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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description goes further by disclosing result behavior beyond the annotations: output is ordered cheapest-first and includes discount amounts and the marketplace's own product link, which matters since no output schema exists.

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?

Purpose is front-loaded in the first clause and the description is compact for the amount of information conveyed. The Arabic half is a near-verbatim translation, which is defensible for a bilingual marketplace but is strictly redundant text.

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 5-parameter read-only search with 100% schema coverage and clear annotations, the description covers purpose, ordering, and result content. It omits any indication of live vs cached data, rate limits, or whether an account is needed to receive 'our product links', and does not mention the product links are affiliate/owned, which would help the agent frame results.

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 the schema already documents every parameter, including the category enum and the include_accessories default. The description's category mapping largely restates what the enum and schema text already say, adding little beyond baseline.

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 ('Compare prices of phones and electronics across the marketplace's stores') and adds meaningful scope: ranked cheapest-first, with discounts and product links. It implies a cross-store comparison function distinct from a generic marketplace search, but never names the likely sibling search_souq, so sibling differentiation is left to inference.

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 description gives category-routing guidance ('Set category=phones for phones, tablets/laptops/wearables/audio/gaming likewise'), which is useful selection help, but gives no when-to-use vs when-not-to-use against alternatives such as search_souq, and no prerequisites or exclusion conditions.

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