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

The annotations already declare readOnlyHint, idempotentHint, non-destructive and a closed-world scope, so the safety profile is fully covered. The description adds no behavioral context beyond restating the inputs (no return format, no note that it is a pure deterministic calculation), so it contributes little beyond structured data.

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 first sentence is tight and front-loaded, but the second is a link to a separate 'full version' that is irrelevant to invoking the tool and dilutes the definition. One sentence earns its place, one does not.

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 simple three-parameter deterministic calculator with full annotations and full schema coverage, the description names both the outputs and the required inputs, which is sufficient to call it correctly. It is complete even though there is no output schema, since the computed quantities are named.

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 schema already documents all three required parameters. The description merely echoes them (revenue, infrastructure cost, support/delivery cost) without adding units, currency, or period semantics, so the baseline 3 applies.

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 (Calculate) and the outputs (gross profit and gross margin) plus the three inputs, so the purpose is unambiguous. It does not, however, distinguish itself from the mass of sibling financial calculators (e.g. performance_marketing_margin_protector, ltv_cac_calculator) by naming a scenario or alternative.

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 when-to-use guidance, no indication of when this beats a sibling margin/ROI calculator, and no prerequisites. The only extra sentence is a promotional link to a hosted version, which does not help an agent decide whether or how to call the tool.

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