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

The description discloses that the body is discarded, which is useful, but it does not mention whether the request is read-only, follows redirects, handles errors, or which input parameter matters. With no annotations, the description carries the full behavioral burden and only partially meets it.

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 — two sentences, front-loaded with the core purpose. Every sentence earns its place, but it is so brief that it omits important context that could be provided without compromising conciseness.

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 9 optional parameters and no output schema, this description is incomplete. It does not specify which parameter to use, what counts as a public library docs URL, what the returned HTTP status looks like, or how this tool differs from similar siblings. An agent would need significant inference to call it correctly.

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 input schema has full descriptions, so the baseline is 3, but the main description adds no parameter guidance. It also fails to resolve a conflict: the schema's 'url' description says 'normalize or cite,' while the tool description says 'HTTP status,' so the agent cannot confidently identify the correct parameter for this tool's 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 states a specific action — returning the HTTP status — for a specific resource type (public library docs URL). It is clear and informative, though it does not explicitly differentiate this tool from siblings like fetch-status or web-fetch, which also deal with HTTP statuses.

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 given about when to use this tool versus alternatives. The description simply states what the tool does, leaving the agent to infer whether to choose this over fetch-status, browser-url-ok, or web-fetch based on the 'public library docs' qualifier.

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