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

No annotations are provided, so the description carries the full burden. It does disclose that 'Page content is not stored,' which is a useful privacy detail, but it omits any mention of the other parameter-driven behaviors (e.g., weather hints, JSON validation, timezone checks) implied by the schema. This creates a misleading impression that the tool only works on URLs.

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 description is a single sentence with no filler. It front-loads the core action and even adds a relevant privacy note. It is appropriately concise and well-structured.

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 tool with 9 parameters and no output schema or annotations, this description is severely incomplete. It does not explain the return format, how to use the parameters, or any constraints. An agent would lack essential information to call this tool correctly beyond the most trivial URL case.

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 each parameter has a description, so the baseline is 3. However, the tool description adds no meaning beyond the schema and fails to connect the extra parameters (city, feed, json, path, zone, query) to the stated purpose. It actually introduces confusion about how these parameters relate to returning host/scheme/status.

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 clearly states a specific verb and resource: 'Return host, scheme, and HTTP status for a URL.' This is not a tautology. However, it does not differentiate from sibling tools like fetch-status or browser-url-ok, and the input schema includes many unrelated parameters (city, feed, json, etc.) that suggest a broader scope, which muddies the purpose.

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 offers no guidance on when to use this tool versus alternatives. It does not mention exclusions, prerequisites, or contextual triggers. An agent would have no idea if this is the right tool for a given task beyond the literal URL citation scenario.

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