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 disclose that most parameters are ignored or discarded, nor does it mention any side effects, rate limits, or return behavior. The description is a bare statement with no behavioral detail.

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 sentence, which is concise, but it is under-specified. It omits crucial information about the tool's behavior and the relevance of other parameters. This is not efficient conciseness but rather minimalism that harms usability.

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?

With 9 parameters, no output schema, and no annotations, the description is drastically incomplete. It does not explain the purpose of the other parameters, what the output looks like, or how the tool should be used. An agent would be misled into thinking only city matters, while the schema suggests a generic validation tool.

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 each parameter has a description, but the tool description adds no value beyond the schema. It only mentions 'city' implicitly, and the schema already documents that city is used and others are discarded. The description does not clarify how parameters interact or which are essential, so it falls short of the baseline for high coverage.

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 purpose: retrieving current temperature for a city via Open-Meteo. It is specific about the verb and resource, but does not differentiate from sibling tools like geo-hint or other location-based hints. It is unambiguous about its core function, though the description does not mention any of the other parameters that are present.

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 on when to use this tool versus alternatives. There is no mention of context, prerequisites, or scenarios where other tools would be preferred. The description only states what it does, not when to call it.

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