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

Goes well beyond the annotations by disclosing the quota cost per call and the persistence side effect ('stores the result'), which explains why readOnlyHint=false and idempotentHint=false — repeated calls consume allowance again. It does not mention whether an existing inspection is overwritten or how depletion is signalled, but the cost and write behaviour are the key traits an agent needs.

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 tight sentence with the outputs front-loaded and the cost/persistence note trailing. Dense but every clause carries information; slightly telegraphic in the parenthetical breakdown, but no filler.

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 five-parameter, three-required tool with a fully documented schema and no output schema, the description covers what it returns and its cost/persistence behaviour. The missing piece is the explicit routing versus the stored-inspection siblings, which matters in a 40-tool surface.

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 100% with descriptions on all five parameters, including store/platform interplay and the GOOGLE_PLAY_SOURCE deployment requirement, so the schema carries the semantics. The description adds only the 'autocomplete demand' breakdown concept and no additional parameter meaning, matching the baseline 3.

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?

Names a specific verb and resource ('Live keyword inspection') and enumerates what it returns: top apps, traffic/difficulty/KEI scores with breakdown, related keywords. The 'Live' qualifier implicitly contrasts with the stored/cached siblings get_keyword_inspection and list_keyword_inspections, but those siblings are never named, so an agent must infer the distinction.

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?

The cost statement ('Spends one keyword inspection from the monthly plan allowance') signals that this is the expensive, fresh-data path and implies get_keyword_inspection is the cheaper read of stored results, but it never states that alternative or a when-not-to-use condition. Usage is implied through cost rather than declared.

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