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 only mentions the use of Open-Meteo but fails to disclose that most parameters are discarded after validation, that the call is read-only, or any rate-limit/error behavior. The schema descriptions hint at discards, but the description adds no transparency of its own.

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 concise at a single sentence, but it lacks structural elements like front-loading key usage constraints. It is not overlong, but it is under-specified, and the brevity does not compensate for missing critical information.

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 the complexity (9 parameters, none required, no output schema, no annotations), the description is severely incomplete. It does not explain the relationship between the parameters and the output, nor which input to use for a place. An agent cannot reliably invoke this tool correctly based on the description alone.

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 description itself adds no meaning beyond the schema; it does not clarify which parameter corresponds to the 'place' or how the parameters interact. It neither improves nor contradicts the schema, so a baseline score is appropriate.

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 it returns latitude and longitude for a place via Open-Meteo, which indicates a clear verb and resource. However, it does not specify which parameter identifies the place among nine optional fields, making the actual purpose ambiguous. It is not explicitly differentiated from siblings like weather-hint, though the output (coordinates) is distinct.

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 this tool versus alternatives. The description does not mention any context, prerequisites, or exclusions, leaving the agent to guess which input to supply and 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.