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

Annotations already declare read-only, non-destructive, open-world access, so the description doesn't need to restate safety. It does add the useful fact that the response includes vessel, volume and metrics — valuable since there is no output schema — plus the underlying endpoint. Missing only error/not-found behavior.

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 compact clauses, front-loaded with what is returned and followed by the alternate identifier and endpoint. Nothing is redundant and no sentence is wasted.

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 single-entity read with fully documented parameters and no output schema, the description covers identity and returned fields adequately. It leaves the id/barcode relationship and not-found behavior ambiguous, which is the only real gap.

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%, so the baseline is 3. The description does clarify that barcode is an alternative identifier to product_id, but that clarification actually conflicts with the schema, which marks product_id as required and never indicates the two are interchangeable — a mild inconsistency rather than added precision.

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 ('One wine product by id') and enumerates what comes back ('its vessel, volume and metrics'), which clearly separates it from the list_products sibling. It stops short of naming that sibling explicitly, so the differentiation is inferable rather than stated.

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 parenthetical '(or by vessel barcode)' tells the agent about a second access path, which is real usage guidance. But there is no statement of when to prefer this over vintrace_list_products or vintrace_lookup_stock_item, and no prerequisite/exclusion guidance.

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