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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is fully covered. The description adds that the comparison explicitly includes ramp-up cost before impact, which is useful scope context, but says nothing about output or assumptions.

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 purpose is front-loaded in the first sentence; the second sentence is a short pointer to the full calculator. Efficient overall, though the external link is closer to promotion than task-enabling information.

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 no output schema, the description should ideally state what it returns (e.g., the two cost figures or a break-even point). It implies a cost comparison but leaves the actual outputs unspecified, and there is no annotation beyond read-safety to fill the gap.

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% with all five required parameters individually documented (salary, loadedPct, rampMonths, recruiting, fractionalMonthly). The description adds no parameter-level detail beyond the schema, 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 (compare) and resource (loaded annual cost of a full-time CMO vs a fractional CMO retainer) with a clear scope that includes ramp-up cost. Against the large sibling list of calculators, the topic is distinctly identifiable without opening the schema.

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 gives no when-to-use or when-not-to-use guidance, and names no alternative tool for related budgeting decisions. The only extra sentence points to an external 'full version', which is a link, not usage direction.

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