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

Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=true), so the bar is lower. The description still adds real value by disclosing the data source, that entries include rollout duration and ongoing status, and the intended diagnostic pairing — context the annotations do not carry.

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 dense sentences with zero filler; the resource and its contents are front-loaded, and the workflow guidance follows. Every clause carries information an agent would otherwise have to guess.

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?

With no output schema, the description must carry the return-value burden, and it does: it enumerates the update categories and the fields per entry. Slightly incomplete on freshness/cadence and whether results are paginated or how many rollouts are returned, but strong overall for a 2-param read-only tool.

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 the schema already documents both parameters (kind enum and YYYY-MM-DD since, with defaults). The description echoes date/rollout framing but adds no syntax, filtering, or enum semantics beyond what the schema states; baseline 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?

Names a specific resource (Google Search ranking updates) plus its authoritative origin (Google's own Search Status Dashboard) and enumerates the covered update types (core, spam, Discover, reviews, helpful content, incidents). It also states what each entry carries — start date, rollout duration, still-rolling status — so an agent knows exactly what this returns.

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?

Explicitly routes the agent to a sibling: 'Line them up with traffic changes from gsc_search_analytics before blaming (or clearing) the site itself.' That gives a clear use context and names the paired tool, though it does not state any exclusion or when-not-to-use condition (e.g. non-Google search engines).

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