Get EAN statistics

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

Beyond the readOnlyHint and idempotentHint annotations, the description adds the auth requirement ('Pro API key required') and the cross-retailer scope. It doesn't describe response format or rate limits, but the auth note is a valuable behavioral disclosure.

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 extremely concise, with two short sentences that convey the core purpose and a key prerequisite. No filler or redundancy.

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 empty schema and lack of output schema, the description provides the essential purpose and auth requirement, but it leaves ambiguity about what 'coverage statistics' specifically includes or the return structure. For a simple stats tool, it's marginally adequate but could be clearer.

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 is empty (zero parameters), and schema coverage is 100%. With no parameters to describe, the description isn't required to add parameter details. The description does not reference any parameters, but the baseline for zero parameters is 4.

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 uses the specific verb 'Get' with the resource 'EAN coverage statistics' and scope 'across retailers,' clearly distinguishing it from sibling tools like get_price_history or get_forecast. It conveys precisely what the tool returns.

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 does not explicitly state when to use this tool versus alternatives, but the purpose statement implies usage for EAN coverage statistics. The 'Pro API key required' note is a prerequisite, not a usage guideline. No exclusions or alternative tools are mentioned.

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