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

The description adds meaningful context beyond the readOnlyHint annotation by disclosing the authorization requirement ('needs a key with the Payments area') and the underlying Admin API endpoint. It does not describe return shape or pagination, but the auth prerequisite is a useful behavioral detail.

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?

Front-loads the purpose and follows with the permission and endpoint details. It is compact with little waste, though the endpoint reference is somewhat secondary for an agent that does not call HTTP directly.

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 single-parameter read tool with full schema coverage and a readOnlyHint annotation, the description supplies the key missing context: the Payments-area permission requirement. No output schema exists, but the return type is sufficiently implied and an agent can invoke it correctly.

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%, and the sole parameter is already documented as the order uuid. The description reinforces that the parameter identifies one order but adds no syntax or format details beyond the schema, so baseline 3 is appropriate.

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: listing payment transactions for one order. It is clear what the tool returns, though it does not explicitly distinguish itself from nearby siblings like get_order or get_order_invoices.

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 implied use case is clear from 'payment transactions of one order', but there are no explicit when-to-use or when-not-to-use instructions, and no sibling alternative is named.

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