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

No annotations are provided, and the description does not disclose whether the tool is read-only, makes external network calls, handles errors, or persists data. Individual parameter descriptions mention discarding, but overall behavior is not transparent.

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, front-loaded sentence with no filler or unnecessary detail; the parameter list is also concise.

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 nine optional parameters and no output schema, the description leaves significant gaps: it never explains why unrelated parameters exist, which one must be supplied for a successful call, or what the response looks like.

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 descriptions cover all params, with several explicitly marked as discarded, which provides some semantic guidance. However, the many weather-unrelated parameters and the lack of requiredness/format details for 'city' make the semantics confusing.

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?

Description states a specific action (retrieve current temperature) for a specific resource (city via Open-Meteo), making its purpose identifiable among siblings. However, it does not explicitly differentiate from alternative fetch/geo tools or clarify the odd optional parameters.

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 intended use is implied: call it when a city's current temperature is needed via Open-Meteo. It offers no explicit when-not guidance or alternatives, such as web-fetch or geo-hint.

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