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

With no annotations, the description carries the full burden, and it does disclose one meaningful behavioral effect — that the call reconciles the payment and raises a trust score (a side effect worth knowing). It omits idempotency, whether duplicate filings are rejected, error behavior, and auth requirements for a mutation-style operation.

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?

A single tight sentence with the precondition ('After paying') front-loaded ahead of the action and its benefit. No filler, though it is arguably under-sized for the tool's schema complexity.

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?

No output schema, no annotations, 0% parameter coverage, and a nested receipt object make the description insufficient: an agent cannot know what shape the receipt must take or what fields are mandatory within it. The stated trust-score benefit is the only extra context provided.

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% for two required parameters, one of which is a nested object with six sub-fields (url, note, total, currency, merchant, reference). The description names only the concept 'receipt or invoice' and says nothing about payment_id or any field format, so it fails to compensate for the total lack of schema documentation.

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 states a specific verb+resource (file the receipt/invoice) and situates it in a workflow step ('after paying'), which distinguishes it from sibling tools like request_payment. It does not name any sibling explicitly, but the action itself is 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?

There is an implied precondition ('after paying'), which gives the agent timing guidance, and a stated purpose (reconciliation). However, no alternatives are named (e.g., what to do instead if no receipt is available), and no prerequisites such as required permissions or whether it can be re-filed are given.

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