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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds that results feed into `calculate_tax`, which is genuinely useful workflow context, but says nothing about ordering, stability, or caching behavior beyond what the output schema already conveys.

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 short sentences, front-loaded with the primary action and scope. The second sentence partially restates the first ('returns a list of calculators') while adding the `calculate_tax` link, so it earns most but not all of its space.

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?

With an output schema present, the description need not describe return values, and zero parameters remove input burden, so it is largely complete. The only mild gap is that it does not say whether the list is exhaustive or how it relates to the other calculator-adjacent siblings.

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?

The tool takes zero parameters, so per the rubric the baseline is 4. The description does not need to explain any inputs and correctly avoids doing so.

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 gives a specific verb+resource (list all available Irish tax calculators) and states what is returned (names and descriptions). It links to the sibling `calculate_tax` tool, clarifying its place in the workflow, though it does not differentiate itself from other list-style siblings such as `list_tax_treaty_countries`.

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 phrase 'that can be used with the `calculate_tax` tool' implies this is a discovery step preceding calculation, which is useful implied usage. However, there is no explicit when-to-use guidance, no statement of when a caller should prefer `get_calculator_schema` or `get_calculator_stats` instead, and no exclusions.

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