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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description still adds value beyond them by disclosing the returned field set and that results are filtered and paged. It stops short of describing pagination flow or result ordering, which keeps it at 4 rather than 5.

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: trigger conditions first, return payload second, sibling exclusion last. No filler, and the most decision-relevant information is front-loaded.

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?

There is no output schema, so the description compensates by naming the returned fields, and it covers filtering and paging behavior. Nothing an agent needs in order to pick and call this list tool is missing.

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%, including an enum on status and bounds on limit, so the schema carries parameter meaning fully. The description only brushes the parameters with "filtered and paged" and adds no filter syntax or combination guidance, so the baseline 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?

States a specific verb and resource (list monitored sites) and then enumerates exactly what each result carries: status, last check, response time, 24-hour uptime, group, interval and SSL days left. It also distinguishes itself from the nearest sibling by name, so an agent can separate it from get_site without opening either schema.

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?

"Use this when the user asks which websites or APIs they monitor, which are down, slow or paused, or what is in a group" gives concrete trigger phrasings, and "Not for one site's detail: use get_site" supplies the explicit exclusion plus the alternative. Both when-to-use and when-not-to-use are present.

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