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

No annotations are present, so the description must carry the full behavioral disclosure. It notes that the body is discarded, but it does not describe behavior for the other parameters, whether the operation is read-only, error handling, or any side effects. The coverage is incomplete relative to the tool's apparent multi-purpose nature.

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 very short and front-loads the primary action, which is efficient. However, the structure does not accommodate the tool's multi-purpose design; it is concise but under-specified, trading completeness for brevity.

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?

With nine parameters, no output schema, and no annotations, the description is grossly inadequate. It explains only the URL-checking behavior and provides no information about the purpose or behavior of the other eight parameters. An agent cannot correctly invoke this tool for any of the other parameter types, making the description nearly useless for full utilization.

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 coverage is 100% with individual parameter descriptions, so the baseline is 3. However, the tool description omits all parameters except the URL-related ones, and even that is implied rather than explicit. This creates a mismatch between the description and the schema's breadth, potentially misleading an agent into thinking only the 'url' parameter matters. The description adds no value beyond the schema and actually contradicts it.

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 action: retrieving HTTP status and content type for a public URL. However, the input schema lists nine parameters, many of which (ref, city, feed, json, path, zone, query) are unrelated to this purpose, indicating the tool actually serves multiple distinct validation functions. The description only covers a subset, leaving the overall purpose ambiguous.

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 sibling tools such as fetch-status, normalize-url, or browser-url-ok. The description does not mention alternatives, exclusions, or conditions, forcing the agent to rely on the tool name and schema alone.

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