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

With no annotations, the description carries the full burden. It usefully discloses that products outside the directory are handled by returning closest topic-based listings, which is meaningful behavior beyond the schema. However, it says nothing about permissions, rate limits, result shape, or whether the limit parameter truncates results.

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 compact, front-loaded with the core purpose, and every clause adds information. It could be organized slightly more clearly, but there is no padding.

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 two-parameter retrieval tool with no output schema, the description explains accepted input forms and fallback behavior but leaves gaps around return values and the role of the limit parameter. An agent can invoke it, but cannot fully predict the response shape.

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 50%, so the description must compensate. It does well for the 'product' parameter by explicitly listing slug, URL, or name and explaining the out-of-directory fallback. It adds no semantic meaning for 'limit' beyond what the schema's default and bounds already convey.

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 resource, alternatives and competitors for a given product, which is clearly distinct from sibling tools like search_listings, compare, or get_listing. It does not explicitly name or contrast with those siblings, keeping it just short of a 5.

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 purpose implies usage (find competitors for a product), but there is no explicit when-to-use or when-not-to-use guidance relative to alternatives such as search_listings or discover. The fallback note is more behavioral than a usage rule.

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