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

Beyond the annotations it discloses a hard rate limit (one call per 10 seconds per destination host, shared across all users) and a meaningful side-effect nuance: the first check produces no alert. That is exactly the kind of context annotations cannot carry, though it does not mention auth requirements or what the response contains.

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?

The rate-limit sentence is duplicated verbatim ('One call every 10 seconds per destination host.' appears twice), wasting a full sentence. The remaining content is well front-loaded and purposeful, but the repetition is a clear editing defect.

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 does enough by explaining that the returned state is the site's first observation and that no alert is emitted. It still omits what fields the response carries, but an agent can call it correctly with what is provided.

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% and both parameters are fully documented in the schema, so the description need not restate them. It adds nothing about `id` or `guest_token` beyond what the schema already says, leaving this at the baseline.

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 first sentence names a specific verb and resource ('Check a site monitor now') and the closing sentence clarifies its role relative to the automatic per-minute check. It stops short of naming a sibling tool it should be chosen over, but the immediate-vs-scheduled distinction is clear.

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?

The description tells the agent when to reach for it: to obtain the first state of a newly created site, and implicitly not to poll repeatedly afterwards since the per-minute check supplies state and alerts. It gives no explicit 'do not use when' clause, but the context is strong enough to guide selection.

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