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

With no annotations, the description carries the burden, and it does add one useful behavioral disclosure: 'Page content is not stored.' It does not describe what happens to the many other accepted schema fields, response shape details, or error behavior, but for a read-only metadata check the non-storage statement provides meaningful transparency.

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 short sentences with the substantive output front-loaded and the privacy note second. Every sentence earns its place; there is no fluff.

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?

Despite a 9-parameter schema with zero required fields and no output schema or annotations, the description only covers one URL use case. It leaves the agent to guess whether the other parameters are valid and what happens if multiple are supplied, so the definition is not complete for correct invocation.

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 baseline is 3. The description contributes the output semantics for the 'url' parameter but does not clarify that the other eight optional parameters are irrelevant or how they should be combined, which is a real gap given 0 required parameters.

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 uses a specific verb ('Return') and names a concrete resource ('host, scheme, and HTTP status for a URL'), so an agent can tell what the tool produces. It does not name any sibling tool or explicitly contrast itself with fetch-status or normalize-url, so it stops short of full sibling differentiation.

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 about when to choose this tool over the many URL- and fetch-related siblings, nor about prerequisites. 'Page content is not stored' hints at a use case, but there is no explicit when-to-use or when-not-to-use statement.

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