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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It adds the price ($0.015) but does not reveal whether the operation is read-only, what the response contains beyond 'timeline', or any limitations (e.g., time range, granularity). This is insufficient for an API-like tool.

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 a single sentence that front-loads the core function and includes a cost signal. There is no redundant information, making it highly efficient.

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 tool is simple, but the absence of an output schema means the description should explain what the returned timeline actually looks like (e.g., time series format, units, or default period). It only says 'timeline', which is vague and leaves room for ambiguity.

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 schema already describes the query parameter fully ('Topic to get trend data for'), and the description does not add substantial meaning beyond that. The phrase 'interest-over-time timeline' gives context but not specific requirements or formatting details.

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 clearly identifies the action (Get) and the resource (Google Trends interest-over-time timeline) for a specific query. This distinguishes it from sibling tools like search_web and search_news, making its purpose unambiguous.

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 implies the tool is for retrieving Google Trends data, but it does not explicitly state when to prefer it over other search tools or provide exclusion criteria. It lacks explicit alternatives like 'for web search, use search_web instead'.

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