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

With no annotations, the description must carry behavioral weight; it does disclose the core behavior and an external dependency on Open-Meteo. But it omits the response shape, side effects, and the fact that many schema fields appear irrelevant or discarded, so transparency is only partial.

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 the key output is front-loaded. It is concise, though too terse to compensate for the ambiguous multi-parameter 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?

For a tool with 9 optional parameters, no annotations, and no output schema, the description is incomplete: it doesn't say which parameter to provide, what the returned data looks like, or whether the other schema fields are ignored. An agent cannot reliably invoke this tool correctly from the definition 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 coverage is 100%, so the baseline is 3. The description adds no parameter guidance, and the 9 optional fields are mostly unrelated to geocoding, leaving the agent to guess that 'city' is the relevant input.

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 a clear purpose: returning latitude and longitude for a place via Open-Meteo. It is not a tautology and distinguishes the tool from many shape/URL-checking siblings, though it doesn't explicitly contrast it with weather-hint.

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 intended use is implied: when an agent needs coordinates for a place, this tool provides them. However, there is no explicit guidance about when not to use it, which parameter identifies the place, or how it relates to similar lookup siblings.

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