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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint false, so the safety profile is fully covered. The description adds no extra behavioral context, such as data refresh rates, caching, or response format. It is consistent with annotations but does not enrich them, which is acceptable given the annotations' completeness.

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?

A single, focused sentence with no filler. It front-loads the action and object, and every word is essential. The description is optimally concise for its simple 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?

Given the tool's simplicity (no parameters, no output schema), the description is nearly complete. It specifies the location and the type of data (current weather). While it doesn't detail the output format (e.g., temperature units, conditions), this is a minor gap for a tool of this scope, and the description suffices for an agent to invoke it 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?

There are zero parameters, so the schema coverage is trivially 100%. The description does not need to explain any parameters, and it doesn't. Per the baseline for 0-parameter tools, a score of 4 is appropriate since no semantic clarification is required.

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 verb ('Получить' = get) and a specific resource ('текущую погоду' = current weather) with a precise location (Petropavlovsk-Kamchatsky). This unambiguously distinguishes it from all sibling tools, which are travel-related and none deal with weather. Even without explicit differentiation, the specificity makes the purpose unmistakable.

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 description makes the usage context obvious: it is for current weather in that specific city. Since no sibling tool covers weather, there are no alternatives to compare, so explicit when-not-to-use guidance is unnecessary. The description implicitly covers the intended use case and leaves no ambiguity about scope.

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