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

Annotations only declare openWorldHint=true and readOnlyHint=false, so the description must clarify the read/mutation profile and it does not — an agent could plausibly read "facts" as harmless while the annotation says not read-only. The added notes (missing values are not zero, prices/publication unapproved, call history retention, seven-day freshness) hint at real behavior but use undefined terms like "owner-only results" and "dependent requests".

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 a redundant title echo and cryptic policy boilerplate rather than on the operation. The lead sentence carries no information about what is being fetched.

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, no parameter documentation, and annotations that give little away, the description is the only place an agent could learn the inputs and return shape — and it supplies neither. Effective pagination, category matching semantics, and result contents are all unspecified.

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% across five parameters, and the description says nothing about categoryIds, limit, market, language, or the ALL/ANY categoryMatch enum. An agent gets no semantic help for any input beyond the raw JSON types and consts.

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 restating the title ("Category Keywords") and never says what the tool actually returns — presumably keyword facts for the supplied category IDs. Phrases like "Bounded Nexscope database facts" are opaque, and nothing distinguishes it from siblings such as nexscope_seo_keyword_categories or nexscope_seo_domain_categories.

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 statement of when to use this tool, when not to, or which sibling to pick instead. "One fixed task; no pagination" is a constraint, not usage guidance, and is not explained in terms an agent can act on.

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