get_country_codes

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

With no annotations provided, the description must fully disclose behavioral traits. While 'get' implies a read-only operation, the description does not explicitly state it, nor does it mention response format, error handling, or any side effects. This is a minimal disclosure, leaving the agent to infer the tool's safety and behavior.

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 that is front-loaded with the action and resource. Every word contributes to meaning, and there is no fluff or repetition.

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 tool's simplicity (zero parameters, no output schema), the description is minimally adequate. However, it does not specify what exactly is returned (e.g., ISO codes, country names) or how the list might be used. The phrase 'for Sensor Tower API' provides some context, but the description could be more complete for an agent expected to consume the result.

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 has zero parameters, so the input schema carries no burden. The baseline for zero parameters is 4, and the description is sufficient since there are no parameter semantics to clarify.

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's function: 'Get list of available country codes for Sensor Tower API.' The verb 'get' and the specific resource 'country codes' make the purpose unambiguous, and it is distinct from the sibling analytics tools, which perform data retrieval rather than utility lookups.

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 provides no guidance on when to use this tool, nor does it mention alternatives or exclusions. For a utility like this, it would be helpful to note that it's useful for validating country codes in other API calls, but no such context is given.

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