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

With no annotations, the description must carry the behavioral burden. It reveals only that Open-Meteo is used; it does not say whether a network call is made, what response shape is returned, how failures surface, or which input is actually consumed.

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 one short, front-loaded sentence with no filler. It loses a point only because it is too terse to carry the needed semantic context.

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?

For a tool with nine heterogeneous parameters and no output schema, this description is under-specified. An agent cannot tell which parameter to populate, what the tool returns, or how it behaves when the place is unknown.

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?

Although the schema documents all nine parameters (100% coverage), the description does not map 'a place' to the city parameter or any other parameter. The schema's city description says 'public weather hint' and 'discarded after the call,' which conflicts with the geo-lookup purpose.

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 names a concrete result — latitude and longitude for a place — and the data source, Open-Meteo. It does not, however, contrast with weather-hint or other sibling tools, so it earns a 4 rather than a 5.

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?

No guidance is given about when geo-hint is preferable to weather-hint, timezone, or other location-related tools, and no exclusions or prerequisites are stated. The only implied use is whenever coordinates for a place are needed.

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