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

No annotations exist, so the description must carry the behavioral disclosure burden. It only states that page content is not stored, but fails to explain the fate of the other 8 parameters (e.g., 'discarded' hints are in the schema, not the description) or any side effects, permissions, or rate limits.

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?

A single, front-loaded sentence that presents the core purpose immediately. It is concise and avoids filler, but the brevity sacrifices necessary context for the broader schema.

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 9 parameters, no output schema, and no annotations, the one-line description is grossly insufficient. It covers only the URL-centric function while ignoring the other 8 parameters that appear to be validated or discarded. An agent cannot reliably infer how to invoke the tool for the non-URL cases.

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%—every parameter has a description in the schema. The tool description adds no meaning beyond the schema; it only implicitly references the 'url' parameter. Given the high schema coverage, a baseline 3 is appropriate.

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 ('Return') and resource ('host, scheme, and HTTP status for a URL'), which is clear for the URL-citation case. However, it does not differentiate from siblings like fetch-status or normalize-url, and the input schema includes many unrelated parameters (city, feed, json, path, zone, query) that muddy the tool's actual scope.

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?

No guidance is provided on when to use this tool versus alternatives. The description does not mention any exclusions, prerequisites, or hints about which sibling tools might be more appropriate for specific tasks.

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