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 add genuinely useful cost context ('Flat 5 points per successful run'), but it never states that this is a read-only operation nor describes the shape or size of the returned tree. Cost disclosure is valuable; the safety/return profile is missing.

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?

Two short sentences with no waste; the resource and its scope are front-loaded ahead of the cost note. Nothing is padded.

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?

For a trivial no-parameter, no-output-schema tool, the description covers what it returns at a high level and discloses the credit cost. Only the return structure (depth, IDs, localization) is left unstated, which is a minor gap.

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 takes zero parameters, and the schema is an empty object, so there is nothing for the description to disambiguate. Baseline 4 applies for a no-param tool.

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?

States a specific verb (Get) and resource (eBay browse category tree) with explicit scope: every department, category, and subcategory. This is clearly distinguishable from siblings like run_ebay_item_search or run_ebay_product, which operate on items rather than the taxonomy.

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 when-to-use or when-not-to-use guidance is given, nor any mention of alternatives or prerequisites. An agent must infer that this is the taxonomy lookup used to resolve category IDs before calling search/item tools.

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