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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered. The description adds genuinely useful behavior beyond that: the storefront URL is fixed server-side, and empty result pages still return 200 with an empty products array, which prevents an agent from treating an empty list as an error.

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?

Front-loads the purpose, then behavioral notes, then parameter restatement and the sibling pointer. Mostly efficient, though the limit/page restatement duplicates the schema and could be trimmed.

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 an output schema present, return-value detail is unnecessary, and annotations cover the safety profile. The description adds the empty-page behavior and sibling routing, leaving only minor gaps (e.g., relation to collections/collection_products siblings).

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%, so both parameters are already fully documented. The description restates limit (default 50, max 250) and page (1-based, default 1) verbatim from the schema, adding no new syntax or semantic detail. Baseline 3 is correct when the schema does the heavy lifting.

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 ('Returns') and resource ('normalized products from Rothy's public product catalog'), and explicitly distinguishes itself from the sibling rothys_product (single product). An agent can route between the two without opening either schema.

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?

Provides clear usage context by naming the alternative ('Use rothys_product to get a Rothy's product'), which tells the agent when to prefer a single-item lookup. It does not address the other related siblings (collections, collection_products), so exclusions are partial rather than exhaustive.

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