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

With no annotations, the description must disclose behavioral traits on its own, but it only states that coordinates are provided via Open-Meteo. It does not mention that the tool likely makes an external API call, which parameter is required, what happens with multiple parameters, or what the return format is.

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 phrase with no filler and front-loads the core capability. However, it is so terse that it leaves out essential usage and parameter context for a tool with a large input schema.

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 is a 9-parameter tool with no required parameters, no annotations, and no output schema, yet the description only provides a one-line capability statement. It does not explain which parameter to supply, what the response looks like, or how the tool behaves when multiple parameters are provided.

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 adds the provider and output type but does not clarify that 'city' is the intended place parameter among the nine optional fields, nor does it resolve confusion from the schema's unrelated 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 identifies the tool's output as latitude and longitude for a place, using Open-Meteo, which is a clear and specific capability. It broadly distinguishes this from sibling tools like weather-hint and timezone, though it does not explicitly name the expected input (e.g., city).

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 alternatives like weather-hint or timezone. The purpose implies use for geocoding, but there is no explicit when-to-use, when-not-to-use, or alternative routing.

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