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

No annotations are provided, so the description carries the behavioral burden. The sentence 'Page content is not stored' is a meaningful privacy and side-effect guarantee. However, the description does not disclose broader behaviors such as how the other parameters are handled, network requirements, or any rate limits.

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 brief, front-loaded, and free of filler. The second sentence earns its place by stating the non-storage policy. Given the breadth of parameters, it is somewhat under-informative, but structurally it is efficient.

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?

The definition is incomplete for a tool whose schema exposes seven heterogeneous parameters and no output schema. It explains only the URL/host/scheme/status use case and never hints at how ref, city, feed, json, path, or host fit into the tool, leaving an agent reliant on sparse schema hints.

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?

The input schema already provides descriptions for all seven parameters, including discard behavior, so schema coverage is high. The tool description adds little beyond reinforcing the URL parameter and does not clarify how the other parameters relate to the operation.

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 first sentence states a specific, observable outcome: return host, scheme, and HTTP status for a URL. It is clear about the core operation, but it does not explicitly distinguish itself from siblings like normalize-url or fetch-status, and it ignores several schema properties.

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?

The description provides no guidance on when to use this tool instead of alternatives such as fetch-status, normalize-url, web-fetch, or validate-json. The URL use case is implied, but no exclusions or selection criteria are offered.

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