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: no mention of input types (strings?), output format, rounding, division-by-zero handling, or determinism.

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?

It is very short, but that brevity is under-specification rather than conciseness: the single fragment is redundant with the name and contains a typo-level repetition ('of of'). Nothing is front-loaded because nothing informative is present.

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 two-parameter math tool with no annotations, no output schema, and placeholder parameter descriptions, the definition supplies none of the information an agent needs to call it correctly.

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 coverage is nominally 100%, but the schema's own descriptions are placeholders ('A to process', 'B to process') that convey no meaning. The tool description does not compensate — it never explains that a is the numerator and b the denominator, or that inputs are strings rather than numbers.

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 is 'Ratio Of: Ratio of of.' — a tautology that restates the name and adds a garbled phrase ('Ratio of of'). It never states what the tool computes (e.g., divides a by b) nor distinguishes it from siblings like x402-ratio-simplify, x402-ratio-to-percent, or x402-current-ratio.

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, what inputs represent, or which sibling to prefer for related ratio operations. An agent is left to guess entirely.

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