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

With no annotations, the description carries the behavior disclosure burden. It does reveal output granularity ('weekly points, peak') and a per-request price, but it omits failure modes, rate limits, and any explicit signal that this is a read-only external fetch. It is adequate but not comprehensive.

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?

The description is one compact sentence that front-loads the core purpose and then gives a concrete example and price. It is lean and scannable, though the undocumented geo parameter in the example slightly reduces precision.

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?

The schema is minimal and has no descriptions, so the description needs to explain required inputs and valid values. It does not state whether q and time are required, what time formats are accepted, or that geo in the example is not represented in the schema. An agent can guess from the example but cannot call the tool with full confidence.

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 0%, so the description must compensate. It partially does: the example implies q is a keyword and time is a duration value, and it adds geo=US as an optional-looking parameter. However, the '12-m|5-y' syntax is unexplained, and geo is not listed in the schema, leaving some ambiguity about accepted values.

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 opens with 'Google Trends interest over time for a keyword', naming the exact resource, metric, and input. The 'weekly points, peak' parenthetical clarifies the output and clearly distinguishes this tool from the sibling api_trends_region and api_trends_related tools.

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 description gives an example query but provides no guidance on when to choose this tool over alternatives. It never mentions api_trends_region or api_trends_related, nor does it state any conditions or exclusions for use.

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