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

With no annotations, the description must carry the behavioral transparency burden, and it does add useful details: missing inputs fall back to documented defaults, and the year-one total is excluding VAT. However, it does not state whether the tool has side effects, what the output structure is, or how the fee components are combined, leaving some ambiguity.

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 a single compact sentence that front-loads the action and the output categories. It loses a point for the duplicated 'calculator calculator' wording, but otherwise there is no filler.

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 calculator with eight optional parameters and no output schema, the description covers the important aspects: what is computed, that defaults apply, and that VAT is excluded. It leaves the output representation unspecified, but the listed output categories are sufficient for an agent to invoke it and interpret high-level results.

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 every parameter has type, range, default, and a one-line description. The description's default-fallback sentence reinforces schema defaults rather than adding new meaning, so the baseline of 3 is appropriate.

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 verb 'Run' and identifies the resource as the IT support cost calculator, then lists the four computed outputs: monthly support fee, annual support fee, out-of-scope project work, and year-one total excluding VAT. This is clear, though it does not explicitly distinguish itself from sibling tools like calculator_describe or submit_enquiry.

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 provides no guidance on when to choose this tool over calculator_describe, enquiry_describe, or submit_enquiry. The only usage-related note is that missing inputs fall back to defaults, which is behavioral information rather than a selection criterion.

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