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 intent semantics (related vs complementary) and result capping, but says nothing about return volume, pagination, or whether recommendations are personalized/derived from the catalog. With annotations carrying the core behavioral load, 3 is appropriate.

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, front-loaded with the action and seed, followed by the routing guidance. No filler or repetition.

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?

Output schema exists so return values need not be explained, parameters are fully documented, and annotations cover safety. The description supplies the seed-discovery prerequisite and sibling routing, which is everything needed to invoke 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 coverage is 100% and every parameter is already documented in the schema, including the limit default/max and intent allowed values. The description only restates roles ('intent chooses related or complementary', 'limit caps results') without adding syntax or edge-case meaning beyond the schema. Baseline 3.

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 (Fetch) and resource (recommended product items) plus the seed input that defines it, and 'product items' plus 'recommendations' clearly distinguishes it from fashionphile_product, fashionphile_products, and fashionphile_search. An agent can identify the operation without opening the schema.

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?

Names both prerequisite and alternative workflows explicitly: use fashionphile_product or fashionphile_products to discover a seed, and fashionphile_search for full-text filters. This tells the agent when this tool fits and which siblings handle the adjacent jobs.

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