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

Annotations already declare this a safe, read-only, idempotent, closed-world lookup, so the safety burden is lifted. The description still adds real value by disclosing that the company's own Copenhagen shop is always included regardless of filters, though it does not say how matching works (exact vs partial city/country, case sensitivity) or what a result entry looks like.

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 short sentences with no filler, and the core resource statement is front-loaded ahead of the filter and the Copenhagen caveat. Slightly rough grammar ("the own shop") costs it a point but 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?

For a simple two-parameter read tool with no output schema, the description is mostly sufficient, but it leaves the return payload entirely undefined and does not clarify filter-matching behavior. The important non-obvious quirk (own shop always returned) is covered, which keeps it at minimum viable.

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 50%: country has a description listing examples in English, city has none. The description echoes the English-name requirement and confirms both parameters are optional filters, which adds the OR/filter framing the schema does not express, but it contributes nothing new for the undocumented city parameter.

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?

Names the exact resource (physical shops that sell Anne Black) and its scope, which clearly separates it from product-focused siblings like get_product or search_products. The find/list verb is only implied, but the resource statement is specific enough for an agent to recognize the tool.

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?

"optionally filtered by country ... or city" implies the usage pattern (a lookup with optional narrowing), but there is no explicit statement of when to call it versus siblings, no guidance on what happens with both filters or a filter that matches nothing. 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.