paypal_invoices

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

With no annotations, the description carries the full burden. It fails to disclose side effects, rate limits, or authentication requirements beyond the schema. No details on what sending or creating an invoice entails.

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 very short (two sentences). While concise, it sacrifices essential detail. It earns a baseline 3 for being minimally acceptable but not good.

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?

The tool has multiple actions and 8 parameters, but the description does not cover return values, error states, or behavioral nuances. No output schema exists, so the description should explain what each action returns, which it does not.

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 only 38%. The description adds no parameter explanations beyond what the schema already provides. For example, it does not clarify the 'invoice' object structure or how 'page' and 'page_size' affect listing.

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?

The description mentions three actions (list, create, send) but lacks specificity on what each entails. It does not distinguish from sibling tool 'paypal_orders', which likely overlaps. The purpose is vague.

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 over alternatives. Prerequisites, such as required authentication and when to use each action, are missing. The description simply states the actions without context.

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