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

Annotations already declare a read-only, idempotent, closed-world, non-destructive profile, so the safety burden is covered. The description adds only the curation trait that results span 'different moments,' which is modest extra context; it says nothing about how overlaps with avoid/size are resolved.

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 front-loaded sentence with zero filler, clearly stating output size and the personalization anchor. It is efficient, though its brevity borders on under-specification given the available space.

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 and all four parameters fully described in the schema, the description need not explain return values or parameter formats. It remains incomplete on routing against similar sibling tools, which is the one thing structured fields cannot supply.

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 the schema already documents loves, avoid, size, and lang with defaults, bounds, and enum. The description's 'built around what the person already loves' and 'three to five' loosely echo two parameters but add no syntax or format detail beyond the schema, which is the expected baseline.

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 states a concrete output (three to five perfumes) and the curation logic (cover different moments, built around what the person already loves), so an agent grasps the purpose immediately. It does not, however, differentiate itself from plausibly overlapping siblings such as occasion-edit or scent-neighbours.

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 when-to-use guidance, no exclusions, and no named alternative. The agent must infer that this tool is for building a multi-perfume set from existing favorites rather than for a single lookup or edit, but nothing in the text says so explicitly.

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