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

Annotations already establish readOnlyHint=true and openWorldHint=false, lowering the bar. The description usefully adds in-stock-only filtering, Lebanon geography, a 10-result cap, and heuristic ranking for laptops, but says nothing about sort exclusivity (is it strictly ascending price?), tie-breaking, or empty-result behavior.

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 short sentences with the core purpose front-loaded and no filler. The parenthetical aside is slightly awkward but does add ranking context rather than 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 read-only, single-category filter tool with no output schema, the description covers stock status, geography, result cap, and optional filters. Only minor gaps remain around exact ordering semantics and return contents, which are low-stakes here.

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 only 25%, so the description must compensate. It loosely maps all four parameters: 'budget' to max_price_usd, 'brand' to brand, 'up to 10 results' to limit, and category via the enumerated scope. Still, it gives no format details for max_price_usd (USD? filters cheap-but-above-budget items?) beyond the passing mention.

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 verb (find the cheapest) and resource (in-stock products in a category), so the agent can distinguish it from search_products or get_product_prices. The parenthetical about laptops ('cheapest among sensible, new machines first') is somewhat cryptic but still signals category-specific ranking logic.

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 through scoping phrases like 'currently in stock', 'optional budget and brand', and 'up to 10 results', which hint at when the tool fits. However, it never explicitly contrasts itself with the sibling tools get_product_prices, price_history, or search_products, leaving the agent to infer the boundary.

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