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

The sentence 'Page content is not stored' adds a meaningful privacy disclosure that the annotations (none) do not provide. However, the description never states that it makes an HTTP request to the URL, how failures/timeouts are handled, or what side effects occur — significant gaps given no annotations exist.

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 no filler; the core behavior is front-loaded and the privacy note earns its place. Minimal size works here because the schema carries parameter documentation.

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 no annotations and no output schema, the description is the only behavioral source, but it ignores the json and zone parameters and gives no sense of required inputs or error behavior. An agent cannot reliably determine whether url alone suffices or what roles the other parameters play.

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 schema already documents all four parameters, establishing the baseline. The description maps only the url parameter and even creates ambiguity by listing 'host' as an output while host also appears as an input property in the schema.

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?

States a specific verb ('Return') and resource ('URL') with concrete outputs (host, scheme, HTTP status). However, it does not differentiate from sibling tools like url-checks or status-catalog, and it is silent on the other input parameters (json, zone).

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 explicit guidance on when to use this tool versus siblings such as url-checks, normalize-url, or validate-json. The context for use must be inferred entirely from the tool name and output list.

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