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

With no annotations, the description carries full burden for behavioral disclosure. It only states that the body is discarded, but does not disclose that parameters like 'ref', 'city', and 'json' are also discarded after shape checks, nor does it explain that the tool appears to serve as a multi-purpose hint validator. The description is silent on output format, error behavior, and side effects.

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 short (two sentences), which could be conciseness, but it is under-specified rather than efficiently scoped. Critical information about the tool's actual behavior and parameter usage is omitted, so the brevity hurts rather than helps. The information that is present (HTTP status, body discarded) is not front-loaded effectively because it doesn't clarify the tool's broader function.

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?

For a tool with 9 optional parameters, no annotations, and no output schema, the description is drastically incomplete. It fails to explain the tool's full scope (which parameters trigger which checks), what the output actually is beyond 'HTTP status', or how to invoke it correctly. An agent cannot reliably select and call this tool based on the given information.

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 tool description adds no parameter-specific meaning beyond what the schema already provides. It does not help the agent decide which of the 9 optional parameters to use or how they relate to the stated purpose, but it does not contradict the schema either.

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 (get HTTP status) and resource (public library docs URL), giving a clear verb and object. However, it is vague about what qualifies as a public library docs URL and entirely ignores the 9-parameter schema, which suggests the tool handles many input types (city, feed, json, path, etc.). This makes the stated purpose narrow and 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 provided on when to use this tool versus siblings like fetch-status, browser-url-ok, or normalize-url. There is no mention of context, prerequisites, or exclusions. The description offers zero routing information.

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