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

With no annotations, the description must carry the behavioral disclosure burden. It only hints at an external network call via 'Open-Meteo' but does not disclose error behavior, rate limits, parameter discarding, or what happens for invalid cities. Vague and under-specified.

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 sentence with no wasted words. It is front-loaded with the main idea and easily readable.

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?

This tool has a nine-parameter schema, no output schema, and no annotations, so the context demands more explanation. The one-liner leaves unanswered the roles of the irrelevant parameters, the required input shape, return format, and failure behavior, making it inadequate for an agent to confidently invoke.

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 usefully emphasizes 'for a city,' pointing an agent to the city parameter as the operative input among the nine schema properties, adding a small but meaningful cue beyond the raw schema description.

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 sentence states a clear, specific purpose: return the current temperature for a city via Open-Meteo. It differentiates the tool from weather-related siblings by the explicit data source and city scope, but the large unrelated parameter schema creates confusion that the description does not address.

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 on when to use weather-hint versus alternatives like geo-hint or timezone. The intended use case is implied only by the purpose statement; no exclusions or alternative handoffs are mentioned.

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