get_countries

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

No annotations are provided, so the description carries the full burden. It does not explicitly state that the tool is read-only or non-destructive, nor does it mention rate limits, pagination, or response structure. However, the read intent is implicit.

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?

Three concise sentences: one for purpose, one for usage tip, one for filters. No fluff, each sentence adds value.

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?

Despite clear purpose and filters, the description does not mention what the response contains (e.g., a list of countries with counts or percentages). With no output schema, this omission forces the agent to guess the return format.

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 description coverage is 100%, so the baseline is 3. The description's mention of optional filters adds no value beyond the schema, as the schema already describes each filter. No parameter details are enhanced.

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?

Clearly states 'get visitor geography breakdown by country' with a specific verb and resource. The usage tip about comparing periods distinguishes its purpose from sibling analytics tools like get_pages or get_traffic_sources.

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?

Explicitly suggests calling twice with different periods to compare growth, which is a helpful usage guideline. It does not explicitly mention when not to use or compare to siblings, but the context of the tool's purpose is clear.

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