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

Annotations already establish readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description goes further and discloses meaningful caveats: the sample is capped at the most recent 100 visits, visits are not unique people, active time is approximate, and no reader emails are returned - exactly the kind of data-quality/PII context an agent needs.

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?

Three short sentences, front-loaded with the purpose statement followed by the caveats. Every sentence conveys distinct information (scope of sample, non-unique visits, approximate time, no PII), with no filler.

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 carries the burden of explaining the return and does so reasonably: it names daily/browser views, aggregates, the 100-visit sample window, and the absence of reader emails. It stops short of describing the shape of the aggregates or the time window covered, which would have made it complete.

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% and the single required 'id' parameter carries no description. The description never mentions the parameter, but given the sibling naming convention (get_document, delete_document) the identifier is easily inferred, so this is a minor rather than fatal gap.

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 states a specific verb and resource: it shows views and aggregates, with the qualifying detail that they are daily/browser breakdowns. It implicitly targets a single document (matching the id parameter and the get_document_* sibling family), so an agent can distinguish it from get_document or list_documents, though it never literally names the resource.

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?

There is no explicit when-to-use instruction and no mention of alternatives such as get_document or get_document_sharing. Usage is only implied by the word 'Show … views', which leaves the agent to infer that this is the analytics tool rather than a content-retrieval tool.

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