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

Annotations already declare this a read-only, idempotent, non-destructive operation. The description adds meaningful behavioral context by specifying provenance (prices 'with its source and the date it was read') and a clear scope boundary ('No clinical advice'). This goes beyond the annotation safety profile.

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?

The description is one information-dense sentence followed by a short scope boundary. It front-loads the core action and then lists the contents in a readable order, with no filler or repetition of the schema.

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 no output schema, the description carries the burden of explaining what the agent will receive, and it does so thoroughly: address, phone, website, accreditations, services, ownership, and prices with source/date. Combined with the single self-describing parameter and rich annotations, nothing critical is missing.

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?

There is only one parameter, id, and the schema already covers it fully with a clear example. Schema description coverage is 100%, so the baseline of 3 applies; the description adds no extra parameter information, but none is needed.

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 opens with 'One PetCare Atlas listing in full', making the verb (retrieve a single full listing) and resource (PetCare Atlas listing) explicit. It then enumerates the exact content areas, which clearly distinguishes it from the sibling search tool find_providers and the targeted medicine/procedure price tools.

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?

The phrase 'One ... listing in full' and the schema note that id comes from search results convey when to use this tool: after locating a single provider. It does not explicitly name alternatives or state when not to use it, so it stops short of a 5.

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