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

The description includes one useful behavioral guarantee: page content is not stored. However, it does not disclose network access, error behavior, response structure, or limits, and no annotations cover these aspects.

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, front-loaded sentences with no redundancy. The core output and a useful privacy-related behavior are stated directly.

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 tool has 9 optional parameters in a single schema, yet the description only addresses the URL use case. It never explains how the other parameters interact, what happens with no arguments, or what the returning data looks like, leaving substantial ambiguity.

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 description only needs to add marginal value rather than carry parameter documentation. It helps by scoping the result to a URL, but the many unrelated optional parameters are not explained in the tool description.

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 concrete outcome: return host, scheme, and HTTP status for a URL, plus a clear note that page content is not stored. It is clear, but it does not explicitly differentiate this from related siblings 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?

No when-to-use or when-not-to-use guidance is provided, and no alternatives are named. Usage is only implied by 'for a URL', which is too weak given the many sibling tools that handle HTTP status and URL operations.

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