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

With no annotations, the description carries the transparency burden; 'No disk access' is a useful behavioral constraint that tells an agent the tool won't touch the filesystem. However, it doesn't disclose the return shape, what 'safe' means, whether existence is checked, or error behavior.

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?

Two short sentences with no filler; the primary action is front-loaded and the second sentence carries real information. This is an efficiently structured description, even though it is minimal.

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?

Despite a fairly rich input schema and no output schema or annotations, the description is far too brief to explain how a 9-parameter schema maps to a 'path' check, whether more than one parameter can be passed, or what the return value is. An agent cannot confidently invoke this tool from the description alone.

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 input schema already documents every parameter and the baseline is 3. The description adds no parameter-level detail beyond calling out 'path' and doesn't clarify how the other eight schema properties relate to the 'path' check.

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 names a specific action and resource ('check whether a path looks safe') and adds a meaningful scoping statement ('No disk access'), which helps distinguish it from URL/title checker siblings. It doesn't explicitly contrast with siblings, and the input schema contains several unrelated parameters (url, city, json), so the purpose statement isn't fully aligned with the full parameter surface.

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 guidance about when to choose this tool over alternatives like browser-url-ok, normalize-url, or validate-json. 'No disk access' hints at a lightweight check but doesn't state prerequisites, exclusions, or a when-not-to-use condition.

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