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

No annotations are provided, so the description carries the full behavioral burden. 'Via Open-Meteo' implies an external network dependency, but it does not disclose read-only status, failure behavior for unknown places, rate limits, or any side effects. The schema's 'discarded after' notes hint at no-op behavior, but the main description does not add behavioral transparency.

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 language, making it concise and easy to scan. However, it is under-specified for the complexity of the schema, so while it earns a good conciseness score, it is not a fully complete definition.

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 no output schema, no annotations, no required parameters, and 9 optional properties that are not tied to the main description, the definition is not contextually complete. The agent cannot tell which parameter to pass, what errors to expect, or how the 'discarded after' behavior affects the result.

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 even without parameter information in the description. The description itself adds no parameter-level guidance, and the candidate parameter 'city' is described only as a 'weather hint' rather than as the place to geocode, which leaves some ambiguity.

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 signals the tool's output: latitude and longitude for a place via Open-Meteo. It does not use an explicit verb, and it does not mention how the place is identified or how it differs from related siblings like weather-hint or timezone, but the core purpose is recognizably a coordinate lookup.

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 description gives no guidance on when to use this tool instead of a sibling, and the schema's 9 optional parameters are not tied to any selection condition. There is no 'use this when...' or 'if not... use X' information, so the agent is left to infer when this tool is appropriate.

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