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: not whether the result is a percentage or absolute value, not whether the series is interpreted as prices or returns, not the windowing convention. For a calculation tool with zero annotation coverage this is a serious gap.

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?

It is short, but the second clause repeats the first, so the brevity comes from under-specification rather than efficiency. No part of the sentence front-loads the information an agent actually needs.

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 and no output schema, the description must explain input format and return semantics, and it does neither. An agent cannot tell what input shape is expected or what the result represents.

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 technically 100%, which sets the baseline at 3, but the schema's own text ('Values to process') is a placeholder that conveys no format, so the description adds no compensating meaning. The description offers zero parameter guidance, leaving ambiguity about comma-separated values vs. JSON array.

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 'Max Drawdown: Maximum of drawdown' is effectively a tautology that restates the tool name without specifying the resource, method, or output. It hints at a financial risk metric but gives no verb-and-resource specificity, and it collapses into its near-identical sibling x402-drawdown.

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?

Nothing states when to use this versus the many other finance/statistics siblings, most notably x402-drawdown, x402-returns, or x402-roi. There are no prerequisites, no exclusions, and no routing hints of any kind.

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