send_sms

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

With no annotations, the description must fully disclose behavioral traits. It simply states the action without details on execution (synchronous/asynchronous), failure modes, or side effects (e.g., costs). This is insufficient for an agent to understand the tool's behavior beyond the bare function.

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, efficient sentence. It is front-loaded and conveys the core purpose without wasted words. However, it is arguably too minimal for a tool interacting with an external service.

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 simplicity (3 params, no output schema), the description is partially adequate but fails to mention the return value or result. For completeness, it should hint at success/failure or confirmation. Without that, an agent lacks information on what to expect.

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?

Schema coverage is 100%, so the schema documents each parameter. The description adds no additional meaning beyond the schema. Baseline is 3, and since no extra value is provided, the score remains 3.

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 'Отправить SMS через Voximplant' (Send SMS via Voximplant) clearly states the action (send SMS) and the system (Voximplant). It is specific and distinguishes from sibling tools like get_sms_history, which is for viewing history, not sending.

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 usage guidelines are provided. The description does not indicate when to use this tool versus alternatives, nor does it mention any prerequisites, limitations, or when not to use it. This leaves the agent without context for appropriate invocation.

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