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

With no annotations, the description carries the full burden of behavioral disclosure. It only says 'recent payments' without specifying ordering, pagination, default count, or whether it returns both successful and failed payments. No side effects or authentication requirements are mentioned. The read-only nature is implied but not stated.

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 sentence with no waste, but it is under-specified. Conciseness is not the same as brevity; the sentence does not provide enough substance to be considered well-structured for an agent. It lacks front-loaded critical details like default behavior or scope.

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?

Given a single optional parameter, no output schema, and no annotations, the description is far too sparse. It doesn't explain what data is returned (fields, format), how many results are provided by default, or whether results are paginated. For a list operation, this is inadequate for an agent to call it correctly without guessing.

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 only parameter is 'limit' with type number, but schema description coverage is 0% and the description does not mention it at all. The agent has no guidance on what 'limit' does, its default, or its allowed range. The description adds zero value for parameter understanding.

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 the action (list) and the resource (payments) with a scope ('this agent's recent payments'), which is clear enough to distinguish from get_payment (single payment) and list_payment_sources (different resource). However, it doesn't define what 'recent' means or specify any filtering criteria, leaving some ambiguity.

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?

No guidance on when to use this tool versus siblings. It doesn't mention the optional 'limit' parameter or how this differs from get_payment or list_payment_sources. There is no context about intended use cases or exclusions.

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