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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The description only says 'HEAD a public URL and return status only' – it does not reveal that most parameters are 'discarded' or that some involve no network access (path), nor does it mention potential side effects or response format. This is severely under-disclosed for a tool with 9 parameters.

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 a single sentence with no wasted words, but it is under-specified rather than appropriately concise. It front-loads the core action but omits essential context about the parameter set and tool scope, making it structurally incomplete.

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 and no output schema, the description is grossly incomplete. It fails to explain the purpose of most parameters, the tool's relationship to sibling tools, or what 'status' means. An agent cannot reliably select or invoke this tool based on the current description.

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?

The schema descriptions cover 100% of parameters, providing individual semantics (e.g., 'discarded after the shape check'). The description itself adds no parameter-specific meaning, which is acceptable given the high schema coverage. Baseline of 3 is appropriate.

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 clear verb ('HEAD') and resource ('public URL') with a specific output ('status only'), but it does not distinguish this tool from siblings like browser-url-ok or playwright-url-ok that also check URL health. It also ignores the 8 other parameters (city, feed, json, etc.), which suggest a broader purpose, creating ambiguity about what the tool actually does.

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 mention of when to use this tool versus alternatives, nor any exclusion criteria. The description gives no context about suitable use cases or when another sibling (e.g., normalize-url for normalization, web-fetch for full content) should be preferred.

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