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 the tool performs no disk access, which is useful and non-obvious. However, it does not explain whether 'safe' means rejecting traversal or absolute paths, what the return value is, or whether input is otherwise read or validated.

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 two short sentences with no filler; the core purpose and the most important safety property are front-loaded. Every word earns its place.

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 optional parameters and no output schema or annotations, this is too thin. The description does not clarify which parameter should be passed, what 'safe' means, what result the agent should expect, or why the schema exposes unrelated fields like url, city, and json.

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 100%, so the baseline is 3; the description adds no parameter semantics beyond naming 'path', while the schema already documents each of the nine optional properties, including path.

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 uses a specific verb ('check') and resource ('path') and adds a defining boundary ('No disk access'). It distinguishes this from sibling URL/title/key-shape tools, though 'looks safe' leaves the exact validation criteria unspecified.

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?

There is no explicit when-to-use guidance or comparison to siblings such as browser-url-ok or wiki-title-ok. 'No disk access' implies it is a pure shape check rather than a filesystem probe, but the description does not say when to choose it over alternatives.

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