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

With no annotations present, the description carries the full burden. It does disclose one key behavior proactively: the tool returns only the HTTP status and discards the body. However, it is silent on error behavior, redirects, network assumptions, and why so many unrelated parameters like city, json, path, and zone are present, leaving the behavioral picture incomplete.

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 only two sentences and has no filler. The core outcome is front-loaded, and 'Body discarded' adds a useful behavioral detail without extra words. It is arguably under-specified for the schema complexity, but it is structured well and each sentence earns its place.

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?

There is no output schema, no annotations, and nine optional parameters, so the description carries a heavy completeness burden. It says the tool returns an HTTP status but does not explain the response shape, which parameter is intended, or what happens if multiple/unrelated parameters are supplied. The definition is not complete enough for safe invocation.

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 parameters already carry their own meaning; the baseline is appropriately set at 3. The tool description adds no per-parameter clarity and merely points toward the URL concept. Given nine optional parameters, the description should at least tell the agent which parameter is relevant, but it does not.

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 concrete operation—HTTP status—for a specific resource, a public library docs URL, and notes that the body is discarded. This is more specific than generic 'check URL' and distinguishes it from content-returning siblings such as web-fetch. It does not explicitly contrast it with fetch-status, browser-url-ok, or normalize-url, so sibling differentiation is incomplete.

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 when-to-use/when-not-to-use guidance and no mention of alternatives. 'Body discarded' implies the tool is status-only, but the description never tells the agent to choose this over fetch-status, web-fetch, or the url-ok tools when a different kind of result or behavior is needed.

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