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

With no annotations, the description carries the behavioral burden. It does reveal that the body is discarded and the word 'public' implies no authentication requirement, but it does not explain redirects, failure outcomes, or how the unrelated optional parameters (city, json, zone, query, etc.) are treated.

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?

Two short sentences with zero filler; the core act is front-loaded and the body-discard caveat is placed second. Everything present earns its place.

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, no output schema, and no annotations, the description is far too thin. It does not say which parameter carries the target URL, what happens when multiple parameters are supplied, what the status response looks like, or how to choose this over sibling checkers.

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 coverage is 100%, so each parameter is already documented individually, setting the baseline at 3. The description adds no parameter-specific meaning and does not state which parameter should receive the 'public library docs URL', so it provides no added value beyond the schema here.

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 clearly states the operation: obtain HTTP status for a public library docs URL, and explicitly notes the body is discarded. It is not a tautology and identifies a concrete resource, but it does not distinguish this from sibling URL/status tools and leaves the 9-parameter schema unaddressed.

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 on when to use lib-docs-hint versus siblings such as fetch-status, browser-failure-ok, normalize-url, or web-fetch. The 'body discarded' caveat vaguely hints at status-only use, but no explicit when/when-not criteria are present.

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