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

With no annotations, the description carries the behavioral burden. It discloses one useful trait — page content is not stored — but it does not describe network access, redirect handling, error behavior, or why eight of nine schema parameters are accepted as optional/discarded 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 tight sentences with no filler; the primary output is front-loaded and the privacy note is placed second. Every word earns its place.

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?

This is a sparse definition for a tool with nine optional parameters, no required params, no output schema, and many overlapping siblings. It lacks selection guidance, parameter-priority guidance, and any sense of the return shape or failure modes, so an agent is under-equipped to invoke it correctly beyond the single 'url' case.

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 baseline is 3; the parameter descriptions already document each field. The tool description adds the output concept (host, scheme, HTTP status) but does not clarify which of the nine optional parameters is primary, though 'url' is the obvious candidate from 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?

The description names a concrete output — host, scheme, and HTTP status — for a URL, so the core operation is clear and goes well beyond the tool name. 'Page content is not stored' adds a distinguishing trait, but it does not explicitly contrast with sibling tools such as fetch-status or normalize-url.

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 when-to-use or when-not-to-use guidance. With overlapping siblings (fetch-status, normalize-url, web-fetch), an agent cannot tell why citation should be chosen over them, and no exclusions or alternatives are mentioned.

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