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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description adds genuinely new behavioral context: that billing is usage-based with a default estimate of $0.04 and that final cost may vary. That cost disclosure is useful beyond the annotations, though return format, result caps and throttling are still unstated.

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?

It is short, but the space is spent on HTML-commented pricing boilerplate rather than front-loaded functional content. Nothing in it helps an agent decide or correctly invoke the tool.

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?

An output schema exists so return values need not be described, but for a 2-parameter tool with 0% schema coverage the description leaves purpose, parameters and usage entirely unspecified. The pricing note alone is not sufficient context.

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?

Both parameters (required 'phrase' and optional 'database') have 0% schema description coverage, so the description carries the full explanatory burden. It says nothing about what a phrase or database identifier means, valid formats, or accepted values.

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 contains no statement of what the tool does. It only carries a usage-based pricing disclaimer, so an agent must infer the purpose entirely from the name 'get_semrush_paid_results'. It does not distinguish this from sibling get_semrush_organic_results.

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?

No when-to-use, when-not-to-use, or alternative guidance is present. The obvious sibling (get_semrush_organic_results) is never mentioned, and nothing indicates when paid results are the right choice over organic ones.

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