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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is fully covered without the description. The description's one contribution is "0.5 credit," which discloses a cost/consumption trait not present in the annotations, but it says nothing about rate limits, response shape, or what the suggestions represent.

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?

Two short fragments with zero filler; the purpose statement is front-loaded ahead of the cost note. It is terse to the point of under-specification, but no sentence is 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 simple 3-parameter read tool with full schema coverage and complete safety annotations, the description is minimally sufficient. Gaps remain: it never explains that suggestions are derived from the q prefix, how country/language shape results, or whether the 0.5 credit is per-call, but none of these are strictly required given the schema and annotations.

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 100%, with q ("Search query"), country ("Country code... shared proxy routes") and language ("Does not change country") all documented in the schema. The description adds no parameter meaning beyond that, so the baseline of 3 applies.

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?

"Query suggestions" names the resource (suggestions) but supplies no verb and no scope; it reads as a fragment rather than a statement of what the tool does. An agent can infer this is an autocomplete-style endpoint, but the description does not explicitly distinguish it from the sibling search tool that returns results rather than suggestions.

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 mention of the sibling tools (search, maps, news) it complements, and no prerequisites or exclusions. The only extra text, "0.5 credit," is a cost note, not usage guidance.

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