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

No annotations are present, so the description alone must disclose behavior. It reveals the external data source but says nothing about input handling, required fields, output format, errors, or side effects. The schema's repeated 'discarded after...' notes suggest a broader shape-check behavior that the description never acknowledges.

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 focused sentence with no filler and the core purpose is front-loaded. However, given the nine-parameter schema and lack of annotations, this brevity comes at the expense of necessary context.

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?

The tool has nine optional parameters, no output schema, no annotations, and no usage guidance. The one-line description does not explain why most parameters exist, what the tool returns, or how to invoke it reliably beyond passing a city, so an agent would likely make incorrect assumptions.

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 little beyond identifying city as the relevant input; the schema already documents city's role. It does not help clarify why the other eight parameters exist or whether they affect the weather lookup.

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 names a specific operation (current temperature), a specific resource (city), and a specific provider (Open-Meteo), so an agent can select it for weather lookups. However, it does not address the nine unrelated-looking optional schema fields or differentiate it from sibling tools like geo-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?

No guidance is provided on when to use this tool versus alternatives, nor on which of the many optional parameters should be supplied. There are no exclusions, prerequisites, or explicit selection criteria, leaving invocation to inference.

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