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

With no annotations, the description carries the behavioral burden. It does disclose a meaningful behavioral trait: query and fragment are dropped from the returned URL parts. However, it does not state whether the operation is purely local, whether invalid URLs trigger errors, or whether any input besides url is actually used.

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 two short sentences with no filler. The core output is stated first, and the query/fragment dropping behavior is front-loaded immediately after.

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 adequate for a simple pure function but incomplete given the 9-parameter schema and absent output schema. It does not clearly state that 'url' is the only relevant input, nor does it explain what happens with the many other parameters; the agent could be confused by the presence of 'host' and 'path' as separate parameters.

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 description coverage is 100%, so the schema already documents all 9 parameters. The description adds no parameter-specific meaning beyond implying that the 'url' parameter is the one being normalized; it does not clarify that the other eight parameters appear unrelated or are ignored by this tool.

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 clearly states the tool returns origin, host, and path for a URL, and that query/fragment are dropped. This is a specific verb+resource with enough detail to identify the tool's core purpose, though it does not explicitly distinguish itself from sibling URL-shape tools like domain-shape or browser-url-ok.

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 gives no guidance about when to use this tool versus alternatives, and does not mention any exclusions, prerequisites, or conditions. The agent must infer from the name and sibling context that this is for URL normalization rather than validation or fetching.

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