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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description's only added context is a cost estimate ($0.012 default) and the caveat that it is not a fixed price, which is genuinely useful but far short of disclosing what the call returns or any lookup semantics.

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 it is short because it says nothing relevant to tool selection — the entire body is billing boilerplate in HTML comments rather than a front-loaded purpose statement. The content does not earn its place in a tool definition.

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 zero-argument lookup tool with an output schema, the agent still needs to know what the returned location list is for and how it pairs with the gads search endpoints. None of that appears; the description is effectively absent as functional documentation.

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?

The tool takes zero parameters, so per the baseline there is nothing for the description to clarify and the schema is trivially complete. No parameter-related information is missing because no parameters exist.

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 contains no statement of purpose whatsoever — it is entirely a pricing/usage-billing notice wrapped in HTML comments. Only the title hints at the resource ('Google Ads Search Locations'), and the description never says it returns a list of locations usable for gads SERP queries.

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?

No when-to-use, when-not-to-use, or alternative guidance is given. Nothing distinguishes it from siblings like get_dataforseo_serp_gads_advertisers_locations or post_dataforseo_serp_gads_search_live, leaving the agent to infer routing from the name alone.

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