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

Annotations already indicate readOnlyHint, idempotentHint, and destructiveHint. The description adds value by stating the tool is 'privacy-safe' and 'never exposes raw visitor IPs or user-agents,' providing behavioral guarantees beyond the annotations. No contradiction exists.

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 sentences, front-loading the core action and listing key outputs concisely. Every sentence adds value: the first details what is returned, the second adds a privacy guarantee. No unnecessary words.

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?

Given the tool has annotations for safety and an output schema, the description fully covers what the tool does, including specific metrics and the privacy constraint. It is complete for a read-only, idempotent analytics query 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 coverage is 100%, so the schema already describes all three parameters. The description mentions the 'period' parameter with its default, matching the schema. It does not add new meaning or constraints for 'name' or 'siteId'. Baseline 3 is appropriate.

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 clearly specifies the tool returns a 'traffic summary' for a site, listing detailed metrics like page views, visitor count, and breakdowns. The verb 'Return' and resource 'site traffic analytics' are explicit. The tool is unique among siblings, as none other provide analytics data.

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 implies usage for obtaining site traffic analytics, but does not explicitly exclude alternatives or specify when not to use it. Given the unique nature of the tool among siblings, the context is clear enough, but lacks explicit when-to-use versus other tools.

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