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

No annotations are provided, so the description carries the full burden. It does disclose an external dependency (Open-Meteo) and implies a read-only lookup, but it omits side effects, rate limits, error behavior, and the fact that many schema parameters appear to be ignored or discarded.

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, compact sentence with no extraneous words. It front-loads the core action and data source, which is appropriately concise for a simple 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?

Given 10 optional parameters, no output schema, and no annotations, the one-sentence description is insufficient. It does not tell the agent which parameter to supply, what the response format will be, or how to handle the many unrelated schema fields, making correct invocation uncertain.

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. The description adds no meaningful parameter semantics beyond what the schema already provides—it only implicitly points to 'city' without clarifying relationships or resolving why most other fields are unrelated to weather.

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 action and resource: retrieving the current temperature for a city via Open-Meteo. It is clear on its own, but it does not explicitly differentiate itself from sibling tools like geo-hint, and the 10-parameter schema with many unrelated fields muddies the tool's scope.

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?

There is no guidance about when to use this tool versus alternatives such as geo-hint or timezone, nor any when-not-to-use conditions. The single-sentence description simply states the action, leaving all usage decisions to the agent.

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