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

With no annotations, the description carries the full burden and does a fair job: it discloses brand neutrality, a 6-hour price refresh cadence, the exact ranking logic (lowest-ever tracked price first, then largest drop below tracked high), and conditional inclusion of a budget-guide link. It omits auth/permission needs and behavior when nothing matches the budget.

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?

The examples are front-loaded effectively, but the core sentence is a long run-on with a densely nested ranking parenthetical that is hard to parse on first read. The ranking detail is useful but could be broken into a shorter, cleaner statement.

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 no output schema and no annotations, the description still conveys what a result set looks like: models of the requested type plus a budget-guide link when available, ordered by the stated ranking. It is nearly complete, missing only result field detail and empty-result behavior.

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 category, max_price and limit are already documented, making 3 the baseline. The description adds modest value by clarifying that the budget filter is applied to each model's current lowest new UK price, but it offers no extra detail on limit or category beyond what the schema states.

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+resource: it returns every tracked model of a given category whose current lowest new UK price falls within a budget, ranked by value. This clearly separates it from lookup-oriented siblings like get_golf_price and compare_golf_prices, though it never names those siblings explicitly.

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 opening examples ("best driver under £300", "golf balls under £30 a dozen") give concrete triggers for when this tool is the right call, and the budget framing implies it is the discovery tool rather than the single-price or comparison tools. No explicit when-not or named alternatives are provided.

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