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

The annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false. The description adds the dependency on Google Search Console connection and directs users to an integration page, which is valuable behavioral context beyond the annotations.

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 three sentences, each serving a specific purpose: stating the function, indicating use case, and providing an integration directive. It is concise and front-loaded with the primary action.

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 comprehensive schema annotations and no output schema, the description adequately conveys the tool's purpose and prerequisite. It could specify return metrics, but the country-breakdown concept is clear from the name and description.

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 input schema descriptions cover 100% of parameters (site, startDate, endDate, rowLimit), so the description does not need to add parameter-level details. The tool description does not provide additional semantics beyond what's in the schema.

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 search traffic broken down by country,' which specifies both the action and the resource. This distinguishes it from sibling tools like get_gsc_device_breakdown and get_gsc_date_trends by focusing on country segmentation.

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 use-case context ('useful for understanding geographic audience and international SEO performance') and identifies a prerequisite ('Requires Google Search Console to be connected') with a direct action for the user. It does not explicitly mention alternatives but the context is clear.

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