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

Annotations already cover read-only, idempotent, and non-destructive behavior. The description adds valuable operational context: billing at $0.36 per row (up to 20 rows, header excluded), no charge for 4xx/5xx errors, and semicolon-delimited text response format. These details go beyond annotations and help the agent anticipate costs and output format.

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 extremely concise, with the purpose stated first, followed by billing details and response format. No extraneous words; every sentence adds necessary information. This is a model of efficient front-loaded structure.

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 2-parameter tool with an output schema, the description covers the essential operational aspects: what it returns, cost, row limit, error billing, and response format. The output schema handles field details, so nothing critical is missing. A small gap is the lack of any note on authentication or rate limits, but these are often covered by the platform 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?

Schema description coverage is 100%, with clear descriptions for target and target_type. The description does not add further parameter semantics beyond what the schema already provides, so it meets the baseline without elevating it.

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 clearly states the tool returns domains with a backlink profile similar to the target, which is a specific verb+resource. It does not explicitly distinguish itself from siblings like get_semrush_backlinks or get_semrush_referring_domains, but the phrase 'similar to the target' conveys the core purpose unambiguously.

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 guidance is provided on when to use this tool versus alternatives. The description does not mention any context for selection, such as 'use this for competitor analysis' or point to sibling tools. The agent is left to infer from the name and description alone.

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