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 does reveal that the body is discarded, which is useful, but it omits other behavioral details such as redirect handling, status-code semantics, error behavior, or what happens for inputs not matching the library-docs theme.

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 zero filler. The main result is front-loaded ('HTTP status') and the important constraint ('Body discarded') follows immediately, making it easy to parse.

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 nine optional parameters, no output schema, and no annotations, yet the description only addresses a library-docs URL use case. It does not explain which parameter to provide, what happens with other supported inputs, or what the output format is, so an agent cannot reliably invoke it across its documented scope.

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 schema already documents every parameter, which justifies the baseline score. The description adds no additional parameter meaning, and its 'public library docs URL' framing actually conflicts with the schema's broad mix of weather, JSON, feed, query, and host parameters.

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 the core outcome clearly: return the HTTP status for a public library docs URL, and notes that the body is discarded. However, it lacks an explicit verb like 'returns' or 'checks', and does not compare against similar sibling tools such as fetch-status or browser-url-ok, so differentiation is only partial.

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 rather than alternatives like fetch-status, web-fetch, or normalize-url. The description also does not clarify which of the nine parameters is relevant for the stated library-docs purpose, leaving invocation context to inference.

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