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

Annotations only declare readOnlyHint=false and openWorldHint=true, so the description does add real context: a single fixed Live POST, no pagination, explicit unknown/missing fields, and result availability in owner call history. However, phrases like 'Execution and publication remain unapproved' are cryptic and do not tell the agent what actually happens on invocation or what output fields to expect.

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 front-loaded first clause duplicates the title, and several follow-on clauses ('Execution and publication remain unapproved', owner-call-history note) read as boilerplate that does not help selection or invocation. The one genuinely useful fact, no pagination / fixed POST, is buried mid-paragraph.

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 3-parameter, no-output-schema tool with no parameter documentation, the description should convey what is returned (keyword list? volume estimates?) and what 'limit' counts. It conveys neither, and does not distinguish this from the many adjacent SEO keyword-volume tools.

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 0%: 'limit' (1-20, default 10) is never explained (rows? keywords?), and the description says nothing about market/language, which are only inferable from their const values. With low coverage the description was expected to compensate and does not.

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 opens by repeating the title verbatim ('High Search Volume Database Keywords'), which is a restatement rather than a statement of purpose. 'Bounded Google database facts' hints at a keyword-volume source, but there is no specific verb and no differentiation from close siblings such as nexscope_seo_clickstream_search_volume or nexscope_seo_keyword_metrics, so an agent cannot tell what distinct result this yields.

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 sentence states when to call this tool, when to prefer a sibling volume/keyword tool, or what preconditions apply. 'Seven-day source-freshness rules apply only to dependent requests' is opaque and does not function as usage guidance.

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