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

With no annotations, the description carries the behavioral burden. It does provide one useful behavioral detail: 'Body discarded,' clarifying that the response body is not returned. However, it does not mention network access, error behavior, redirects, rate limits, or which inputs are actually discarded, so the feedback is incomplete.

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 two short sentences, front-loaded with the primary purpose and followed by a useful behavioral limitation. Every sentence earns its place and there is no repetitive or wasted wording.

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 9-parameter tool with no required parameters, no output schema, and no annotations, so the description must carry substantial context. It does not explain the expected return format, whether one field must be supplied, how to select among the many parameter variants, or what 'hint' means in relation to a full fetch. The basic invocation contract is underspecified.

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 description coverage is 100%, so the per-field descriptions already explain each parameter. The top-level description adds no parameter-specific meaning and is even slightly misaligned by mentioning only 'library docs URL' while the schema includes city, zone, json, and query fields. Since the schema carries the semantics, the baseline of 3 is still warranted.

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 and artifact: it returns an HTTP status for a public library docs URL, and clarifies that the response body is discarded. It is clear enough to convey the core purpose, but it does not explicitly distinguish itself from sibling tools like fetch-status or browser-url-ok, so it stops short of a 5.

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 usage guidance is provided: there is no mention of when to use this tool over fetch-status, browser-url-ok, normalize-url, or the other siblings, no prerequisites, and no indication whether one specific parameter among the nine is expected. The agent must infer all routing and invocation context from the schema alone.

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