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 states that coordinates come from Open-Meteo; it does not explain network dependency, which fields are used, what happens with missing or invalid input, or what the response structure is. The schema's 'discarded after...' notes add more confusion than clarity.

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 concise sentence with no wasted words, and the key output and data source are front-loaded. It could be improved with a verb and a hint about the relevant parameter, but it is appropriately brief.

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, one sentence is insufficient. The description does not specify which parameter supplies the place, what the returned coordinates look like, or how failures should be handled, leaving an agent poorly equipped to call the tool correctly.

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 input schema already describes every parameter individually. The description adds no parameter-level meaning and, more importantly, fails to connect the tool's stated purpose to any specific parameter such as city or query. Baseline 3 applies because the schema does document parameters, but the disconnect leaves a real gap.

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 states the core output—latitude and longitude for a place—and identifies Open-Meteo as the data source. It is specific enough to distinguish geo-hint from siblings like weather-hint, though it lacks a verb and does not name which input parameter represents the place.

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 instead of sibling tools such as weather-hint or timezone, no prerequisites, and no mention of what inputs are expected. Usage context must be inferred entirely from the tool name and the one-line description.

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