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

The only behavioral note is that page content is not stored, offering minimal transparency. Other potential side effects, error behaviors, or data handling are not mentioned, and no annotations exist to fill the gap.

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 extremely concise, consisting of a single sentence that states the core function and one caveat. It is efficient and well-structured.

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?

Given the tool has nine optional parameters and no output schema, the description is severely incomplete. It fails to explain which parameter is required for the core function, how the other parameters affect behavior, or what output format to expect.

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 description does not clarify any of the nine parameters. The schema descriptions are generic and seem unrelated to the stated purpose (e.g., 'ref' as a Git ref name), so the tool's actual inputs remain ambiguous.

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 clearly states the tool returns host, scheme, and HTTP status for a URL, which is a specific and actionable purpose. However, it does not explicitly identify which parameter is the URL, though 'url' is an obvious candidate.

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 guidance is provided on when to use this tool versus alternatives. The description lacks any comparison to sibling tools or contextual triggers for its use.

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