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

With no annotations, the description must carry behavioral disclosure. It does disclose one meaningful non-obvious trait: 'No disk access', which tells the agent this is a side-effect-free, local-only check. But it is silent on what the return value is, what 'safe' means, or how it handles the nine unrelated-looking optional parameters, leaving a significant transparency gap.

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, each earning its place: the first identifies the purpose, the second adds a key constraint. The description is front-loaded and free of filler, making it easy to scan.

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 9-parameter tool with no output schema and no annotations, the description is too sparse. An agent cannot tell whether it returns a boolean, error, or report, or what path shapes count as 'safe'. The presence of many unrelated parameters in the schema compounds the incompleteness.

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 each parameter already has a description; the tool description adds no parameter detail beyond the word 'path'. This meets the baseline for high schema coverage but does not elevate it, and it fails to clarify why the schema also contains url, city, feed, etc., which could confuse an agent.

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 clear action ('Check') and resource ('a path'), and adds the constraint 'No disk access', which signals a lightweight static validation. However, it does not define what 'safe' means, and it doesn't explicitly differentiate from sibling 'ok' tools like browser-url-ok or wiki-title-ok, beyond the path/disk mention.

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 on when to use this tool versus alternatives such as normalize-url or browser-url-ok. The 'No disk access' hint implies it is a pure syntactic pre-check, but the description never states that explicitly as a usage condition, nor lists any exclusions.

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