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

With no annotations, the description carries the behavioral burden. It does disclose that the body is discarded and only status/content type are retained, which is valuable. It still omits redirect, timeout, or error behavior details, though the public-URL wording implies no authorization context.

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?

Two short sentences, front-loaded with the action and output, followed by a clear limitation. Every word earns its place; there is no filler or assumption.

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 required fields, no output schema, and no annotations, two terse lines are insufficient. The description does not reconcile the broad schema (ref, city, feed, json, zone, query...) with a tool whose stated purpose is fetching HTTP status/content for a URL, and it leaves the agent to infer how the parameters interact.

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 extra parameter-linking semantics beyond emphasizing a public URL; it does not explain how the city, zone, json, path, or query parameters relate to the status/body-discard behavior. The 3 baseline is appropriate because the schema already documents the parameters.

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 the core outcome—HTTP status and content type for a public URL—and adds a distinguishing detail (body discarded). It does not name the sibling fetch/URL tools or explain why the schema exposes many non-URL parameters, which keeps it from being a 5.

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?

It implies when the tool is suitable: public URL status/content-type checks where the body is not needed. However, it gives no explicit when-not-to-use guidance and does not mention such alternatives as fetch-status, browser-url-ok, or normalize-url.

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