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

With no annotations, the description carries the full burden of explaining behavior. It only states 'No disk access,' which implies a side-effect-free check, but it does not describe what constitutes 'safe,' what the return value looks like, or whether errors are thrown. The behavior is largely opaque.

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 concise: two short sentences with no redundant wording. Every word contributes either to the purpose or to a key behavioral constraint. It is well-structured and easy to parse.

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 has 9 optional parameters and no output schema, the description is far too minimal to be contextually complete. It lacks details about return format, error behavior, parameter interactions, and why unrelated parameters are accepted. An agent would struggle to use this tool correctly based solely on the description.

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 has 100% description coverage for all 9 parameters, so the baseline is 3. However, many parameter descriptions seem unrelated to the tool's stated purpose (e.g., 'city name for a public weather hint', 'IANA timezone name'), and the tool description itself adds no clarification about why these parameters exist or how they relate to checking a path. The schema descriptions are present but confusing.

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 core action: 'Check whether a path looks safe.' It identifies the resource (a path) and the verb (check), and the tool name aligns with that purpose. It is slightly ambiguous what 'looks safe' means, but the intent is understandable.

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 provides no guidance on when to use this tool versus any alternative. With many sibling tools like browser-url-ok, fetch-status, and normalize-url, there is no indication of the appropriate context or selection criteria. 'No disk access' hints at a constraint but does not explain usage scenarios.

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