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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds valuable behavior beyond annotations: it promises privacy-safe output and explicitly states that raw IPs and user-agents are never exposed, which is useful for agents handling sensitive data.

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 two efficient sentences with no filler. The core action is stated first, followed by the returned metrics and the privacy guarantee. Every sentence adds value.

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?

For a read-only analytics tool with a full output schema and complete parameter descriptions, this description covers the essentials: what it returns, the optional period, and the privacy constraint. Nothing critical is missing for correct invocation.

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 all three parameters (name, period, siteId). The description reinforces the period default and 'site' concept, but it does not clarify the precedence or mutability between name and siteId. Baseline 3 is appropriate because the schema carries the parameter detail.

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 uses a specific verb ('Return') with a clear resource ('privacy-safe traffic summary for a site') and enumerates the exact metrics included. It is easily distinguishable from sibling tools like get_site or list_sites, which focus on site metadata or enumeration rather than analytics.

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 clearly signals when to use this tool: when you need traffic analytics for a site, optionally over a custom period. It does not explicitly name alternatives or exclusions, but the context is unambiguous enough that an agent would not confuse it with the site-management siblings.

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