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 only states the tool's purpose but reveals no behavioral traits: no mention of read-only nature, no side effects, no authentication requirements, no rate limits, or what the output looks like. The description adds no value beyond the bare statement.

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 (one short sentence), but this is under-specification rather than effective conciseness. It fails to convey critical usage context. While it is front-loaded with the core purpose, it omits necessary behavioral and usage details, so it does not earn its place as sufficient.

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?

With no parameters, no output schema, and low complexity, the description should at least indicate what the catalog contains and how to interpret it. It only states what 'standing SKUs' are, but does not mention return format, pagination, or any interaction details. This is inadequate for an agent to confidently invoke the tool and process 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, and the schema has additionalProperties: true. Per the baseline rule for 0 params, a score of 4 is appropriate because there are no parameters to document. The description doesn't add parameter information, but none is needed. The schema's allowance for additional properties is not addressed but is not a required disclosure.

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 states a specific resource (standing SKUs) and an implied action (listing/cataloging for purchase via x402). It distinguishes from siblings like sku_get/sku_search by focusing on the catalog nature rather than retrieval of a single SKU. However, it lacks an explicit verb like 'list' or 'retrieve', so it's not a perfect 5.

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 guidance is provided on when to use this tool versus alternatives such as sku_search or sku_get. There is no mention of context, exclusions, or preferred scenarios. The description is purely informational with no directional advice.

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