CDN unique visitors report

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

Annotations already cover readOnlyHint=true and openWorldHint=true, so the safety profile is clear. The description adds essentially no behavioral context beyond the annotations: it discloses nothing about pagination, default period behavior, or what unique-visitor metrics are returned. For a report tool with no output schema, this leaves the return shape undocumented.

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?

It is a single terse line with no padding, so it is concise. But it is not front-loaded with a purpose statement – it leads with an API-notation string that would not read well to an agent, and it is arguably under-specified rather than efficiently concise.

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 report tool with no output schema, no annotations describing return format, and a sibling list full of similar report tools, the description is too thin. It does not explain what the report returns, its dimensions, or how it differs from neighboring report endpoints.

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 50%: 'period' is documented in the schema with its enum and default, while 'domain' has only a pattern and no textual description. The description's 'GET /domains/{domain}/reports/visitors?period=' loosely maps both parameters to their API locations, but adds no meaning beyond the schema. Baseline 3 fits.

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 title 'CDN unique visitors report' and the tool name establish that this returns CDN visitor/analytics data, and the '[READ]' tag signals a read operation. However, the description itself is just an API-path notation ('GET /domains/{domain}/reports/visitors?period=') that restates the tool rather than describing what a 'visitors report' contains. It doesn't distinguish this from siblings like get_cdn_traffic_report or get_cdn_geo_report.

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 guidance on when to use this tool versus the numerous other CDN report tools (traffic, geo, response time, status). The description provides no context, exclusions, or alternatives, leaving an agent to infer usage purely from the name.

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