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

Annotations already declare the operation as read-only, idempotent, non-destructive, and closed-world. The description adds substantial value by disclosing the returned record contents in detail, including label composition, daily amounts, country limits, status, prices, and dates, which is especially important because no output schema exists.

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 front-loaded with the return purpose and then lists the record contents efficiently. It is a single dense sentence, so it is somewhat unwieldy, but every clause contributes useful output information without filler.

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?

Given three schema-documented parameters and no output schema, the description is largely complete because it explains what the returned product record contains. It could be slightly stronger by clarifying that the record is selected via either id or url, but the schema covers that lookup logic.

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 each parameter is already fully documented in the schema, including id as returned by search_products and url as an alternative. The description mentions country-related output but does not add syntax or fallback semantics beyond the schema.

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 uses a specific verb and resource: returns one published product record. It also distinguishes the single-record scope from search/list siblings by emphasizing one record and enumerating the record's contents.

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 does not state when to use this tool versus sibling tools such as search_products or compare_products, nor does it give prerequisites or exclusions. The intended use is only implied by the purpose statement.

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