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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true, covering the safety profile. The description adds only that the call returns a list and that locations can be filtered by country later, which is minor extra context beyond the structured hints.

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?

Two short sentences with no extraneous text. The first sentence is somewhat redundant (stating that the call returns locations is close to restating the name), but the overall size is appropriate and easy to parse.

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 zero-parameter list endpoint with an output schema, the description is nearly sufficient: it says what is returned and notes later filtering capability. The only missing piece is explicit Seznam-specific identification, though the tool name and title supply that context.

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?

The tool takes zero parameters, so there is no parameter semantics for the description to clarify. Baseline 4 applies; the description's mention of country filtering is about a separate task-setting context, not this call's inputs.

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 resource returned ('list of locations') and the context ('by this API call'), so an agent knows what it fetches. However, it never mentions 'Seznam' or distinguishes this endpoint from the many sibling location tools (baidu, bing, yahoo, youtube), so the description alone does not differentiate it.

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 only usage hint is 'You can filter the list of locations by country when setting a task,' which describes a downstream use rather than when to call this tool versus alternatives. There is no guidance on prerequisites or when to prefer this over the other location endpoints.

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