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

With no annotations, the description must carry the behavioral burden; it does disclose a meaningful data-retention trait ('Page content is not stored') and implies a non-mutating URL check. It still omits explicit mention of the network request, failure behavior, or any rate-limiting/auth requirements.

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 two sentences with the core output front-loaded and no filler. It is compact, though the minimal structure feels thin relative to the nine-parameter schema.

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 leaves too much to inference: it does not describe the return shape, error handling, or when to choose this tool over fetch-status and normalize-url. The additional schema parameters are unexplained in context, so the agent cannot fully understand tool boundaries.

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; every parameter has an individual description. The tool description adds little parameter meaning and does not clarify which of the nine optional parameters are actually relevant to the citation check.

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 states a specific operation: 'Return host, scheme, and HTTP status for a URL.' This is clear and not tautological, but it does not explicitly distinguish the tool from URL-focused siblings such as normalize-url or fetch-status.

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 alternatives or selection conditions are given. 'Page content is not stored' implies a privacy-oriented use, but the description never says when to prefer this tool over other URL/status tools.

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