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 what the record contains (contact details, hours, photos) but says nothing about failure behavior for an unknown slug, photo counts, or whether results vary by locale/region.

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 tight sentences: the payload is front-loaded and the parameter provenance follows. No filler, no redundancy.

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?

With an output schema present, the description need not explain return values, and for a single-parameter detail tool it covers resource, contents, and the source of the identifier. Only the routing distinction versus gucci_store_search is left unaddressed.

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 slug parameter is already documented in the schema. The description's slug sentence essentially repeats the schema's own text, adding no syntax, format, or lookup guidance beyond it, 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 resource ('One Gucci store's full detail') and enumerates the returned fields (name, phone, address, opening hours, photos), so an agent knows exactly what it gets. It implicitly contrasts with the list-oriented gucci_stores by naming it as the slug source, though it never explicitly distinguishes itself from gucci_store_search.

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 sentence 'slug comes from gucci_stores' own slug field' implies the precondition (you must first obtain a slug from the list tool), which is useful implied usage guidance. However, there is no explicit when-to-use/when-not statement and no mention of gucci_store_search as an alternative route to a store.

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