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

With no annotations, the description carries the behavioral burden. It meaningfully discloses the method (HEAD), target visibility (public), and output scope (status only). It stays silent on failure modes, timeouts, and the fact that most schema fields are discarded rather than fetched.

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?

One sentence with no filler; the verb and resource are front-loaded and every word contributes to the core behavior.

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?

The tool has seven parameters and no output schema, but the description covers only the URL case. It does not define what 'status' actually looks like, how the non-URL inputs are handled, or when to prefer this over sibling URL-check tools, so the selection picture is incomplete.

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?

All seven parameters already have descriptions in the input schema, so the baseline is 3. The description adds no parameter-level meaning and narrows the tool to URLs, leaving the relationship of ref, city, feed, json, and path to the operation unexplained.

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 verb (HEAD), resource (public URL), and outcome (status only), so it is not a tautology and is broadly distinguishable from content-fetching siblings. However, it does not distinguish this from sibling URL-check tools like browser-URL-ok or playwright-URL-ok, and it ignores the other parameter kinds in the schema.

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?

'Status only' implies this is for lightweight availability checks, which gives some usage context. But it never names alternatives or states when not to use it, leaving selection among web-fetch, browser-URL-ok, playwright-URL-ok, and normalize-URL to inference.

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