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

With no annotations, the description carries full responsibility for explaining behavior. It merely says 'Volume of sphere cap' and provides no detail about how inputs are supplied, what assumptions are made, or what the output looks like.

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 very short and front-loaded, which is efficient. However, what exists is minimal and does not add meaningful information beyond the tool name, making it under-specified rather than appropriately concise.

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 massive sibling list of geometry/math tools, this description omits essential context about inputs and output format. An agent cannot confidently select or invoke this tool without additional information that is not captured anywhere else.

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 schema has zero parameters, so there are no parameter fields for the description to clarify. Baseline 4 is appropriate because the description does not need to compensate for a schema gap.

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 a specific operation (compute volume) and resource (sphere cap), but it essentially restates the tool name with no extra detail. It does not distinguish this from sibling sphere/volume calculators or identify what defines a sphere cap.

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 is provided on when to use this tool versus alternatives. There is no mention of required inputs, such as radius and cap height, or when this tool is preferred over sphere-volume, hemisphere-volume, or other geometric volume tools.

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