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

No annotations are provided, so the description must carry the full burden. It only discloses that no browser is launched, but gives no information about side effects, network activity, error behavior, or how the diverse parameters are processed. The mention of 'shape check' in the schema is unexplained.

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 extremely brief (one sentence), which is concise, but it omits essential context needed for correct usage. Being short is not conciseness when critical information is missing.

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 nine parameters, no output schema, and no annotations, the description is grossly incomplete. It fails to explain the tool's actual functionality, how parameters interact, what the result format is, or any prerequisites. An agent would not know how to call this tool correctly.

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?

The schema descriptions are complete (100% coverage) and self-explanatory for each parameter, so the description adds no extra meaning. However, the tool description implies a single URL-focused purpose that conflicts with the unrelated parameters, making the parameter semantics confusing rather than helpful.

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 specific action ('Check whether a URL can be opened'), but the input schema includes nine parameters (city, feed, json, path, zone, query, etc.) that have no obvious connection to URL checking. The tool's actual scope is ambiguous—either it does more than the description claims or the schema is misleading.

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 siblings like browser-url-ok, normalize-url, or fetch-status. The description offers no context about selection criteria, exclusions, or alternatives.

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