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

readOnlyHint=true already tells the agent this is a safe, non-mutating read. The description adds the useful detail that results are reference data (region, IPs, status) and maps to the underlying endpoint, but says nothing about rate limits, pagination, or whether the endpoint requires auth or a paid plan.

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?

One front-loaded sentence delivering purpose plus return fields, followed by a short endpoint mapping. The 'StatusCake: GET /pagespeed-locations' line is traceability rather than agent-facing guidance, but it costs little.

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 parameterless-in-practice read tool with readOnlyHint set, a fully documented single param, and no output schema, the description covers what the agent needs. Only the absence of sibling routing guidance (uptime vs pagespeed locations) is a minor gap.

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%, with the single 'location' parameter fully documented in the schema including ISO 3166-1 alpha-2 format and an example. The description adds no parameter detail, so the baseline 3 applies since the schema already does the work.

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 ('List') and resource ('pagespeed monitoring servers') and even enumerates the returned fields (region, IPs, status), so the agent knows exactly what comes back. The 'pagespeed' qualifier implicitly separates it from statuscake_list_uptime_locations, but the sibling is never named.

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?

Usage is only implied: an agent can infer this supports choosing a region/location for pagespeed checks. There is no statement of when to use this versus statuscake_list_uptime_locations, nor any prerequisite (e.g. auth) or exclusion.

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