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

With no annotations, the description must carry behavioral disclosure. It does state that no disk access occurs, which is a meaningful safety trait. However, it does not disclose what checks are performed, what constitutes 'safe', or what the return value looks like, leaving significant behavioral uncertainty.

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 a single, front-loaded sentence with no wasted words. It immediately conveys the action and a key safety property, which is excellent conciseness.

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?

For a tool with nine parameters and no output schema, this description is grossly incomplete. It does not explain how the various parameters relate to the 'path' focus, what the output format is, or what 'looks safe' entails. The mismatch between the name/description and the broad schema leaves an agent uncertain about correct invocation.

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?

While the schema covers 100% of parameters with descriptions, the tool description only mentions 'path'. The other eight parameters (url, city, feed, host, json, zone, query) are not explained in relation to the stated purpose, creating confusion about why they exist. The description fails to add meaning that ties the schema together.

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), a resource (path), and a qualifier (looks safe, no disk access). It clearly distinguishes itself from sibling tools that target URLs, domains, or other shapes, and is not a tautology.

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 it is for validating file paths, but it does not explicitly state when to use it over alternatives, nor does it mention any exclusions or prerequisites. The 'no disk access' note hints at a safe validation scenario, but guidance is minimal.

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