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

With no annotations, the description must carry the full behavioral burden, but it only mentions that the body is discarded. It does not explicitly state read-only behavior, side effects, HTTP method, or any limitations beyond discarding the body.

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 and parameter descriptions are compact with no redundant phrasing. The single-sentence description is tight and free of fluff.

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 9 optional parameters, no output schema, no annotations, and an unclear purpose; the description does not explain which parameters are primary, how they interact, or what the expected output looks like beyond 'HTTP status'. This leaves substantial gaps for correct invocation.

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?

All 9 parameters have individual descriptions and the schema coverage is 100%, but several descriptions are semantically unrelated to the stated tool purpose (e.g., 'city' for a weather hint). The descriptions add some meaning, but the connection to 'lib-docs-hint' is weak and the 'discarded after' notes do not clarify actual usage.

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 an output ('HTTP status') but lacks an explicit verb and resource relationship; it is unclear whether the tool checks a URL, returns a hint, or performs validation. The phrase 'public library docs URL' is ambiguous and not clearly tied to the provided 'url' parameter.

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 provides no guidance on when to use this tool versus sibling tools like fetch-status, browser-url-ok, or normalize-url. There is no mention of appropriate contexts, prerequisites, or alternatives.

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