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

With no annotations, the description carries the full burden of disclosing behavior, but it only mentions returning HTTP status and discarding the body. It does not explain redirect handling, timeout behavior, error responses, authentication needs, or what happens when the URL is invalid, leaving significant behavioral ambiguity.

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 brief and free of extraneous wording, with two short sentences that convey the primary action and a key side effect. It could be slightly more structured by naming the relevant input parameter, but overall it is concise and readable.

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 the tool has 9 optional parameters and no output schema, the description is not complete enough for an agent to confidently invoke it. It does not specify which parameter to populate, what the output format will be, or how to interpret failures, so substantial context is missing.

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?

Although all 9 parameters have descriptions, most are inconsistent with the tool's stated purpose. Parameters like city, feed, zone, and query appear unrelated to checking a library docs URL, and several descriptions explicitly say values are 'discarded', which undermines their relevance and makes it unclear which parameter actually drives the tool.

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 that the tool returns an HTTP status for a public library docs URL and discards the body, so the core purpose is somewhat clear. However, it lacks an explicit verb like 'return' or 'check', and 'public library docs URL' is ambiguous, especially given the tool name 'lib-docs-hint' and the presence of sibling tools like fetch-status.

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 almost no guidance on when to use this tool versus alternatives such as fetch-status, web-fetch, or browser-url-ok. The only usage hint is that the body is discarded, which implicitly tells the agent not to use it when response content is needed, but no explicit selection criteria or examples are provided.

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