billing_get_invoice

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

No annotations are provided, so the description carries the burden. 'Get details' suggests a read-only operation, which is clear, but it does not disclose any additional behavioral aspects such as required permissions, error conditions, or return format. For a simple get, this is adequate but not rich.

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 a single, concise sentence (7 words) that starts with the action and clearly states the scope. There is zero waste, and it is appropriately brief for a simple get operation.

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 get with no output schema, the description is minimally sufficient but lacks specifics about what 'details' include or any prerequisite steps. Given the low complexity, it is adequate but leaves room for more contextual guidance.

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%, and the description does not explain the invoice_id parameter beyond what the schema already provides. It also does not mention how to obtain an invoice_id (e.g., via billing_list_invoices), leaving the parameter semantics underspecified.

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 clearly states the action ('Get details') and the target resource ('a single invoice'), distinguishing it from sibling billing tools like billing_list_invoices, which handles multiple invoices. It is specific and unambiguous.

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 implies usage when needing a single invoice's details, but it does not explicitly state when to use this instead of billing_list_invoices or provide alternative guidance. The usage context is implied by the singular 'single invoice'.

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