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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds what the agent otherwise would not know: the exact return payload (public URL, custom domain state, component and subscriber counts, plan page limit), which is valuable because there is no output schema. It stops short of noting cost, auth scope, or empty-list behavior.

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?

Three sentences, front-loaded with the trigger, then the return contents, then the exclusion. Every sentence carries distinct information and none restates the tool name or title.

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, the description's enumeration of return fields is what closes the gap, and it does so thoroughly. Combined with the read-only annotations and the zero-parameter schema, an agent has everything needed to select and invoke this tool 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline is 4. The description correctly avoids inventing filter or pagination arguments that the schema does not support.

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?

States a specific verb and resource ('list_status_pages' / 'their public status pages') and immediately enumerates the user questions it answers (which pages, addresses, subscriber counts, custom domain status). It also names the sibling it is not (check_service_status) for the adjacent-but-different case.

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?

Opens with an explicit trigger ('Use this when the user asks about their public status pages') and closes with an explicit exclusion plus the correct alternative ('Not for another company's status: use check_service_status'). Both when-to-use and when-not-to-use are stated, not inferred.

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