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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds the useful scoping fact that only one widget is returned rather than the full Explore payload, but says nothing about rate limits, auth, or result shape.

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?

A single front-loaded sentence with no filler; the scoping constraint ('only the Rising ... widget') leads and every word earns its place.

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?

An output schema exists and the schema fully documents parameters, so the description need not restate returns. Its one job is to signal that this endpoint yields just the Rising queries widget, which it does clearly; a bit more on when to prefer it over the umbrella explore tool would complete it.

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%, so all 8 parameters including keywords, geo, and time_range are already documented. The description's 'one or more ... terms' mildly reinforces that keywords accepts a list, which is the baseline-3 expectation when the schema does the heavy lifting.

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 verb (returns) and a precisely scoped resource (the Rising related queries widget) for Google Trends Explore terms. This distinguishes it from the broader google_trends_explore and from top_queries/related_topics siblings, though it does not name those siblings explicitly.

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 phrase 'only the Rising related queries widget' implies this is the narrow alternative to the full explore, but there is no explicit when-to-use statement, no prerequisites, and no named alternative the agent should pick instead.

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