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

With no annotations provided, the description carries the transparency burden. It usefully discloses that page content is not stored, and it states the exact returned information. It does not cover network behavior, redirects, or failure modes, but the non-storage disclosure is meaningful and non-obvious.

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 short sentences with the main action front-loaded and the behavioral qualifier second. Every sentence earns its place; there is no filler or repetition.

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 description gives the core return values and a privacy-relevant behavior, which is helpful given there is no output schema. However, with 9 optional parameters and no required parameters, there is lingering ambiguity about how to invoke the tool correctly, and error behavior is not described.

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?

All 9 parameters already have descriptions in the input schema, so the schema coverage is 100% and the baseline is 3. The description adds only 'for a URL' and does not clarify which optional parameter is primary or how the unrelated-looking 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 description identifies a concrete operation: 'Return host, scheme, and HTTP status for a URL.' This is a specific verb and resource, and it is not a tautology of the tool name. It does not explicitly differentiate from sibling tools like fetch-status or normalize-url, so it falls short of a 5.

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 statement 'Page content is not stored' lightly implies use for lightweight metadata checks rather than full content retrieval. However, it does not explicitly say when to use citation versus fetch-status, web-fetch, or normalize-url, and it offers no when-not-to-use guidance.

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