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

With no annotations provided, the description carries full burden. It discloses three normalization behaviors (lowercase host, sort query, drop fragment) but omits other potential behaviors such as handling of invalid URLs, default port removal, or encoding normalization. The description is minimal and leaves significant behavioral gaps.

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-loaded, using a single sentence with parenthetical details. Every word serves a purpose, though it could be slightly more structured to list actions clearly.

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 the tool's simplicity (3 parameters, no output schema, no annotations), the description is incomplete. It does not mention the return value (the normalized URL string), error handling for invalid URLs, or edge cases. The description covers only the basic normalization steps.

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 0%, so the description must compensate. It mentions 'sort query' and 'drop fragment' which map to two parameters, but does not explain their defaults or the semantics of the required 'url' parameter. The description adds minimal value beyond parameter names.

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's purpose: 'Normalize URL (lowercase host, sort query, drop fragment).' It uses a specific verb ('Normalize') and resource ('URL'), and lists explicit actions that distinguish it from siblings like url_parse, url_encode, etc.

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 usage guidelines are provided. The description does not specify when to use this tool over alternatives, nor does it list any prerequisites or exclusions. It simply states what the tool does without contextual guidance.

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