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

With no annotations, the description must carry the full burden of behavioral disclosure, but it only names an external data source. It does not say whether this is a read/network call, which parameters are actually consumed, whether inputs are discarded, or what errors or limits apply; the schema's 'discarded' notes hint at behavior but conflict with the stated purpose.

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?

One compact sentence with no filler; the Open-Meteo attribution adds useful context without bloat. It is as terse as possible while still conveying the core purpose.

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?

For a tool with no required parameters, nine optional inputs, no output schema, and no annotations, a single-purpose sentence is not enough to invoke it correctly. The agent cannot determine the expected input, output shape, or failure behavior, and the schema hints are contradictory.

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?

The description does not map 'a place' to any of the nine optional parameters, and the schema's city field says it is for a weather hint and 'discarded after the call', which conflicts with using it for geocoding. High schema coverage earns a baseline, but the confusion around which field is the place input seriously undermines parameter semantics.

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 the tool resolves a place to latitude and longitude via Open-Meteo, which is a concrete geocoding purpose and distinguishes it from weather or timezone siblings. It stops short of naming the input parameter or using an explicit verb like 'looks up', but the resource and result are reasonably clear.

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 on when to use geo-hint rather than a sibling like weather-hint, timezone, or fetch-status, and no conditions or alternatives are mentioned. The only usage clue is the phrase 'for a place', which is not operational enough for an agent to know when to choose this tool.

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