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

With no annotations, the description carries the full burden of behavioral disclosure. It only reveals that page content is not stored, but does not state whether the tool makes network requests, what happens to the other parameters, or what the output format looks like. This is insufficient for a tool with 9 parameters and no output schema.

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, highly concise, and front-loads the core action. It avoids fluff, though its brevity contributes to the incompleteness. It earns a high score for efficiency, not for completeness.

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 output schema, and no annotations, the description is severely incomplete. It does not explain the role of the majority of parameters, the return format, side effects (if any), or error conditions. An agent cannot reliably call this tool correctly based on the current description.

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%, so each parameter is individually documented. The tool description adds no extra meaning beyond the schema. It does not clarify how 'url' relates to the others or which parameters are relevant to the stated purpose. The baseline of 3 applies because the schema does the heavy lifting, but the description misses an opportunity to explain the parameter interactions.

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 ('Return') and resource ('host, scheme, and HTTP status for a URL'), which is distinct from many siblings. However, it fails to mention the other eight parameters, leaving the full purpose ambiguous. An agent might be confused about why 'ref', 'city', or 'json' exist, though the core action 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?

No guidance is given on when to use this tool versus the many URL-related siblings (e.g., fetch-status, normalize-url, browser-url-ok). The single statement 'Page content is not stored' hints at a difference but does not explicitly route the agent to an alternative or specify conditions. The agent must infer usage from context.

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