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 not mention that the tool likely performs an external network call, that all parameters except 'city' may be discarded, or any side effects or limitations such as missing city data.

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 concise and immediately understandable. It lacks a more structured format such as 'Returns...' or 'Use with...', but it is not bloated or redundant.

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 the schema has nine optional parameters and no required fields, the description is incomplete. It does not explain which parameter is needed, why the other parameters exist, or what happens if none are provided. The absence of an output schema is not the issue; the input ambiguity is significant.

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% with descriptions for all parameters, so the baseline is 3. The tool description itself adds no parameter-level meaning, and the schema includes several seemingly unrelated parameters, which is confusing, but the individual parameter descriptions provide some semantic information.

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 the tool provides current temperature for a city via Open-Meteo, which distinguishes it from sibling tools. It could be more explicit with a verb like 'returns' or 'fetches', but the core purpose is unambiguous.

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, and no indication that the 'city' parameter is the relevant input or that other parameters are ignored. The description names the service but does not explain invocation context.

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