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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds the payload contents but says nothing about behavior an agent would care about, e.g. what happens when the SKU is unknown, whether the product link form redirects or normalizes, or whether stock data is live.

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 dense sentence with the resource front-loaded and zero filler; every clause names a returned field. It is telegraphic rather than a complete sentence, 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?

This is a simple one-parameter read tool with full annotation coverage and an output schema, so the return-value inventory is somewhat redundant with the output schema and the words could have been spent on sibling differentiation and not-found behavior instead. Adequate, but not tuned to what the agent actually lacks.

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 and schema description coverage is 100%, with the schema itself explaining the SKU format and the alternative product-link form. The description adds no constraint or format detail beyond that, so the 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 verb ('full details') and resource ('one product') plus an itemized list of what comes back, so an agent can distinguish it from a list/search tool. It does not name or distinguish itself from the actual siblings (search_products, check_price_and_stock), so it stops 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 phrase 'for one product' implicitly contrasts with search_products, and the schema's required SKU implies lookup-by-identifier, but the description never says when to use this versus check_price_and_stock (which also returns price and stock) or search_products. Usage is inferable rather than stated.

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