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

No annotations are provided, so the description carries the full burden. It does disclose 'Body discarded,' which is useful, but it omits other essential behavioral traits such as whether a network request is made, the response format beyond 'HTTP status,' and how failures are handled.

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 one short, front-loaded sentence with no filler. However, it is so terse that it under-delivers on needed context, so it loses a point for not being appropriately sized.

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?

This is a nine-parameter tool with no output schema and no annotations, yet the description only covers one apparent mode. An agent cannot determine which parameter to use for different hint checks, what the return value looks like, or when this tool is appropriate relative to the extensive sibling list.

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 schema's parameter descriptions cover 100% of parameters, so the baseline is 3, but the tool description actively narrows the tool to a URL-only purpose while the schema exposes nine heterogeneous parameters (city, feed, json, path, query, etc.). This mismatch makes it harder, not easier, for an agent to understand which parameters are relevant for a given call.

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 specific operation: returning the HTTP status for a public library docs URL and discarding the body. This is clear about the core action, but it does not distinguish the tool from sibling status/URL tools 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 versus alternatives, no exclusions, and no mention of prerequisites. The phrase 'public library docs URL' implies one use case, but the agent is left guessing how this differs from other URL/status tools.

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