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

With no annotations, the description carries the full burden of behavioral disclosure. It only states that the body is discarded, which is a minor detail. It does not indicate whether the operation is read-only, whether it has side effects, requires authentication, or has rate limits. The schema descriptions mention 'discarded after the check' for several parameters, but the main description does not summarize this broader no-side-effect behavior.

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 terse, which is a form of under-specification rather than effective conciseness. It omits critical information about the tool's actual scope and behavior, so the single sentence does not earn its place by conveying necessary details.

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 tool has 9 parameters, no annotations, and no output schema, the description is severely incomplete. It does not explain how the parameters relate to the stated purpose, what the tool returns beyond a status code, or when to use it. An agent would have to inspect all parameter descriptions to infer the tool's actual behavior, which is excessive.

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 each parameter is individually documented. The main description adds no parameter-level meaning, but it also does not contradict the schema. The baseline of 3 applies because the schema already provides sufficient semantic detail for each parameter, even though the description's narrow 'library docs' framing does not align with the parameter set.

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 (getting HTTP status for a public library docs URL) and mentions the body is discarded. However, it does not differentiate this from siblings like fetch-status or browser-url-ok, and the broad set of 9 parameters (city, zone, json, etc.) suggests the tool has a much wider scope than 'library docs URL' implies, making the stated purpose potentially misleading.

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 the many siblings such as fetch-status, normalize-url, or browser-url-ok. The description does not mention prerequisites, exclusions, or the conditions under which this tool is preferred, leaving the agent to guess.

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