get_number_by_country_id

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

No annotations are provided, so the description is the sole source of behavioral disclosure. It adds 'currently available', implying a dynamic read operation, but does not explicitly state read-only behavior, pagination, error handling, or other side effects. This is adequate for a simple list tool but leaves gaps.

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 that front-loads the action and resource. There is no redundant wording or unnecessary elaboration, earning full marks for 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?

Given the presence of an output schema and only one required parameter, the description is reasonably complete. It could be improved by clarifying what 'numbers' refers to (e.g., phone numbers), but the sibling tools and tool name provide enough context to disambiguate.

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 schema provides 100% coverage with the countryId parameter and an example value. The description mentions 'by given country id', which mirrors the parameter name and adds minimal semantic value beyond what the schema already conveys. It does not introduce new constraints or formatting details.

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 action (Get), the resource (numbers list), and the condition (by given country id). This distinguishes it from sibling tools like view_sms_history and get_all_countries by targeting a specific country-based number lookup.

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 clearly implies the usage context: use when you need a list of currently available numbers for a specific country. It does not explicitly mention alternatives or exclusions, but the context is unambiguous enough for an agent to decide when to invoke it.

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