is a catalog lookup rather than a cart or order operation. It does not explicitly name a sibling to distinguish itself from, which keeps it just short of a 5.

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 parenthetical '(e.g. from orders)' implies the typical workflow: the ASIN comes from an order, then this tool enriches it. That is a useful but implicit usage cue; there is no explicit when-to-use/when-not statement or named alternative among the siblings.

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