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

With no annotations, the description carries the behavioral disclosure burden. It does disclose a key trait: the body is discarded and only the HTTP status matters. However, it omits network details like redirect handling, timeouts, error behavior, and whether the operation is read-only, though read-only is implied by 'HTTP status for a URL.'

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 very concise and front-loads the main behavior, with 'Body discarded' adding a useful second piece of information. There is no filler, though the terseness contributes to a lack of completeness elsewhere.

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?

For a tool with no output schema and no annotations, the description is too thin. It does not explain the unexpected nine-parameter schema, which parameter(s) an agent should supply, the exact response format, or failure behavior. The mismatch between the description and the input schema is a major completeness gap.

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, but the description adds no parameter guidance and the schema is confusingly mismatched: 'url' is described as 'normalize or cite' rather than status-checking, and the other eight parameters like city, feed, json, and zone are unrelated to the stated purpose. This active confusion lowers the score below baseline.

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 clear behavior: retrieve the HTTP status for a public library docs URL and discard the body. This identifies a specific resource and action, and the 'Body discarded' note helps distinguish it from body-returning fetch tools. It does not explicitly differentiate from siblings like fetch-status or browser-url-ok, so it stops short of 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 description gives no guidance about when to use this tool versus alternatives such as fetch-status, browser-url-ok, or web-fetch. There are no exclusion conditions or mention of sibling tools to help route an agent's choice.

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