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

With no annotations, the description carries the full burden of behavioral disclosure. It does reveal that query and fragment are dropped, but it does not disclose that the tool also accepts and discards many unrelated parameters (ref, city, feed, etc.) or what happens when multiple params are provided. The schema's per-param notes about 'discarded' are not reflected in the main description, so the actual behavior is opaque and potentially misleading.

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 only two sentences, front-loading the core action (return origin, host, path) and a key behavioral trait (drop query/fragment). It is concise and to the point, with no wasted words. However, the brevity contributes to the under-specification of the tool's actual scope.

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 tool has 9 parameters and no output schema, yet the description only explains URL normalization. It does not clarify why parameters like city, feed, json, and zone exist, or what the tool does with them. An agent cannot fully understand the tool's behavior or invoke it correctly for non-URL inputs. The description is incomplete for the actual complexity of the schema.

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%, so all parameters are described. The description adds minimal semantic value by specifying that 'url' is normalized and that query/fragment are dropped, but it does not explain how the other parameters relate to the tool's purpose. Given the high schema coverage, a baseline of 3 is appropriate; the description does not fully compensate for the mismatch between its narrow purpose and the broad 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 clearly states the tool returns origin, host, and path for a URL and drops query/fragment. However, it does not mention the other seven parameters in the schema (ref, city, feed, json, path, zone, query), creating ambiguity about the tool's actual scope. It also doesn't distinguish itself from sibling tools like browser-url-ok or fetch-status.

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 guidance is provided on when to use this tool versus alternatives. The description does not mention any use cases, exclusions, or alternative tool names. An agent would have no basis to choose this over similar URL-related tools.

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