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

With no annotations, the description carries the full behavioral burden. It discloses the integer range (1–3999) and bidirectional operation, which is useful, but omits error handling, case sensitivity of Roman input, output type, and how to signal which direction is intended.

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 front-loaded sentence with no filler. Every word contributes to stating the operation and its bounds.

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?

Given a required nested payload, zero schema descriptions, no annotations, and no output schema, the one-sentence description is insufficient. It does not tell the agent how to supply either 'roman' or 'value', how nulls are handled, or what the return format is.

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 partly maps to the 'value' and 'roman' fields by mentioning integer and Roman numeral, and gives the range for integer, but does not name the required nested 'payload' object, explain mutual exclusivity, or document null defaults.

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 specific verb (convert) and resource (integer / Roman numeral), with a clear bidirectional scope and the valid integer range. This distinguishes it from siblings like number_ordinal, number_words, and number_radix without needing to open any schema.

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 (Roman numeral conversion) but offers no explicit when-to-use guidance, no alternatives, and no exclusions. It is adequate for the obvious case but leaves the agent to infer that this is not the tool for ordinal, written-out, or radix conversions.

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