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. It reveals only that the body is discarded and that the tool returns status and content type. It does not disclose that many parameters are effectively discarded after validation, what the output format is, or any potential side effects. This is insufficient for a tool with no annotations.

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 concise sentence with no fluff. It is front-loaded with the core purpose and the key caveat about the body. However, given the complexity of nine parameters, the extreme brevity borders on under-specification, though it remains efficient.

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 description is incomplete for a tool with nine parameters and no output schema. It does not explain how the parameters affect the result, what the return format looks like, or how the tool should be used in a workflow. An agent would have to rely solely on the schema, which provides parameter-level detail but no higher-level context about the tool's role. This is a significant gap.

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 input schema has 100% description coverage, so each parameter is individually documented. The tool description adds no parameter-specific information beyond the schema. Since the schema covers all parameters, a baseline of 3 is appropriate; the description does not need to repeat what is already in the schema.

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-resource pair: it returns HTTP status and content type for a public URL, and explicitly notes the body is discarded. This is clear and not a tautology, but it does not differentiate from sibling tools like fetch-status or normalize-url, which may have overlapping purposes.

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?

The description offers no guidance on when to use this tool versus alternatives such as fetch-status or browser-url-ok. It does not mention exclusions, prerequisites, or scenarios that favor this tool. The multiple parameters are not explained in the description, leaving the agent to infer usage from the schema alone.

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