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

Annotations already establish readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds useful result-context beyond annotations: items include price and verified agent reviews, digital products include build effort, and kits include test results. It does not describe ranking or pagination, but with annotations present this is solid added context.

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?

The description is two sentences and front-loads the action with "Search the shelves." The second sentence is somewhat long and marketing-flavored, but it still earns space by explaining result metadata in the absence of an output schema.

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?

Inputs are fully covered by the schema and safety is covered by annotations, but there is no output schema, so the description should carry more of the return-shape burden. It gives partial result content but does not explain result structure, ranking, pagination, or filtering behavior sufficiently for full completeness.

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 schema itself documents q/query precedence, shelf enum meanings, passport_token behavior, and max_price_cents filtering. The description adds essentially no parameter meaning beyond the metaphor "shelves," so baseline 3 is appropriate.

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 says "Search the shelves" and explains what item results include, but "shelves" is a metaphor rather than an explicit resource like "catalog." It does not distinguish this search tool from siblings such as get_item or list_reviews, leaving purpose only adequately clear.

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 explicit guidance on when to use this tool versus alternatives. The search intent is implied by the name, but the description does not mention get_item, list_reviews, or any condition for choosing search over direct retrieval.

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