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

With no annotations provided, the description carries the burden and does add a key behavioral fact: no disk access occurs, meaning the operation is a pure shape check with no side effects. It does not explain what 'safe' means, what conditions cause failure, or what the tool returns, but for a simple predicate-style check the disclosure is acceptable.

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 core purpose is front-loaded and the 'No disk access' sentence adds meaningful safety context. 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?

The tool is simple, but with no output schema and no annotations, the description should at least specify the return contract and define what 'safe' means. The schema lists nine parameters while only one is clearly relevant, and the description does not resolve that ambiguity or provide enough context for an agent to confidently use the tool among many similar siblings.

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 even though the description adds no parameter-specific detail beyond echoing the word 'path.' The description also does not clarify why the schema contains many unrelated parameters, which limits its value beyond the schema.

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'), names the resource ('a path'), and adds the useful qualifier 'looks safe' plus 'No disk access.' It is clearly not a tautology and conveys that this is a validation/safety check rather than a filesystem operation. It does not explicitly differentiate from sibling shape-checking tools, but the file-path focus is reasonably distinct.

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 phrase 'No disk access' implies this tool is appropriate when only a syntactic/safety check is needed and filesystem interaction must be avoided. However, the description does not state when to use this tool over alternatives like browser-url-ok or normalize-url, nor does it provide exclusions or explicit routing guidance.

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