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

With no annotations, the description must carry behavioral transparency. It usefully discloses that query and fragment are dropped, which is a meaningful transformation. However, it does not explain behavior for invalid URLs, non-HTTPS inputs, or whether the extra schema fields like host, json, and zone are ignored or validated.

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 short and front-loaded with the core purpose. The second sentence adds an important behavior (dropping query and fragment) without waste. However, the conciseness leaves the extra parameters unexplained.

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?

Given no annotations, no output schema, and a schema containing four loosely related parameters, the description is not complete enough. It does not specify the return shape, how the non-URL parameters are handled, or what constraints apply, leaving significant gaps for an agent trying to call the tool reliably.

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%, but the description only addresses URL normalization while the schema exposes four unrelated parameters: url, host, json, and zone. The description does not clarify how host, json, and zone relate to the tool, and their schema descriptions ('Public hostname', 'JSON text to validate', 'IANA timezone name') seem disconnected from normalize-url. This creates ambiguity for the agent.

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 and resource: it normalizes a URL and returns origin, host, and path while dropping query and fragment. It is distinguishable from sibling tools like validate-json or timezone, though it does not explicitly contrast itself with a URL-related sibling.

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 provides no guidance about when to use this tool versus alternatives. It does not mention any conditions, exclusions, or related tools such as citation or domain-shape, leaving the agent to infer usage solely from the tool name.

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