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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description's genuine additions are the per-call cost ('1 credit') and the single-keyword/single-country constraint, which hint at a one-shot rather than batch operation, but return format and result limits remain undisclosed.

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 fragments with no filler; cost is placed early and the scope constraint is front-loaded. Slightly telegraphic, but nothing wasted.

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 read-only snapshot tool with no output schema, the description usefully summarizes the return content (organic results + local pack) and cost, but says nothing about result volume, pagination, or device/locale handling that an agent may need.

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 67%, so the schema already explains brand and country in detail. The description reinforces that keyword and country are singular ('one keyword in one country') but adds nothing about format or syntax beyond 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?

States a specific resource: Google organic results plus the local pack, scoped to one keyword and one country. It is clear what the tool returns, though it does not name or contrast a sibling (e.g. keywords_for_domain or teardown) that could plausibly overlap.

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 condition for selecting this over keywords_for_domain, teardown, or competitor_ads_google, and no mention of prerequisites. The '1 credit' note is a cost disclosure, not usage context.

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