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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description usefully adds that the tool is Premium-gated, but it says nothing about rate limits, whether the window is fixed or parameter-driven, or refresh latency.

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?

Two short sentences, front-loaded with the returned data, and the Premium constraint is appended without padding. Nothing here is 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 an output schema present, return values need not be described, and the Premium note is a real addition. However, the unresolved tension between 'last ninety days' and the days parameter (default 30) leaves the agent uncertain how to invoke it correctly.

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 'How many days back' is already documented with a default of 30 and a max of 90. The description's flat claim of 'for the last ninety days' instead conflicts with the parameter's default and makes the agent unsure whether 'days' controls the window or is ignored.

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 names the concrete data returned (daily page views, supporters, amounts, and visitor-to-supporter conversion rate), which is more specific than the vague title 'Read my page numbers'. It does not, however, distinguish itself from the plausible sibling get_dashboard_summary, so an agent gets no routing signal.

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 when-to-use statement, no condition that selects this tool over get_dashboard_summary or get_wrapped, and no exclusions. The only guidance-like content is the 'Part of Premium' access note, which is a prerequisite rather than usage direction.

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