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

With no annotations, the description carries the full behavioral disclosure burden. It reveals that the body is discarded, but does not disclose that only the 'url' parameter is meaningful while the other eight parameters appear to be ignored or unrelated. The wide array of parameters (city, feed, json, zone, etc.) contradicts the narrow 'public library docs URL' scope, and this mismatch is left unexplained. No side effects, authentication needs, or rate limits are mentioned.

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 a single sentence that is concise and front-loaded with the core purpose. It avoids fluff and gets straight to the point. However, it omits essential details, but conciseness is about length and structure, not completeness, so a 4 is appropriate.

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?

Given the complexity of 9 parameters, no output schema, and no annotations, the description is markedly incomplete. It does not specify which parameter is the target URL, how the other parameters are handled, or what the exact return value looks like (beyond 'HTTP status'). An agent would struggle to call this tool correctly, especially with the seemingly unrelated parameters.

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 baseline is 3. The description adds no parameter-level meaning; it does not even indicate which parameter is the URL or that other parameters are disregarded. The schema descriptions themselves are informative, but the tool description offers no additional clarification, leaving the agent to infer that 'url' is primary based on the prose.

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 a specific action and resource: 'HTTP status for a public library docs URL.' It is a distinct verb-resource pair. However, it does not differentiate from sibling tools like fetch-status or browser-url-ok, which also report HTTP status. The name 'lib-docs-hint' suggests a hint rather than a direct status, but the description is unambiguous.

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 this tool versus alternatives. The description only states what it does, with no mention of conditions, exclusions, or preferred scenarios. An agent cannot decide between this and sibling HTTP-check tools based on this description.

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