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

There are no annotations, so the description must carry the behavioral burden. It discloses the key transformation (query and fragment dropped) but omits whether the tool makes network calls, whether only the url parameter is actually consumed, and what happens with invalid URLs.

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?

Two short, front-loaded sentences with no filler. The first sentence names the output, and the second states a key behavioral constraint.

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 no annotations or output schema, and a confusing nine-parameter schema with zero required fields, the description is too thin. It never states that url is the meaningful input, how the returned origin/host/path are structured, or how to handle invalid input.

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 baseline is 3. The description adds meaning to the url parameter by specifying what normalization does, but it does not clarify how the many other schema properties relate to this tool or which ones should be passed.

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 a specific action and resource: "Return origin, host, and path for a URL." It also adds a defining transformation (query/fragment dropped), which distinguishes it from status-check or fetch tools in spirit, though it does not explicitly name or differentiate siblings.

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 implies use when a caller needs normalized URL components, but it does not state when to use this tool versus status/fetch/shape-check siblings. No when-not guidance is given, and the nine-parameter schema is not addressed.

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