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

Annotations already declare readOnly/openWorld/non-destructive, so the safety profile is covered; the description adds meaningful context beyond that: the permission requirement and the response shape ('results plus next_offset'), which signals pagination. It does not detail rate limits or error behavior, but that's a minor gap given annotation coverage.

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 compact sentences plus the endpoint, with the core purpose and time-window scoping front-loaded before the optional filters, permission note, and reply shape. No sentence is wasted.

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 read-only list tool with no output schema, the description covers the essentials: what is listed, the required period, optional filters, the permission prerequisite, and the reply shape with pagination. Nothing an agent needs to call it correctly is missing.

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%, so start/end, limit, offset, winery_id, winery_name and business_unit are already documented. The description only restates that winery/business unit are optional filters and does not add format or semantics beyond the schema, so 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 (list) and a well-scoped resource ('bulk wine cost movements between batches and wineries'), which is distinct from generic siblings like search_transactions or list_inventory. It does not explicitly name an alternative tool, so it stops short of full sibling differentiation.

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?

Gives clear usage context: a required time window, optional narrowing to one winery or business unit, and the prerequisite of the vintrace cost-viewing permission. It does not state when NOT to use it or name alternative tools, so it lacks exclusions.

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