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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds the ordering rule (by opportunity score), which is useful, but it omits how many competitors are compared, whether results are capped or paginated, and what the 'opportunity score' is derived from.

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?

A single compact sentence with the definition front-loaded and the ordering rule appended. Nothing is wasted, though the parenthetical construction makes the ordering rule slightly buried.

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, the description should carry more of the return-value burden — e.g. that each gap includes the keyword, the ranking competitor, and the score. Annotations cover the safety profile, but the agent still cannot predict the shape or size of the result set.

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?

There is a single parameter (site_id) with 100% schema description coverage, so the schema fully documents the input and the description adds nothing parameter-level. The counterintuitive absence of a competitor parameter is not explained, which is the one place the description could have added value.

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 gives a specific resource (keyword gaps) and defines the concept precisely — keywords a competitor ranks for that the site does not — which an agent can distinguish from get_keyword_rankings or get_market_analysis. It stops short of naming sibling alternatives or scoping which competitors are compared, so it is clear but not fully differentiated.

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 when-to-use guidance, no prerequisites, and no mention of alternative tools such as get_market_analysis or get_competitors that also surface competitive keyword data. Usage can only be inferred from the name and the parenthetical gloss.

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