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

No annotations are provided. The description discloses that the service is charged from balance, which is a key behavioral trait. However, it lacks details on destructive effects, rate limits, or responses.

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 front-loading the action and domain. It is efficient but omits important details that would justify slightly more length.

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 lack of output schema, zero param descriptions, and limited context signals, the description fails to provide enough information about prerequisites, response format, or idempotency behavior, making it incomplete for the agent.

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?

With 0% schema coverage and no parameter descriptions in the tool definition, the description adds no meaning beyond the schema. Parameters like agent_id and idempotency_key are unexplained.

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 tool registers a .ru/.рф domain and mentions it is a secondary service charged from balance. It implies the specific TLDs and financial aspect, but does not explicitly differentiate from sibling tools like check_domain or fetch_ru.

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 mentions it's a secondary service, but gives no explicit guidance on when to use this tool versus siblings (e.g., check_domain for checking availability) or prerequisites like having sufficient balance.

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