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

The description discloses two useful behaviors: the output is an HTTP status and the body is discarded. Since no annotations are present, this partially covers the safety and return-behavior burden, but it leaves out error handling, network side effects, rate limits, and what happens for non-library or malformed URLs.

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 with no filler. The core behavior is front-loaded and the body-discarded detail is relevant and efficiently stated.

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?

Despite a simple surface description, the tool has 9 optional parameters, no annotations, and no output schema. The description gives no indication of which parameter(s) matter, whether unrelated parameters are ignored, or what the exact status return format is, leaving an agent with insufficient context to reliably invoke the tool.

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 schema already documents every parameter. The description adds no parameter-level meaning and its 'public library docs URL' phrasing does not cleanly map to the url parameter's schema description ('HTTPS URL to normalize or cite'), but it also does not need to compensate because the schema is fully covered.

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 tool reports an HTTP status for a public library docs URL and that the body is discarded, so an agent can infer the core operation. However, it does not explicitly name or distinguish sibling tools like fetch-status or web-fetch, and it lacks an explicit verb such as 'returns' or 'fetches'.

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 phrase 'for a public library docs URL' implies the tool is intended for a specific URL category, but there is no explicit guidance on when to use this tool instead of alternatives such as fetch-status, browser-url-ok, or web-fetch. No exclusions or alternative-selection rules are provided.

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