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

The description discloses one behavioral trait: 'Body discarded.' But there are no annotations to rely on, so the description bears the full burden of behavioral transparency. It does not mention whether a network request is made, how the URL is normalized, what 'hint' means, or any side effects. The coverage is far too thin.

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 extremely concise—one sentence with no unnecessary words. The information it does include is front-loaded, but the brevity comes at the cost of essential context, so it is concise yet incomplete.

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?

With seven heterogeneous parameters, no annotations, and no output schema, a single sentence is far from sufficient. An agent would not know which parameters are relevant for a 'library docs URL,' what the expected input format is, or what 'hint' implies about the response. The description is inadequate for the tool's complexity.

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?

The input schema provides descriptions for all seven parameters, so schema coverage is effectively 100%. The description itself adds no parameter-level meaning, but the baseline of 3 applies because the schema already documents each parameter individually.

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 clear verb ('HTTP status') and resource ('public library docs URL'), giving a basic sense of the tool's function. However, the tool name 'lib-docs-hint' and the heterogeneous input schema (ref, city, feed, json, path) create ambiguity about the actual scope, and it does not distinguish itself from siblings like fetch-status or browser-url-ok, which also deal with HTTP status and URLs.

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?

There is no guidance on when to use this tool versus alternatives. No conditions, exclusions, or sibling comparisons are provided, so an agent cannot determine whether to choose this over fetch-status, normalize-url, or web-fetch.

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