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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and a closed-world scope, so the safety profile is fully covered. The description's added content (return shape, 1-3999 range) duplicates the schema and output schema rather than disclosing anything new, and 'between' implies bidirectionality not supported by the single integer input.

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?

Two tight sentences with the core purpose front-loaded and no filler. The trailing list_bundles cross-reference is marginally useful but is the least essential part of the text.

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?

An output schema exists, so the explicit return shape is redundant but harmless, and annotations carry the safety profile. For a single-parameter, closed-world calculator the definition is essentially complete; only the when-to-use guidance is missing.

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 100% and there is only one parameter, whose meaning and 1-3999 bounds are fully stated in the schema, so the baseline of 3 applies. The description adds no format or syntax detail, and its 'between Roman numerals and decimal' phrasing could mislead an agent into passing a Roman string that the integer-typed schema would reject.

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 and resource ('Convert between Roman numerals and decimal') that is unambiguous among the many calculate_* siblings. The '(1-3999)' scope qualifier sharpens it, but no sibling is named as a near-alternative, so it stops short of the 5-level differentiation.

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 versus other conversion-style calculators, no prerequisites, and no exclusions. The only routing hint is 'See list_bundles for related conversions calculators,' which points at a discovery tool rather than telling the agent when this tool is the right choice.

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