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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered structurally. The description contributes non-obvious behavioral context in the form of usage-based billing with a $0.012 default request estimate, but says nothing about response shape, caching, or whether the language list is static.

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 short, but its first sentence is filler that merely restates the title, and the pricing comment block is boilerplate injected across tools. Little of the text is load-bearing, though it is at least front-loaded and not bloated.

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 read tool with an output schema (so return values need not be described), the essentials are technically present, and pricing is disclosed. However, an agent still cannot tell from the description why it should pick this Seznam language list over the sibling engine language lists, nor what the returned language codes are used for.

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 nothing for the description to disambiguate. Baseline is 4 for a parameterless tool; no additional parameter meaning is needed or missing.

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 sentence 'You will receive the list of languages by calling this API' essentially restates the title 'List of Seznam Languages for SERP' without adding a real verb/resource statement or any scope details. Nothing distinguishes it from the many sibling language tools (baidu_languages, bing_languages, yahoo_languages, youtube_languages) beyond the tool name itself.

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 call this tool, what prerequisites exist, or how it relates to siblings such as get_dataforseo_serp_seznam_locations or the seznam_organic_fetch tools. The only added text is a billing disclaimer, which is not usage guidance.

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