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

With no annotations, the description must disclose behavior on its own. 'Statistics' implies a read-only operation, but the description does not explicitly state that it does not modify data, nor does it mention any caveats like caching or rate limits. It adds minimal behavioral context beyond the tool's name.

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, front-loaded sentence that efficiently enumerates the key statistics provided. No wasted words, easy to scan, and every part adds meaning.

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?

The tool is simple (no params, no annotations, no output schema), and the description lists core return values. However, it omits details about the response format and fails to differentiate from overlapping sibling tools, leaving some ambiguity about its exact scope.

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 and the schema vacuously covers 100% of them. The description adds no parameter details because there are none. Baseline for zero parameters is 4, and no deduction is needed.

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 provides marketplace-wide statistics, listing specific metrics like active listings, sellers, sales volume, and top verticals. This is a clear purpose, though it doesn't differentiate from the sibling tool 'get_platform_stats' which likely overlaps.

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?

No usage guidance is provided. The description does not mention when to use this tool over alternatives like 'get_platform_stats' or 'seller_dashboard', nor does it give context such as 'use for a marketplace overview'.

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