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

With no annotations, the description carries the behavioral disclosure burden. It reveals the output format, the page-vs-invoice distinction, and a notable side-effect or payment fact ('Paid $0.01 USDC Base x402'). The payment phrase is somewhat ambiguous, but it is still disclosed.

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 compact and well-structured: first sentence states the output, second clarifies scope, third discloses payment/side-effect. Every sentence earns its place, and the most important purpose is front-loaded.

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 zero-parameter tool with no output schema, the description adequately defines what is returned and the context in which it applies. It could be slightly clearer about how 'X/Y' is determined or whether invoking the tool charges a fee, but it is largely complete.

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?

The tool has zero parameters, so the schema provides full coverage by definition. The description adds useful output semantics without needing to document parameter details, matching the baseline for parameter-free tools.

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 identifies the tool as producing a French multi-page invoice footer with 'Page X/Y' format. It explicitly distinguishes page numbering from invoice numbering (L441-9), so its purpose is unambiguous and not confused with sibling invoice-building tools.

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?

It states the context: sequential pages of one invoice, and warns that L441-9 numbering refers to the invoice number, not the page. This provides clear selection guidance, though it does not explicitly name alternatives or list when-not-to-use cases.

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