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

With no annotations provided, the description carries the full behavioral burden. 'No disk access' is a useful transparency signal and implies a non-mutating, side-effect-free check, but the description does not disclose what 'looks safe' means, what happens with invalid paths, or what the tool returns.

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, front-loaded sentences with no filler. Every word earns its place, and the core purpose is stated before the key behavioral caveat.

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?

This is a 9-parameter tool with no annotations and no output schema, yet the description only addresses path checking. It omits the role of the other accepted parameters, the return behavior, and the definition of 'safe,' leaving an agent with meaningful uncertainty about how to invoke the tool correctly.

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?

The input schema already provides descriptions for all 9 parameters, so the description does not add much parameter-level meaning. It references 'path' only, while the schema itself documents the rest; this meets the baseline but adds no extra semantic 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 states a specific verb and resource: 'Check whether a path looks safe.' It clearly distinguishes this from sibling URL- and domain-oriented tools by targeting file paths, and 'No disk access' further clarifies it is a syntactic or shape check rather than a filesystem operation.

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 gives no guidance on when to prefer this tool over alternatives such as browser-url-ok, normalize-url, or wiki-title-ok. There is no mention of exclusions, prerequisites, or context in which this tool should be selected.

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