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

With no annotations, the description carries the full burden of behavioral disclosure. It only reveals that the body is discarded, but says nothing about whether a network request is made, how the nine optional inputs are treated, what a successful or failed status looks like, or whether any data persists.

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 short and front-loaded, with no filler or repetition. 'Body discarded' adds meaningful behavioral detail. However, the brevity borders on under-specification given the tool's complexity.

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 9 optional parameters, no output schema, no annotations, and 26 sibling tools, two short sentences are insufficient. The description does not explain which parameter produces the HTTP status, what the return format is, or how this tool relates to its many sibling tools.

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 even without additional description. The description adds a small hint that a URL yields an HTTP status, but it does not clarify the roles of the other eight parameters or how they relate to the stated purpose.

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 names a specific action ('HTTP status for a public library docs URL') and discards the body, so it is not a tautology. However, the 9-parameter schema covers city, feed, host, JSON, path, zone, query, and more, which the description never accounts for, making the tool's actual scope ambiguous and poorly differentiated from siblings like fetch-status or browser-url-ok.

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?

There is no guidance on when to use this tool instead of the many URL/status/shape-check siblings. No exclusions, no alternatives, and no selection criteria are mentioned, so an agent cannot decide between lib-docs-hint and fetch-status, browser-url-ok, or normalize-url.

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