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

With no annotations, the description carries the full burden of behavioral disclosure, but it only mentions default fallback. It does not state whether the operation is read-only, what outputs are produced, or any side effects, and the duplicated phrase adds confusion.

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?

The description is short but poorly structured: 'calculator calculator' is redundant and 'Published regulator fees, year one' appears twice. It reads like a malformed concatenation rather than a clean, front-loaded explanation.

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 three parameters, no annotations, and no output schema, the description is incomplete. It does not explain what the calculator returns, how the listed regulator fees and MiCA minimum capital relate to the result, or which specific defaults apply to missing inputs.

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%, so the baseline is 3. The description adds no parameter-specific meaning beyond the generic 'Missing inputs fall back to their documented defaults', which does not enhance the schema's already-provided parameter descriptions.

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 says 'Run the Crypto licence cost calculator calculator', which names a verb and resource, but the redundant 'calculator calculator' and the repeated 'Published regulator fees, year one' fragment muddy the meaning. It does not differentiate from sibling tools like calculator_describe.

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 alternatives. The only usage-related note, 'Missing inputs fall back to their documented defaults', concerns input behavior rather than selecting this tool over a sibling.

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