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

Annotations already cover safety (readOnlyHint=true, openWorldHint=true). The description adds behavioral context beyond that: results are grouped by subcategory and paginated, and items carry live availability, which signals real-time data rather than a static catalog. Useful added context, though it doesn't mention rate limits or result-size ceilings.

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 sentences, zero filler, and the core purpose is front-loaded ahead of the routing hint. Every clause earns its place.

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?

An output schema exists, so return-value details are not the description's burden. Scope, routing and the pagination/live-availability nature are covered; completeness is high though the description doesn't clarify what subcategory groups look like beyond the schema.

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 skip, limit, store_id, category_id and subcategory are all documented in the schema itself. The description adds only high-level context ('paginated items') without new per-parameter meaning, 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 ('Fetch one 7NOW store category's subcategory groups') plus scope qualifiers ('paginated items and live availability'). It also names the siblings it is not, so an agent can distinguish it from sevennow_categories and sevennow_catalog without opening schemas.

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?

Explicitly routes the agent to alternatives: use sevennow_categories to discover categories and sevennow_catalog for the full catalog. It gives clear conditions for the alternatives but does not state explicit exclusions for this tool itself, so it falls just short of a full 5.

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