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

No annotations are present, so the description carries the full behavioral burden. It discloses the external source (Open-Meteo) and implies a read-only lookup, but it does not describe failure behavior, rate limits, or the fact that only the city parameter is used while the other eight are 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, front-loaded sentence with no wasted words. It is clear and concise, though slightly too terse given the 9-parameter schema and the need to explain which input is the relevant one.

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?

The tool has no output schema, no annotations, and a 9-parameter schema with no required fields. The description only covers the city-temperature case and does not tell the agent what happens with the other parameters, what the response format is, or what a no-argument call does.

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 description coverage is 100%, so the baseline is 3. The tool description adds no parameter-level meaning, but the schema itself documents each parameter and notes which are discarded, which is sufficient for the baseline.

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's function: returning current temperature for a city, with the data source Open-Meteo. It is specific about the resource, though it lacks a verb and does not differentiate from sibling 'hint' tools such as geo-hint.

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, nor which of the 9 optional parameters to provide. The description only says what the tool does, not how to invoke it correctly or when it is preferred.

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