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

Annotations only cover read-only/idempotent/open-world semantics, and the description adds substantial behavioral context beyond that: the independent server vantage points, the automatic Boston fallback for geo-blocked sites, the 30-second per-domain cache, and the user-report count. These are operationally relevant facts an agent could not infer from the structured fields.

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 sentences, front-loaded with the core action before the return-value inventory. The first sentence is dense but every clause carries information; it is slightly long rather than padded.

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 compensates by enumerating what comes back (verdict, status code, latency, resolved IP, redirect target, other-region view, report count) and discloses the caching window. Nothing essential for correct invocation or interpretation 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 coverage is 100%, so the schema itself already documents that scheme, path, port and query are ignored and the host is checked as given. The description adds no additional parameter meaning, 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?

The description states a specific verb and resource (live up/down check of any public website) with explicit scope and vantage point (independent server, Singapore with Boston fallback). An agent can immediately distinguish this from siblings like site_history (historical) or list_outages (aggregate reports).

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 'live' framing and 'check any public website' context make the usage scenario clear, and the geo-block fallback signals the intended coverage. However, it never explicitly names when to prefer a sibling such as site_history for past incidents, so the routing guidance is implied rather than stated.

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