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

With no annotations provided, the description must carry the full burden of behavioral disclosure. It mentions a cost per request and an ambiguous 'or pass' condition, but does not clarify whether the operation is read-only, what constitutes a 'pass', or the response format. The description is too shallow for a tool that has side effects (payment) and unclear semantics.

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 that includes the core purpose and a notable cost condition. Every word is informative, with no fluff or repetition, and it is front-loaded with the main purpose.

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 the lack of an output schema and annotations, the description provides only minimal context. It states what is returned (a single event) and the cost, but does not explain the meaning of 'pass', the structure of an event, or any edge cases (e.g., no events available). While the tool is simple, the description leaves gaps that could affect correct usage.

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 there is no parameter-level information to add. The baseline score of 4 applies, and the description does not need to elaborate on parameters since none exist.

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 returning the single most recent agentic-payments event, with a specific scope (most recent) and resource (agentic-payments event). It distinguishes itself from sibling tools like agentpay by the 'latest' qualifier, making its purpose 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 provides no guidance on when to use this tool over alternatives such as agentpay or funding_latest. It does not mention any prerequisites, exclusions, or contextual cues for choosing this tool.

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