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

No annotations are provided, so the description carries the full disclosure burden. It merely says 'convert between angle units' and does not explain how input is supplied despite an empty schema, what conversions are supported, or what the response looks like. Effectively no behavioral information beyond the tool name is given.

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, but the opening 'Angle Unit:' simply restates the tool name and carries no additional information. The useful content is the single clause 'convert between angle units,' which is concise but repetitive.

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 tool with zero parameters and no output schema, an agent needs at least an explaination of how to invoke the conversion, such as whether input is provided via natural language or hidden defaults. The current description does not clarify supported units, call format, or return shape, leaving the agent unable to use the tool reliably.

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 zero parameters, the schema has nothing to document, so the baseline is 4. The description adds no parameter information, but there are no parameters to describe.

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 clear action ('convert') and a resource ('angle units'), so an agent understands the basic function. However, it does not differentiate this tool from several siblings that also convert angles, like x402-degrees-to-radians, x402-radians-to-degrees, or x402-units-convert.

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 guidance on when to use this tool versus the many related conversion tools. The description gives no context about preferred inputs, when to choose it instead of a sibling, or any exclusions.

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