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

Beyond the annotations it discloses that nothing is purchased or spent, that no confirmation is required, that API key access is needed, and that insurance/extra services come only from a saved package with one package type per batch. These are exactly the behavioral traits an agent needs that the safety annotations alone do not convey.

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 scope and the 'nothing bought' constraint are front-loaded, and each sentence carries weight (fallback logic, insurance sourcing, auth). The redundant 'Pirate Ship:' prefix and the slightly chatty 'does not ask for your OK' phrasing cost it a point.

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 five optional parameters, no output schema, and no required fields, the description covers the fallback rules, insurance sourcing, single-package-per-batch limit, and the safety/auth profile. It is complete enough to invoke correctly, though it says nothing about what the batch response returns or how to proceed to purchase.

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 already 100%, so the baseline is 3. The description adds real meaning on top: rows lacking weight/size fall back to the supplied package or saved package, and insurance/extra services derive solely from saved_package_id, clarifying how the parameters interact rather than just restating them.

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 clear verb+resource ('create batch') and the two input modes (spreadsheet-style rows or import orders), and 'Nothing is bought yet' distinguishes it from the buy step. It does not name buy_batch explicitly as the sibling to use for purchase, so it falls just short of a 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?

'Nothing is bought yet' and 'does not ask for your OK' imply this is the pre-purchase staging step versus buy_batch, but the alternative is never named and there is no explicit when-to-use/when-not framing. Usage is implied rather than stated.

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