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

Annotations already declare readOnlyHint=true, openWorldHint=false, and idempotentHint=true. The description adds useful behavioral context beyond that: account scoping, the fixed 30-day window, 'real' traffic metrics, and the inclusion of current visitors, though it omits auth, rate-limit, or multi-site behavior details.

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 definition is front-loaded with the core purpose and contains no filler, but the metric enumeration is a single very long sentence. The length is mostly justified because there is no output schema to document return fields.

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 parameters and no output schema, the description does a good job enumerating what the overview returns and the time window. It is slightly incomplete about how the 'tracked website' is chosen when an account has multiple sites, which is relevant given the list_sites sibling.

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?

This tool has zero parameters, so parameter semantics are not a meaningful differentiator and the baseline is 4. The long list of metrics describes return values rather than input parameters, which is appropriate given the empty schema.

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, 'get' and 'website traffic overview,' and scopes it to the signed-in account's tracked website over the last 30 days. It clearly distinguishes itself as a broad overview rather than a day-level investigation, though it does not explicitly name siblings.

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?

Usage is implied by 'overview' and the 30-day window, but the description does not explicitly say when to use this instead of investigate_traffic_day, generate_ai_insight, or list_sites. No exclusions or prerequisites are stated.

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