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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds only a small amount beyond that: 'compatible devices as written by the store' signals unnormalized free-text, and the add-to-cart URL hints at embedded commerce links. No pagination, caching, or not-found behavior is described.

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 sentences, zero filler, with the payload description front-loaded and the usage rule trailing as a compact clause. Nothing is redundant.

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?

A read-only single-record fetch with an output schema present, so return-value structure is handled elsewhere. The description covers what it returns, when to call it, and what its input refers to — everything an agent needs before invoking.

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% and the single parameter is documented as 'Product id from search_products', so the baseline is 3. The description's 'one product' and 'after search_products' reinforces provenance of the id but introduces no syntax, format, or validation detail the schema lacks.

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 ('Get full details of one product') and enumerates exactly what comes back: description, price, stock, SKU, compatible devices, FAQ, add-to-cart URL. An agent can distinguish this single-item lookup from search_products or compare_products without opening any schema.

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?

Gives an explicit sequencing cue: 'Use after search_products when the user asks about a specific product.' That covers the primary entry path and names the sibling that feeds it, but no negative guidance (e.g. not for browsing or bulk comparison) is offered.

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