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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds that this returns one product's record including variants and related products, which is mild scoping context, but it discloses nothing about failure modes, id validity, or freshness beyond what annotations and the output schema carry.

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?

A single compact sentence that front-loads the resource and then lists contents with zero filler. It is slightly telegraphic, using a noun phrase with no verb, which costs a point against the most polished definitions.

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-only detail tool with an output schema and annotations, the description covers the essentials: what entity it returns and what fields that record spans. Nothing critical for correct invocation is missing, though it could say more about when this beats a search/category call.

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 product_id parameter is fully documented in the schema, including its origin endpoints. The description adds no syntax, format, or id semantics beyond that, so the baseline 3 for schema-driven parameters 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?

The description names a specific resource ('One 7NOW product's full reference record') and enumerates its contents, so an agent can tell this is a single-item detail lookup rather than a list/search tool. It does not explicitly name a sibling like sevennow_search or sevennow_category to sharpen the contrast, so it falls short of a 5.

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?

Usage is only implied: a 'full reference record' for one product signals a detail lookup after an id has been obtained elsewhere. There is no explicit when-to-use, when-not-to-use, or named alternative among the many sevennow_* siblings, so it stays at minimum-viable implied guidance.

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