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

No annotations are provided, so the description carries the full burden. It discloses the payment model ('5 free trial calls per signed wallet') and the computation itself, which is genuinely useful, but says nothing about the return format, error handling, precision, or whether inputs are validated. For a tool with zero annotation coverage this is a notable gap.

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?

Front-loaded and compact: the name, definition, and formula come first in a single sentence. The free-trial emoji prompt is promotional padding but small, and the formula itself earns its place by removing ambiguity.

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 simple deterministic two-input calculator with no output schema or annotations, the formula is the essential missing piece and it is supplied. What remains absent is parameter format guidance (string numerics) and any indication of the response shape, which leaves the agent under-informed for invoking 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 description coverage is 0%, so the description must compensate. It does map both parameters to their mathematical roles (revenue as numerator, averageReceivables as denominator), which adds real meaning. However, both are typed as strings with no format guidance in either the schema or the description, so the agent cannot tell what input syntax is expected.

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 names a specific financial ratio and spells out the exact formula (revenue / average receivables), which distinguishes it from siblings like asset-turnover or inventory-turnover that use different numerators and denominators. It stops short of explicitly naming those siblings as alternatives, but the formula makes the scope unambiguous.

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 other turnover or efficiency ratios, nor any stated prerequisites (e.g., that revenue and receivables must cover the same period). The agent must infer usage entirely from the name and formula.

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