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

No annotations are provided, so the description carries the full behavioral burden. 'Lists' implies a read operation, but nothing is said about permissions, pagination, response shape, or how results are scoped when product_id is supplied. For a tool with zero annotation coverage this is a notable gap.

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 the core purpose front-loaded and no filler. Nothing is wasted, though the second sentence is more marketing-flavored than operational.

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 one-parameter read tool with no output schema, the description is minimally adequate, but it omits what the returned values look like (e.g., distinct tag strings) and the required nature of the product_id filter. An agent would still have to inspect the schema to call it correctly.

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 product_id is documented in the schema itself. The description adds no meaning beyond that—it never mentions that product_id is required or how the array filter behaves—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 and resource: it lists custom label values (tags) attached to products. The phrase 'in the master catalog' implicitly distinguishes it from the drop-product sibling listDropProductLabelValues, but no sibling is ever named.

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 second sentence offers a use case ('finding product categories, materials, or other custom attributes') but gives no when-to-use versus alternatives guidance, no prerequisites, and never mentions the sibling tools that also list label values. An agent must infer routing on its own.

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