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 usefully adds that results include an annual figure and a 30% RPM swing range, which is real value, but it says nothing about precision, rounding, or how the swing band is derived.

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?

A single dense sentence with the primary output front-loaded and no filler. It reads as a noun phrase fragment rather than a complete sentence, which is a minor structural nit but costs no clarity.

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 no output schema, the description carries the return-value burden and discharges it by stating the three figures returned plus the RPM default. Inputs and default are covered by a schema at full coverage, so an agent has everything needed to call it correctly.

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 both parameters are fully documented in the schema. The description's only parameter detail, RPM defaulting to 2, merely restates the schema's own default annotation, adding no new meaning.

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 names a specific computation (estimated YouTube AdSense revenue) with its exact inputs (monthly views, RPM) and the outputs produced (annual figure, RPM swing range). Among a sibling set of unrelated calculators, there is no ambiguity about what this tool computes.

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?

Usage is only implied by the purpose statement; there is no explicit 'use this when' or steering toward alternatives. For a single-purpose calculator whose siblings are all disjoint, this is adequate but bare.

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