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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the useful context that results are pinned to https://store.psacard.com, but says nothing about caching, rate limits, or lookup-miss behavior.

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 no waste. It is appropriately sized, though the brevity comes at the cost of any routing or usage detail.

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?

The tool is simple (one required param) and an output schema exists, so return values need not be explained. However, with such a crowded sibling namespace, the description stops short of telling the agent how this detail fetch relates to the sibling list/search tools.

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 single 'handle' parameter is fully described in the schema as a required URL slug, so the schema carries the burden. The description adds no format or syntax detail beyond it, which matches the baseline 3.

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 verb and resource ('product detail by handle'), so an agent can tell this is a single-item lookup. It doesn't differentiate from the dense set of sibling *_product tools (e.g. psastore_products, psastore_collection_products), but the resource and retrieval key are unambiguous.

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?

No when-to-use, when-not-to-use, or alternative routing is given. The handle-based nature implies a detail lookup after search, but nothing tells the agent to call psastore_products or psastore_search_suggest first. Guidance is entirely absent.

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