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 about return format, units, or behavior for non-numeric/negative input. For a pure computation tool the risk is low, but the description still fails to describe what the agent gets back.

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 two clauses say the same thing twice with zero added information. This is under-specification masquerading as brevity rather than efficient, front-loaded structear.

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 single-parameter math tool with no output schema, the description should at minimum state the formula or return semantics. It leaves units, output format, and the meaning of the 'side' string parameter entirely undocumented.

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 100%, so the baseline is 3. However, the only schema text is the vague 'Side to process', and the description adds no clarification about units, valid ranges, or numeric format for the side length.

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 restates the name and title almost verbatim ('Cube Volume: Volume of a cube'), which is tautological rather than informative. It gives no verb like 'compute' and does not differentiate from siblings such as x402-cube-surface, x402-cube-diagonal, or x402-box-volume beyond the word 'volume'.

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?

There is no indication of when to use this tool versus alternatives like x402-box-volume or x402-rect-prism-volume, nor any mention of prerequisites. The agent is left to infer usage entirely from the name.

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