Create Geometry Sphere

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

The annotations indicate a non-read-only, non-idempotent mutation, which the description aligns with. It adds the fact that the sphere is 'centered' and uses 'SI length units', providing useful context beyond the raw annotations. However, it does not disclose potential side effects, naming constraints, or coordinate system assumptions.

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 front-loads the core purpose. Every word contributes meaning, with no redundant filler or repetition of schema information.

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?

The tool is simple and an output schema is present, so return value explanation is unnecessary. However, the description lacks broader workflow context, such as prerequisites (e.g., an active geometry session) or how this creation step relates to subsequent geometry operations. Minimal but acceptable for a basic creation tool.

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?

With 0% schema description coverage, the description must compensate. It clarifies that all length-related parameters (radius, center coordinates) use SI units, which is valuable. However, it does not explain the individual parameter semantics beyond what their names imply, and it omits details about defaults or constraints already present in the schema.

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 'Create a centered sphere using SI length units' clearly states the action (create) and the resource (sphere). It distinguishes itself from sibling tools like geometry_create_block and geometry_create_cylinder by explicitly naming the shape.

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 implies usage when a sphere geometry is needed, but it does not explicitly state when to use this tool over alternatives like geometry_create_cylinder or geometry_create_block. There are no exclusions or alternative references.

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