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 the useful domain-pinning note ('pinned to https://www.kyliecosmetics.com'), which tells the agent the source of truth, but says nothing about auth, rate limits, or error behavior when a handle is unknown.

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 tight sentence with zero filler, and the identifying detail (handle lookup) is front-loaded before the domain pin. It is appropriately sized for a one-parameter lookup tool.

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 annotations cover the read/open-world profile. However, for a tool sitting among nine kyliecosmetics siblings, the absence of any routing guidance leaves a genuine gap in helping the agent pick it correctly.

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 'handle' parameter is already documented as a required URL slug. The description's 'by handle' wording reinforces the schema but adds no format examples, case sensitivity, or slug-construction guidance beyond it.

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 gives a specific verb+resource ('product detail') and the lookup key ('by handle'), so an agent knows this retrieves a single product rather than listing them. It does not explicitly distinguish itself from the sibling 'kyliecosmetics_products', but the singular/plural naming carries most of that load.

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?

There is no statement of when to use this versus kyliecosmetics_products, kyliecosmetics_search_suggest, or kyliecosmetics_product_recommendations. The 'by handle' phrasing implies a direct-slug lookup, but no conditions, prerequisites, or alternatives are spelled out.

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