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

With no annotations, the description carries the behavioral burden; it does add one useful guarantee ('Page content is not stored'), implying a read-only or privacy-preserving operation. But it does not disclose whether the tool makes a network request, how it handles redirects, whether it stores anything besides page content, or what happens with the other accepted inputs.

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 place the main purpose first and add only the privacy note; there is no filler, repetition, or buried detail. It is appropriately front-loaded and easy to scan.

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?

Given several optional parameters, no required parameters, no output schema, and no annotations, the description is too thin: it does not explain the minimal invocation, the purpose of the non-URL parameters, or how the returned values are formatted. It also does not resolve overlap with nearby URL-oriented sibling tools.

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 the schema already documents every parameter, putting this at the baseline. The description adds no new parameter semantics and does not clarify which optional parameter is the primary one for the stated purpose, beyond mentioning 'URL'.

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 the target resource ('URL') plus three concrete output fields (host, scheme, HTTP status), so an agent can clearly see what the tool produces. However, it does not contrast citation with overlapping siblings such as fetch-status or normalize-url, so it stops short of full 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?

There is no guidance about when to choose citation over fetch-status, web-fetch, or normalize-url, and no mention of prerequisites or exclusions. The phrase 'for a URL' only implies the general input context, not the decision between this tool and its near neighbors.

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