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. It says nothing about which units are supported, how the strings are interpreted, or what the response looks like. 'Convert' implies a pure computation, but nothing confirms safety, determinism, or accepted inputs.

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?

A single short, front-loaded sentence with no filler. It is efficient, though its brevity reflects minimal content rather than disciplined editing.

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, no output schema, no unit enumeration, and useless parameter descriptions, the definition leaves an agent unable to determine valid inputs or expected output. For a unit-conversion tool with three string params, this is substantially under-specified.

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 nominally 100%, but the actual descriptions are placeholder junk ('To to process', 'From to process', 'Value to process') that conveys no meaning. The param names to/from/value imply conversion endpoints and a value, but the description adds nothing beyond that, so the baseline 3 for high coverage applies.

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?

States a clear verb+resource: 'Convert between angle units.' An agent immediately knows this is an angle-unit converter. However, it does nothing to distinguish itself from the many angle-conversion siblings (x402-degrees-to-radians, x402-deg-to-rad, x402-rad-to-deg), so 5 is not warranted.

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 generic converter versus the numerous dedicated pairwise converters in the sibling list, no prerequisites, and no conditions or exclusions. Usage is only faintly implied by the tool name and one-line purpose.

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