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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered. The description adds one useful behavioral detail — that results include prices — but says nothing about ranking basis, result count behavior, or what happens when no similar products exist.

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 tight sentences with zero filler. The value proposition (similar products + prices) is front-loaded, and the accepted input forms follow immediately.

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 simple two-parameter read-only tool with full schema coverage and annotations covering the safety profile, the description is adequate — it even hints at return content (prices), which matters since no output schema exists. It is only slightly short on how similarity is determined and what an empty result looks like.

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 description coverage is 100%, and the schema already defines both 'product' (url, slug, or name) and 'limit' (1-15, default 6). The description's 'Accepts a product url, slug or name' simply repeats the schema, adding no new syntax or matching-precedence guidance. 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 resource and behavior: returns products most similar to a given one, along with their prices. This is clearly distinct from get_product (single lookup) in intent, though it never names a sibling to route between them. Clear but no explicit sibling differentiation.

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 'to compare or suggest alternatives' implies a recommendation/comparison use case, but there is no when-to-use vs when-not guidance and no mention of search_products as the alternative for keyword-driven discovery. Usage is implied rather than stated.

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