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

With no annotations, the description carries the full behavioral burden. It does disclose a cost model ('1 point per returned record') and lists the returned fields, which is useful. However, it omits read-only/idempotency guarantees, authentication requirements, rate limits, and pagination behavior, leaving significant behavioral gaps for a tool without annotations.

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 with zero waste. It efficiently combines the action, resource, identifier, return fields, and cost note.

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 simple retrieval tool with full schema coverage and no output schema, the description provides the essential return fields and cost model. It is largely complete, though it could mention that pagination is available or clarify read-only behavior given the absence of annotations.

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 description coverage is 100%, so the schema fully documents each parameter (product, max_items, start_page). The description only mentions ePID as the identifier and adds no additional meaning beyond the schema's own descriptions. Baseline 3 is appropriate when the schema does the heavy lifting.

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 ('buyer reviews for an eBay catalog product by ePID'), and enumerates the returned fields (rating, text, author). It distinguishes this from a general eBay product lookup by focusing on reviews, but does not explicitly name sibling tools like run_ebay_product to contrast.

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 on when to use this tool versus alternatives, such as run_ebay_product or run_ebay_seller_feedback. The description only says what it fetches, leaving the agent to infer that this is the tool for product reviews specifically.

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