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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds the exact HTTP route, which is mildly useful context, but says nothing about error behavior for missing ids, rate limits, or auth expectations.

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?

One dense sentence plus the endpoint, front-loaded with the lookup key. The long field enumeration is informative rather than filler, though the trailing 'and more' weakens the precision of the list.

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 read tool with no output schema, enumerating the returned fields (title, category, prices, VAT, stock, EAN, weight, availability, manufacturer) is exactly the compensating context an agent needs to decide whether this call suffices. Only the id-provenance guidance 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?

Schema description coverage is 100% and the single parameter already states 'Sellasist product id.' with a positive-integer bound. The description's 'by id' adds nothing beyond that, so the schema carries the full load — 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?

Specific verb+resource+lookup key: 'One product by id', followed by an enumeration of the fields returned and the underlying endpoint GET /products/{product_id}. It is clearly distinct from list-style siblings by virtue of the singular lookup, though it never names sellasist_list_products as the alternative.

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?

Usage is implied: fetch a single product when you already have its id. There is no explicit guidance on where to obtain a product_id (e.g. from sellasist_list_products) or when to prefer sellasist_get_stock for stock data, both of which are reachable siblings that overlap with the fields advertised here.

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