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

There are no annotations, so the description carries the full burden of behavioral disclosure. It only says 'via Open-Meteo', implying a network call, but does not state whether the operation is read-only, what happens to the various inputs (some are described as 'discarded' in the schema), whether there are rate limits, or what the response format is. The description adds minimal behavioral context beyond the schema.

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 extremely concise—a single sentence with no wasted words. However, it is under-specified, not concise in the sense of packing essential information. It earns a 3 because it is short and front-loaded, but the brevity comes at the cost of clarity.

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 tool has 9 optional parameters, no output schema, and no annotations. The description does not explain the output format, which parameters are relevant, or how to construct a valid request. Given the complexity and the lack of structured help, the description is severely incomplete.

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, but the description does not add meaning beyond the schema. More importantly, it does not identify which of the 9 parameters is used to determine the place, and the schema descriptions themselves are confusing (e.g., 'city' says 'for a public weather hint' which contradicts the geo purpose). The description fails to compensate for this ambiguity.

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 clear output (latitude and longitude for a place) and a data source (Open-Meteo), but it is ambiguous about how the place is specified. The tool name 'geo-hint' and the sibling set include weather-hint, so the purpose is somewhat distinct, but the description does not clarify which parameter carries the place (e.g., city, query, or another).

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 provides no guidance on when to use this tool versus alternatives. With 27 sibling tools including weather-hint and lib-docs-hint, there is no statement about scenarios, exclusions, or conditions that would route an agent to this tool instead of another.

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