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

Annotations already cover the safety profile (readOnly, idempotent, closed-world, non-destructive), so the description's job is to add operational context, which it does by disclosing the return payload: specs, location, cheapest live price, product page and cart link. It hints that price is live/dynamic, though it says nothing about result ordering or what happens when zero products match.

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?

Three sentences with zero filler: capability and filter set first, return payload second, sibling routing last. Every sentence carries distinct information and nothing is repeated from the annotations.

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 six optional parameters, no output schema and no enums, the description carries the burden of both input framing and result shape, and it covers both. The only omitted detail is pagination/ordering behavior, which is minor for an optional-everything search tool.

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 coverage is 100%, so the baseline is 3; the description earns more by grouping the parameters into a coherent filtering model (keyword + category + location + max monthly price) and clarifying that max_price is a monthly-equivalent ceiling. It also frames category in terms of the list_categories sibling, which the schema only mentions in passing.

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 ("Keyword search over every GlobalHostia hosting, server, SSL and email plan"), enumerates the filter dimensions, and names the product families covered. An agent can distinguish it from recommend_plan and get_product without opening any 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?

Gives an explicit routing rule: "Prefer recommend_plan when the user describes a need rather than keywords", which supplies both the when-not condition and the alternative. The schema's query description reinforces the keyword-vs-browse split ("Leave empty to browse a category").

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