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

Annotations already establish readOnlyHint=true and openWorldHint=false, but the description adds real context the annotations cannot: results are sorted newest first, the response includes per-kind counts and the page's allowance, and webhook subscribers are rendered by host rather than full URL (a meaningful data-shape caveat).

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, no filler, with the core purpose front-loaded and the webhook-display caveat kept to a single trailing clause. Every sentence carries information an agent cannot get from the structured 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 output schema and five parameters, the description carries the return-shape burden and largely does so by describing ordering, aggregate counts, and the allowance. It is slightly thin on cursor/pagination behavior, which an agent must infer from the schema's cursor field.

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 enum, limit range, cursor, and status semantics are already fully documented in the schema. The description only echoes one of these indirectly via 'counts by kind', so the baseline of 3 applies.

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?

It names a specific resource ('a page's subscribers') and a specific ordering ('newest first'), which is enough to distinguish it from generic list tools. It does not, however, differentiate itself from siblings like list_pages or get_page_access, and 'page' is left to be inferred as the same page concept used elsewhere.

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 statement of when to reach for this tool versus alternatives such as list_pages or get_page_access; usage is only implied by the list-plus-filter shape. An agent must infer that filtering by kind/status is done here rather than via a narrower sibling.

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