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

No annotations are provided, so the description must carry the full burden. It states the operation is read-only implicitly but does not disclose that only the 'city' parameter is used while others are ignored (though the schema hints at discarding). It does not mention rate limits, API behavior, or whether the result is a simple string or structured data. This is a significant gap for an API call.

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 filler words. It front-loads the primary action. However, it is almost too terse, omitting necessary context, but for conciseness it earns a high score because every word is purposeful.

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?

Given the tool has nine parameters, no output schema, and many siblings, the description is incomplete. It does not explain why so many parameters exist, which one is required, or what the return format looks like. The lack of differentiation from siblings and the absence of behavioral details make it insufficient for an agent to call correctly without inspecting the schema and making 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 each parameter has a description, giving a baseline of 3. The tool description does not add meaning beyond the schema; it only mentions 'city' without elaborating. It does not clarify which of the nine parameters are relevant, which could confuse an agent. The schema descriptions do compensate for some missing guidance, but the description itself adds no extra semantic value.

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 action (get current temperature) with a specific resource (a city) and source (Open-Meteo). It is not a tautology and conveys the primary function. However, it does not differentiate from sibling tools like 'geo-hint' or 'lib-docs-hint' which might have overlapping context, though the weather scope is distinct.

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 versus alternatives. It does not mention exclusions or prerequisites. The description implies usage for temperature queries but does not clarify when to prefer other sibling tools like 'geo-hint' or 'utc-time'. No 'when not to use' is provided.

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