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

Annotations already declare readOnly, idempotent, open-world and non-destructive, so the safety profile is covered. The description adds genuine extra context: the returned field set and the cost model ('1 point per returned record'), which is a meaningful behavioral trait not present in any structured field.

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 compact sentences, front-loaded with the deliverable content and then the cost. Nothing is wasted, though the field list is a bare enumeration rather than organized in a way that maps to the request.

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 annotations carrying the safety profile, a fully-covered schema and no output schema, the description closes the loop by disclosing the return field set and point cost. It is essentially complete for a listing tool, missing only explicit sibling routing.

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 user, domain, max_items and start_page are already documented in the schema. The description adds nothing about parameter formats or how max_items interacts with pagination or point cost, 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?

The description specifies the resource precisely: a Vinted member's current wardrobe items, with the fields returned (title, prices, brand, size, condition, photos, flags). An agent can distinguish it from run_vinted_users (the member profile) and run_vinted_products_search (catalog search). It falls short of a 5 because it never names or contrasts itself with those siblings.

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 explicit when-to-use, when-not-to-use, or alternative routing. It does not say to use this when you have a member and want their listings versus run_vinted_products_search for keyword search, leaving the agent to infer the split from sibling names alone.

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