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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds useful behavioral context by disclosing what data is included (description, photos, measurements, designers, seller profile) and that the output is 'normalized' rather than flattened.

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 sentences, zero filler, with the value proposition (richness vs. siblings) front-loaded and the id provenance following. Every sentence earns its place.

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?

A read-only single-parameter tool with full schema coverage and an output schema; the description covers purpose, sibling relationship, and data scope. Nothing essential is missing, though it stops short of a strict when-to-use exclusion rule.

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 the schema already describes id as coming from a search/sold-listings result's listings[].id field. The description restates the same provenance without adding new syntax or format details, 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 retrieval action on a specific resource ('Full normalized listing-detail data for one Grailed listing') and enumerates the fields returned, so an agent can tell it apart from grailed_search or grailed_sold_listings at a glance.

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?

Explicitly names the sibling summaries (grailed_search/grailed_sold_listings) and explains why this tool is preferable ('richer than the flattened summary'), which is strong routing guidance. It does not state a when-not-to-use condition, but the alternatives are clearly identified with their trade-off.

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