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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world. The description adds valuable domain behavior: works are unique/small-edition, so availability can change at any time and stale answers should never be trusted. It doesn't describe the response shape, but the behavioral context is strong.

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?

Front-loads the trigger condition before the rationale and the exclusions. The middle sentence is slightly verbose but every clause carries meaning about the re-check requirement.

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?

For a single-parameter, no-output-schema read tool, the description covers trigger, rationale, and when to skip it. Only the return semantics (what 'available' looks like) are left implicit, which is a minor gap.

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 documents listing_ids (including its get_artwork provenance and 1-50 bounds). The description adds no format or batching semantics beyond what the schema provides, 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 states a specific verb+resource: re-check whether specific impressions can still be bought. It clearly distinguishes the operation from merely reading an old answer, though the term 'impressions' is domain jargon that slightly muddies the mapping to listing_ids.

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 states when to use (time has passed since a search or get_artwork answer, buyer returned later or weighing several works) and when not to (a search's offers and get_artwork are current as they answer, and checkout re-checks itself, so no call is needed in between). This is a model of when/when-not guidance with sibling references.

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