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

No annotations are present, so the description carries the full burden of behavioral disclosure. It indicates a read-only weather lookup via Open-Meteo, which suggests no mutations or side effects, but it does not disclose response format, units, network dependencies, or error behavior. This is minimal but acceptable for a simple weather hint.

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 description is a single, succinct sentence that communicates the core purpose and the data source with no wasted words. It is appropriately sized for a simple hint tool.

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?

The description is sufficient for understanding the basic purpose, but it does not specify which parameter is required, the return format, or temperature units. The schema partially compensates by describing the 'city' parameter, but without an output schema or explicit invocation guidance, an agent must infer some details.

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?

The input schema already provides detailed descriptions for all parameters, including clarifications that many are discarded after shape checks. The tool description adds little beyond naming the city as the relevant input. With high schema description coverage, the baseline of 3 is appropriate.

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 clearly states that the tool provides the current temperature for a city using Open-Meteo, which identifies both the resource and the subject matter. It does not use a explicit verb like 'returns' or 'gets', but the intent is unambiguous and it is easily distinguishable from sibling hint tools such as geo-hint or lib-docs-hint.

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 implies use when an agent needs current temperature for a city, but it provides no explicit guidance about when to prefer this tool over alternatives or when not to use it. It also does not mention any sibling tool names, so routing decisions rely on inference from the tool name and description.

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