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

No annotations are provided, so the description carries the burden. It does add one genuinely useful operational fact — 'Flat 5 points per successful run' — which tells the agent about cost/pricing. It says nothing about failure modes, missing sellers, or rate limits, so it is only partially transparent.

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, front-loaded with purpose followed by cost. Nothing is padded, though the second sentence is a pricing note rather than definitional content.

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 single-parameter lookup with no annotations and no output schema, the description covers what is fetched at a high level, but omits what the response looks like and how it handles invalid or nonexistent sellers. Adequate but with clear gaps.

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?

Schema coverage is 100% and the single 'seller' parameter is fully documented in the schema ('Username or store URL. e.g. cocosmartphones'). The description adds no syntax or format detail beyond that, so the baseline 3 applies.

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 and resource ('Get an eBay seller/store profile by username') and enumerates the returned content (feedback, ratings, store details). It does not, however, distinguish itself from close siblings like run_ebay_seller_feedback or run_ebay_seller_items, whose subject matter overlaps with the 'feedback, ratings' phrasing.

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 guidance or alternatives are given. An agent choosing among run_ebay_seller, run_ebay_seller_feedback, and run_ebay_seller_items gets no help deciding which to call for which need.

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