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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is fully covered. The description adds no behavioral context beyond that — no note on caching, freshness, or that the result is a static reference list.

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?

It is a single short sentence, but it is essentially content-free and does not earn its place — it conveys no information beyond the tool name. Brevity here reflects under-specification rather than efficient conciseness.

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 trivial zero-parameter lookup whose return values are covered by an output schema, the description is minimally adequate — an agent can guess what comes back. It stops short of stating the Seznam context and intended downstream use, which is the only real gap.

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, which sets the baseline at 4. Schema coverage is 100% and there is nothing for the description to clarify about 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 ('You will receive the list of languages by calling this API') is a tautology that merely restates the title/name rather than specifying the resource. The agent must rely on the tool name to infer that this returns the Seznam-specific supported language list, and the description does nothing to distinguish it from the many sibling *_languages tools.

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 when-to-use guidance is given. It never explains that this should be called to discover valid language values before invoking a Seznam organic fetch/submit, nor how it relates to get_dataforseo_serp_seznam_locations or the equivalent tools for other engines.

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