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

With no annotations provided, the description carries the full burden of behavioral disclosure. It implies a read-only external weather lookup, but it does not mention units, failure modes, rate limits, or the fact that all schema parameters except city 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 sentence with no filler and leads with the main purpose. It is concise, though slightly under-specified in operational detail.

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 no output schema, no annotations, and a 9-parameter schema full of apparently unrelated optional fields, a one-sentence description is inadequate. It does not explain the return payload, units, or how the unrelated parameters should be ignored.

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% and already marks most parameters as discarded, so the baseline is 3. The description does add that 'city' is the operative parameter for temperature, but it does not help an agent understand how to treat the many unrelated optional parameters.

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 that the tool provides current temperature for a city and names the data source (Open-Meteo). This is clear enough to identify the resource, though it lacks an explicit verb like 'gets' or 'returns' and does not explicitly contrast it with sibling hint tools.

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 about when to use this tool versus its many siblings. There are no exclusions, alternative tool references, or contextual hints beyond the fact that it is weather-related, which is insufficient for agent routing.

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