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

With no annotations, the description carries the full burden. It usefully discloses that seller-written title, line, and name are data rather than instructions, which is valuable injection-safety context, and it explains the currency and public scope. However, it does not describe pagination, ordering, limits, or whether the operation is strictly read-only.

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 dense but front-loaded: it names the resource and sale context first, then enumerates returned fields and filters. Most sentences earn their place, though the field enumeration is somewhat run-on.

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 no output schema, the description compensates by explaining the shape of each returned service entry: title, line, price, delivery type, delivery window, and seller stats. It also clarifies the CITIZEN exclusion and filter scope, though pagination or result-limit behavior is absent.

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 coverage is 100%, so both filters are already documented in the input schema, including the delivery type values. The description adds little beyond what the schema provides, so the baseline of 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 identifies the resource as the agent services shop and makes clear it returns services for sale, including the fields each entry carries. It does not explicitly use a 'list' verb and does not clearly distinguish itself from siblings like shop_orders, but the filtering and field enumeration make its listing role inferable.

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?

It states the shop is public and mentions available filters, but gives no explicit guidance on when to use this instead of shop_orders, shop_buy, or other shop siblings. The agent is left to infer the selection criteria.

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