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

With no annotations, the description carries the full burden. It discloses that page content is not stored, which is useful, but it does not mention whether the tool makes network requests, requires authentication, has rate limits, or what side effects occur. The fate of the many non-URL parameters is completely unexplained, leaving major behavioral unknowns.

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 extremely concise: two short sentences with the core action front-loaded. It wastes no words. However, it is too brief to cover the tool's complexity, but for pure conciseness it scores well.

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, no annotations, and no output schema, this description is severely incomplete. It does not explain the role of most parameters, the return format (beyond listing three fields), error behavior, or any edge cases. An agent cannot reliably invoke this tool correctly based on the provided information.

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% with all 9 parameters described. The description adds no extra parameter-level meaning, and it does not clarify which parameters are relevant to the stated purpose or how they relate to the URL return. Since the schema already documents each parameter, the baseline 3 is appropriate; the description adds nothing beyond that.

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 clear core action: return host, scheme, and HTTP status for a URL. However, it does not differentiate this from siblings like fetch-status or normalize-url, and the 9-parameter schema includes many fields unrelated to that core (city, feed, json, zone, etc.), creating ambiguity about what the tool actually does. The 'Page content is not stored' note adds a bit of scope, but the purpose remains muddled by the parameter mismatch.

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. There is no mention of prerequisites, exclusions, or comparison to sibling tools like fetch-status or normalize-url. An agent has no way to know if this is the right choice for a given task.

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