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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing. It does not state whether this is a read-only computation, what the output shape is, or how the input string should be formatted.

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 text is trivially short but not concisely informative; it wastes its space by duplicating the name. Brevity here reflects under-specification rather than efficiency.

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?

With no annotations, no output schema, and a merely one-parameter schema, the description is entirely inadequate. An agent cannot determine what the tool does or how to call it correctly from this definition.

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 coverage is 100%, but the single parameter 'values' is documented only as 'Values to process', which is vague for a running-total operation. The description adds no information about expected input format (delimited numbers, array, etc.).

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 is "Running Total: Running Total", which merely restates the tool name and title with no verb or resource explanation. It does not tell the agent what the tool actually computes or returns. Among hundreds of siblings, this provides no distinguishing information.

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 whatsoever on when to use this tool versus alternatives. There are many similar cumulative tools (x402-cumulative-sum, x402-cumulative-product, x402-cumprod-array, x402-moving-sum) and the description offers no differentiation.

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