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

Annotations already declare readOnly=true, idempotent=true and non-destructive, so the safety profile is covered. The description earns credit for adding unit-consumption cost disclosure and the account-selection mechanism, but it omits what happens if both account identifiers are supplied, and any rate-limit or partial-result behavior.

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?

Three short clauses, each carrying a distinct fact: read/cost tag, what is fetched and its scope, and the cost/auth detail. No filler and the key scoping information comes first.

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 three-parameter, no-output-schema read tool this covers the essentials: what is retrieved, what it costs, and how to authenticate. What is missing is trivial-but-useful detail such as whether an empty domain is valid (schema default is "") and roughly what the returned sections contain.

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 coverage is 0%, so the description must compensate and it only partially does. "Account by `semrush_account_id` or `semrush_account_uuid`" usefully signals the two identifiers are alternatives, and "root domain" hints at the domain format, but nothing states precedence when both are given or that every parameter is optional per the schema.

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 the resource (Semrush backlinks) and the two payloads returned: an overview plus a backlink list, scoped to a root domain. That clearly separates it from semrush_domain and semrush_units, though it does not explicitly disambiguate from similarly named siblings like list_external_backlinks.

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 explicit when-to-use guidance: nothing says when to pick this over semrush_domain, semrush_units, or list_external_backlinks. The only directive is a cost signal ("Consumes API units" / "[read · spend]"), which warns about spend but does not route the agent between alternatives.

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