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

Annotations declare this is a write (readOnlyHint=false), non-destructive, and open-world, so the safety profile is covered. The description adds genuine value beyond that by disclosing that the reported status stays unverified because PayPal is not connected, which is a key side-effect caveat an agent would not otherwise know.

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, front-loaded sentences with no filler. The action comes first and the important caveat second.

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?

There is no output schema and no annotation detail on the return, but the description helpfully explains the unverified status outcome. It still leaves gaps around what orderId identifies and what (if anything) is recorded or returned.

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 0%, so the description must carry the load, but it only obliquely references 'transaction reference' and never mentions the required orderId parameter or any format expectations (e.g., that the reference must be at least 2 characters).

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 ('Report a PayPal transaction reference'), making the action clear. However, it does not differentiate itself from related siblings like order_status or quote_purchase, so an agent must infer the boundary.

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?

The description gives no explicit when-to-use or when-not-to-use guidance and names no alternatives. The reader can only infer that this tool is for attaching a PayPal reference to an order, without knowing how it relates to order_status.

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