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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, covering the safety and external-data profile. The description adds a genuine behavioral nuance — the values are live and "indicative" rather than authoritative — but says nothing about latency, rate limits, or what happens for an unknown id.

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?

A single front-loaded sentence with no filler or redundancy. It is efficient, though its brevity contributes to the ambiguity noted in other dimensions.

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?

An output schema exists, so return values need no explanation. However, for a tool sitting beside four more specific retrieval siblings, the description leaves the core selection question — what kind of search result this handles and why it is used instead of the dedicated price tools — entirely unanswered.

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 0% for the single required id parameter, so the description must compensate. It only hints that the id is a search result identifier, with no format, origin, or example, and the generic "id" must span fuel, green card, and OSCPV result types without clarification.

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?

"Fetch" largely restates the tool name, but the description does add the resource: live indicative prices or public information keyed to a search result. It fails to distinguish itself from three dedicated price siblings (get_fuel_prices, get_green_card_price, get_oscpv_price), leaving the agent unable to tell when this generic fetch is preferred over them.

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 phrase "for a search result" faintly implies this follows a search call, but there is no explicit when-to-use, when-not, or reference to any sibling. An agent facing four other retrieval tools gets no routing guidance at all.

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